GOLDEN STAR RESOURCES LTD. (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 0001000 - Document - DOCUMENT AND ENTITY INFORMATION Document Network

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2 Implied Table Table

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3 Document And Entity Information [Abstract] Abstract gss:DocumentAndEntityInformationAbstract
4 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
5 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
6 Document Type Concept (Submission Type) For Period dei:DocumentType
7 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
8 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
9 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
10 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
11 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
12 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
13 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
14 Entity Common Stock, Shares Outstanding Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
15 1001000 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS)/INCOME Network

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16 Implied Table Table

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17 Profit or loss [abstract] Abstract ifrs-full:IncomeStatementAbstract
18 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
19 Cost of sales excluding depreciation and amortization Concept (Monetary) For Period Debit gss:CostOfSalesExcludingDepreciationDepletionAndAmortization1
20 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
21 Mine operating margin Concept (Monetary) For Period Credit ifrs-full:GrossProfit
22 Other expenses/(income) Abstract gss:OtherIncomeExpenseAbstract
23 Exploration expense Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
24 General and administrative Concept (Monetary) For Period Debit gss:GeneralAndAdministrativeExpense1
25 Finance expense, net Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
26 Other income Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
27 Gain on fair value of financial instruments, net Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss
28 Loss on conversion of 7% Convertible Debentures, net Concept (Monetary) For Period Credit ifrs-full:GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid
29 (Loss)/income before tax Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
30 Deferred income tax expense/(recovery) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
31 Net (loss)/income and comprehensive (loss)/income Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
32 Comprehensive income/(loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
33 Net (loss)/income attributable to non-controlling interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
34 Net (loss)/income attributable to Golden Star shareholders Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
35 Net (loss)/income per share attributable to Golden Star shareholders Abstract ifrs-full:EarningsPerShareAbstract
36 Basic (usd per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
37 Diluted (usd per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
38 Weighted average shares outstanding-basic (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
39 Weighted average shares outstanding-diluted (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
40 1001001 - Statement - CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS)/INCOME (Parenthetical) Network

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41 Disclosure of detailed information about borrowings [table] Table

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42 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
43 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
44 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
45 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
46 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
47 1002000 - Statement - CONSOLIDATED BALANCE SHEETS Network

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48 Disclosure of classes of share capital [table] Table

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49 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
50 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
51 First preferred shares, without par value, unlimited shares authorized. No shares issued and outstanding Member ifrs-full:PreferenceSharesMember
52 Common shares, without par value, unlimited shares authorized Member ifrs-full:OrdinarySharesMember
53 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
54 ASSETS Abstract ifrs-full:AssetsAbstract
55 CURRENT ASSETS Abstract ifrs-full:CurrentAssetsAbstract
56 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
57 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:TradeAndOtherCurrentReceivables
58 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
59 Prepaids and other Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaymentsAndCurrentAccruedIncome
60 Total Current Assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
61 RESTRICTED CASH Concept (Monetary) As Of Debit ifrs-full:NoncurrentRestrictedCashAndCashEquivalents
62 MINING INTERESTS Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
63 DEFERRED TAX ASSETS Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
64 Total Assets Concept (Monetary) As Of Debit ifrs-full:Assets
65 LIABILITIES Abstract ifrs-full:LiabilitiesAbstract
66 CURRENT LIABILITIES Abstract ifrs-full:CurrentLiabilitiesAbstract
67 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
68 Current portion of rehabilitation provisions Concept (Monetary) As Of Credit ifrs-full:ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts
69 Current portion of deferred revenue Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
70 Current portion of long term debt Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
71 Current portion of other liability Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
72 Total Current Liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
73 REHABILITATION PROVISIONS Concept (Monetary) As Of Credit ifrs-full:LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts
74 DEFERRED REVENUE Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
75 LONG TERM DEBT Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
76 DERIVATIVE LIABILITY Concept (Monetary) As Of Credit ifrs-full:NoncurrentDerivativeFinancialLiabilities
77 OTHER LIABILITY Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
78 Total Liabilities Concept (Monetary) As Of Credit ifrs-full:Liabilities
79 SHAREHOLDERS' EQUITY Abstract ifrs-full:EquityAbstract
80 SHARE CAPITAL Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
81 CONTRIBUTED SURPLUS Concept (Monetary) As Of Credit ifrs-full:SharePremium
82 DEFICIT Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
83 Shareholders' equity attributable to Golden Star shareholders Concept (Monetary) As Of Credit ifrs-full:EquityAttributableToOwnersOfParent
84 NON-CONTROLLING INTEREST Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
85 Total Equity/(Deficit) Concept (Monetary) As Of Credit ifrs-full:Equity
86 Total Liabilities and Shareholders' Equity Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
87 1002001 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical) Network

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88 Disclosure of classes of share capital [table] Table

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89 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
90 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
91 First preferred shares Member ifrs-full:PreferenceSharesMember
92 Disclosure of classes of share capital [line items] LineItems ifrs-full:DisclosureOfClassesOfShareCapitalLineItems
93 Number of shares issued (shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
94 Number of shares outstanding (shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
95 1003000 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS Network

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96 Disclosure of detailed information about borrowings [table] Table

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97 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
98 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
99 5% Convertible Debentures Member gss:FivePercentConvertibleDebenturesMember
100 Royal Gold loan Member gss:RoyalGoldLoanMember
101 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
102 OPERATING ACTIVITIES: Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
103 Net (loss)/income Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
104 Reconciliation of net (loss)/income to net cash (used in)/provided by operating activities: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
105 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDepreciationAndAmortisationExpense
106 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
107 Deferred income tax expense/(recovery) Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
108 Gain on fair value of 7% Convertible Debentures embedded derivative Concept (Monetary) For Period Credit ifrs-full:AdjustmentsForGainsLossesOnChangeInFairValueOfDerivatives
109 Recognition of deferred revenue Concept (Monetary) For Period Credit gss:DeferredRevenueRevenueRecognized2
110 Proceeds from Royal Gold stream Concept (Monetary) For Period Debit gss:ProceedsOfDeferredRevenue
111 Reclamation expenditures Concept (Monetary) For Period Debit gss:AssetRetirementObligationLiabilitiesSettled1
112 Other Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities
113 Changes in working capital Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
114 Net cash (used in)/provided by operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
115 INVESTING ACTIVITIES: Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
116 Additions to mining properties Concept (Monetary) For Period Credit gss:PurchaseOfMiningProperty
117 Additions to plant and equipment Concept (Monetary) For Period Credit gss:PurchaseOfPlantAndEquipment
118 Additions to construction in progress Concept (Monetary) For Period Credit ifrs-full:PaymentsForDevelopmentProjectExpenditure
119 Proceeds from asset disposal Concept (Monetary) For Period Debit ifrs-full:ProceedsFromSalesOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
120 Change in accounts payable and deposits on mine equipment and material Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInExplorationForAndEvaluationOfMineralResourcesClassifiedAsInvestingActivities
121 Increase in restricted cash Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInDecreaseIncreaseInRestrictedCashAndCashEquivalents
122 Net cash used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
123 FINANCING ACTIVITIES: Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
124 Principal payments on debt Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
125 Proceeds from debt agreements Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
126 Debt repayment Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
127 Shares issued, net Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
128 Exercise of options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
129 Net cash provided by financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
130 Increase in cash and cash equivalents Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
131 Cash and cash equivalents, beginning of period Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
132 Cash and cash equivalents, end of period Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
133 1003001 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Network

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134 Disclosure of detailed information about borrowings [table] Table

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135 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
136 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
137 5% Convertible Debentures Member gss:FivePercentConvertibleDebenturesMember
138 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
139 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
140 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
141 1004000 - Statement - CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Network

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142 Statement of changes in equity [table] Table

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143 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
144 Equity [member] Member ifrs-full:EquityMember
145 Share Capital Member ifrs-full:IssuedCapitalMember
146 Contributed Surplus Member ifrs-full:SharePremiumMember
147 Deficit Member ifrs-full:RetainedEarningsMember
148 Non-Controlling Interest Member ifrs-full:NoncontrollingInterestsMember
149 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
150 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
151 Common shares Member ifrs-full:OrdinarySharesMember
152 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
153 Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance1 Concept (Monetary) As Of Credit gss:StockholdersEquityIncludingPortionAttributabletoNoncontrollingInterestAdjustedBalance1
154 Balance at beginning of period (shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
155 Balance at beginning of period Concept (Monetary) As Of Credit ifrs-full:Equity
156 Impact of adopting IFRS 15 on January 1, 2018 (see Note 3) Concept (Monetary) As Of Credit gss:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1
157 Shares issued (see Note 13) (shares) Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
158 Shares issued (see Note 13) Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
159 Shares issued under DSUs (shares) Concept (Shares) For Period gss:NumberOfDeferredShareUnitsIssued
160 Shares issued under DSUs Concept (Monetary) For Period Credit gss:IncreaseDecreaseThroughIssuanceOfDeferredShareUnitsEquityValue
161 Shares issued under options (shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
162 Shares issued under options Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
163 Shares issued under warrants (see Note 13) (shares) Concept (Shares) For Period gss:IncreaseDecreaseInNumberOfSharesOutstandingThroughExerciseOfWarrantsEquity
164 Shares issued under warrants (see Note 13) Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfWarrantsEquity
165 Options granted net of forfeitures Concept (Monetary) For Period Credit gss:ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodValue
166 Deferred share units granted Concept (Monetary) For Period Credit gss:ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredShareUnitsGrantedValue
167 Performance and restricted share units granted Concept (Monetary) For Period Credit gss:ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceAndRestrictedShareUnitsGrantedValue
168 Share issue costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
169 Net (loss)/income Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
170 Balance at end of period (shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
171 Balance at end of period Concept (Monetary) As Of Credit ifrs-full:Equity
172 2101100 - Disclosure - NATURE OF OPERATIONS Network

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173 Implied Table Table

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174 Basis Of Consolidation [Abstract] Abstract gss:BasisOfConsolidationAbstract
175 NATURE OF OPERATIONS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfConsolidationExplanatory
176 2104100 - Disclosure - BASIS OF PRESENTATION Network

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177 Implied Table Table

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178 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract gss:CorporateInformationAndStatementOfIFRSComplianceAbstract
179 BASIS OF PRESENTATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBasisOfPreparationOfFinancialStatementsExplanatory
180 2107100 - Disclosure - SUMMARY OF ACCOUNTING POLICIES Network

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181 Implied Table Table

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182 Significant Accounting Policies [Abstract] Abstract gss:SignificantAccountingPoliciesAbstract
183 SUMMARY OF ACCOUNTING POLICIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
184 2110100 - Disclosure - CRITICAL ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS Network

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185 Implied Table Table

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186 Accounting Policies, Changes In Accounting Estimates And Errors [Abstract] Abstract gss:AccountingPoliciesChangesInAccountingEstimatesAndErrorsAbstract
187 CRITICAL ACCOUNTING JUDGEMENTS, ESTIMATES AND ASSUMPTIONS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccountingJudgementsAndEstimatesExplanatory
188 2113100 - Disclosure - FINANCIAL INSTRUMENTS Network

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189 Implied Table Table

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190 Financial Instruments [Abstract] Abstract gss:FinancialInstrumentsAbstract
191 FINANCIAL INSTRUMENTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsExplanatory
192 2116100 - Disclosure - INVENTORIES Network

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193 Implied Table Table

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194 Classes of current inventories [abstract] Abstract ifrs-full:ClassesOfInventoriesAbstract
195 INVENTORIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInventoriesExplanatory
196 2119100 - Disclosure - MINING INTERESTS Network

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197 Implied Table Table

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198 Property, plant and equipment [abstract] Abstract ifrs-full:PropertyPlantAndEquipmentAbstract
199 MINING INTERESTS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfPropertyPlantAndEquipmentExplanatory
200 2122100 - Disclosure - INCOME TAXES Network

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201 Implied Table Table

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202 Incomes Taxes [Abstract] Abstract gss:IncomesTaxesAbstract
203 INCOME TAXES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
204 2125100 - Disclosure - ACCOUNTS PAYABLE AND ACCRUED LIABILITIES Network

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205 Implied Table Table

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206 Trade and other current payables [abstract] Abstract ifrs-full:TradeAndOtherCurrentPayablesAbstract
207 ACCOUNTS PAYABLE AND ACCRUED LIABILITIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfAccruedExpensesAndOtherLiabilitiesExplanatory
208 2128100 - Disclosure - REHABILITATION PROVISIONS Network

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209 Implied Table Table

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210 Disclosure of other provisions [abstract] Abstract ifrs-full:DisclosureOfOtherProvisionsAbstract
211 REHABILITATION PROVISIONS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfProvisionsExplanatory
212 2131100 - Disclosure - DEFERRED REVENUE Network

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213 Implied Table Table

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214 Disclosure Of Deferred Revenue [Abstract] Abstract gss:DisclosureOfDeferredRevenueAbstract
215 DEFERRED REVENUE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredIncomeExplanatory
216 2134100 - Disclosure - DEBT Network

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217 Implied Table Table

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218 Disclosure of detailed information about borrowings [abstract] Abstract ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsAbstract
219 DEBT Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfBorrowingsExplanatory
220 2137100 - Disclosure - SHARE CAPITAL Network

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221 Implied Table Table

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222 Share Capital, Reserves And Other Equity Interest [Abstract] Abstract gss:ShareCapitalReservesAndOtherEquityInterestAbstract
223 SHARE CAPITAL Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
224 2140100 - Disclosure - COMMITMENTS AND CONTINGENCIES Network

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225 Implied Table Table

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226 Commitments And Contingencies [Abstract] Abstract gss:CommitmentsAndContingenciesAbstract
227 COMMITMENTS AND CONTINGENCIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsAndContingentLiabilitiesExplanatory
228 2143100 - Disclosure - SHARE-BASED COMPENSATION Network

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229 Implied Table Table

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230 Share-Based Payment Arrangements [Abstract] Abstract gss:ShareBasedPaymentArrangementsAbstract
231 SHARE-BASED COMPENSATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSharebasedPaymentArrangementsExplanatory
232 2146100 - Disclosure - (LOSS)/INCOME PER COMMON SHARE Network

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233 Implied Table Table

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234 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
235 (LOSS)/INCOME PER COMMON SHARE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEarningsPerShareExplanatory
236 2149100 - Disclosure - REVENUE Network

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237 Implied Table Table

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238 Revenue [abstract] Abstract ifrs-full:RevenueAbstract
239 REVENUE Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRevenueExplanatory
240 2152100 - Disclosure - COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION Network

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241 Implied Table Table

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242 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
243 COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCostOfSalesExplanatory
244 2155100 - Disclosure - FINANCE EXPENSE, NET Network

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245 Implied Table Table

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246 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
247 FINANCE EXPENSE, NET Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinanceIncomeExpenseExplanatory
248 2158100 - Disclosure - OTHER INCOME Network

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249 Implied Table Table

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250 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
251 OTHER INCOME Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOtherOperatingIncomeExplanatory
252 2161100 - Disclosure - RELATED PARTY TRANSACTIONS Network

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254 Related Party [Abstract] Abstract gss:RelatedPartyAbstract
255 RELATED PARTY TRANSACTIONS Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
256 2164100 - Disclosure - PRINCIPAL SUBSIDIARIES Network

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258 Interests In Other Entities [Abstract] Abstract gss:InterestsInOtherEntitiesAbstract
259 PRINCIPAL SUBSIDIARIES Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
260 2167100 - Disclosure - SEGMENTED INFORMATION Network

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261 Implied Table Table

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262 Disclosure of operating segments [abstract] Abstract ifrs-full:DisclosureOfOperatingSegmentsAbstract
263 SEGMENTED INFORMATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfEntitysReportableSegmentsExplanatory
264 2170100 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION Network

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265 Implied Table Table

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266 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
267 SUPPLEMENTAL CASH FLOW INFORMATION Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashFlowStatementExplanatory
268 2173100 - Disclosure - FINANCIAL RISK MANAGEMENT Network

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269 Implied Table Table

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527 Gain on fair value of 7% Convertible Debentures embedded derivative Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation
528 Financial liabilities, ending balance Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
529 2416402 - Disclosure - INVENTORIES (Details) Network

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*

 http://www.gsr.com/role/InventoriesDetails
530 Disclosure of detailed information about property, plant and equipment [table] Table

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*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
531 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
532 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
533 Wassa Member gss:WassaMember
534 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
535 Stockpiled ore Concept (Monetary) As Of Debit ifrs-full:CurrentOreStockpiles
536 In-process ore Concept (Monetary) As Of Debit ifrs-full:WorkInProgress
537 Materials and supplies Concept (Monetary) As Of Debit ifrs-full:CurrentRawMaterialsAndCurrentProductionSupplies
538 Finished goods Concept (Monetary) As Of Debit ifrs-full:FinishedGoods
539 Inventories Concept (Monetary) As Of Debit ifrs-full:Inventories
540 Cost of inventories expensed during period Concept (Monetary) For Period Debit ifrs-full:CostOfInventoriesRecognisedAsExpenseDuringPeriod
541 Inventory net realizable value adjustment and write-off Concept (Monetary) For Period ifrs-full:InventoryWritedown2011
542 2419402 - Disclosure - MINING INTERESTS (Details) Network

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*

 http://www.gsr.com/role/MiningInterestsDetails
543 Disclosure of detailed information about property, plant and equipment [table] Table

*

*

 ifrs-full:DisclosureOfPropertyPlantAndEquipmentTable
544 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
545 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
546 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
547 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
548 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
549 Plant and equipment Member ifrs-full:OtherPropertyPlantAndEquipmentMember
550 Mining properties Member ifrs-full:MiningPropertyMember
551 Construction in progress Member ifrs-full:ConstructionInProgressMember
552 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
553 Carrying amount [member] Member ifrs-full:CarryingAmountMember
554 Cost Member ifrs-full:GrossCarryingAmountMember
555 Accumulated depreciation and amortisation [member] Member ifrs-full:AccumulatedDepreciationAndAmortisationMember
556 Disclosure of detailed information about property, plant and equipment [line items] LineItems ifrs-full:DisclosureOfPropertyPlantAndEquipmentLineItems
557 Reconciliation of changes in property, plant and equipment [abstract] Abstract ifrs-full:ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract
558 Beginning balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
559 Additions Concept (Monetary) For Period Debit ifrs-full:AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment
560 Transfers Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseThroughTransfersPropertyPlantAndEquipment
561 Capitalized interest Concept (Monetary) For Period ifrs-full:InterestCostsCapitalised
562 Change in rehabilitation provision estimate Concept (Monetary) For Period Debit gss:IncreaseDecreaseInProvisionForDecommissioningRestorationAndRehabilitationCosts
563 Depreciation and amortization Concept (Monetary) For Period ifrs-full:DepreciationPropertyPlantAndEquipment
564 Disposals and other Concept (Monetary) For Period Credit ifrs-full:DisposalsAndRetirementsPropertyPlantAndEquipment
565 Ending balance Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
566 Equipment under finance leases Concept (Monetary) As Of Debit gss:CapitalLeasesBalanceSheetAssetsByMajorClassNet1
567 General capitalization rate for borrowing costs Concept (Percent) For Period ifrs-full:CapitalisationRateOfBorrowingCostsEligibleForCapitalisation
568 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
569 2422402 - Disclosure - INCOME TAXES - Schedule of Deferred Tax Liabilities (Details) Network

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*

 http://www.gsr.com/role/IncomeTaxesScheduleOfDeferredTaxLiabilitiesDetails
570 Disclosure of temporary difference, unused tax losses and unused tax credits [table] Table

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*

 ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsTable
571 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
572 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
573 Tax losses carried forward Member ifrs-full:UnusedTaxLossesMember
574 Deductible temporary differences relating to provisions Member ifrs-full:OtherTemporaryDifferencesMember
575 Mine property costs Member gss:MinePropertyCostsTemporaryDifferencesMember
576 Disclosure of temporary difference, unused tax losses and unused tax credits [line items] LineItems ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsLineItems
577 Deferred tax assets Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
578 Deferred tax liabilities Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
579 Net deferred tax assets Concept (Monetary) As Of Debit ifrs-full:NetDeferredTaxAssets
580 2422403 - Disclosure - INCOME TAXES - Summary of Deferred Tax Asset Not Recognized (Details) Network

*

*

 http://www.gsr.com/role/IncomeTaxesSummaryOfDeferredTaxAssetNotRecognizedDetails
581 Entity Location [Table] Table

*

*

 dei:EntityLocationTable
582 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
583 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
584 Canada Member country:CA
585 U.S. Member country:US
586 Ghana Member country:GH
587 Entity Location [Line Items] LineItems dei:EntityLocationLineItems
588 Deductible temporary differences Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
589 Tax losses Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
590 Total unrecognized deferred tax assets Concept (Monetary) As Of Debit gss:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCredits
591 2422404 - Disclosure - INCOME TAXES - Income Tax Recovery Components (Details) Network

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*

 http://www.gsr.com/role/IncomeTaxesIncomeTaxRecoveryComponentsDetails
592 Implied Table Table

*

*

 implied:Table
593 Incomes Taxes [Abstract] Abstract gss:IncomesTaxesAbstract
594 Current tax recovery Abstract gss:CurrentTaxRecoveryAbstract
595 Current tax on net earnings Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
596 Recovery of previously unrecognized deferred tax assets Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForCurrentTaxOfPriorPeriod
597 Income tax expense/(recovery) Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncomeAndAdjustmentsForCurrentTaxOfPriorPeriods
598 2422405 - Disclosure - INCOME TAXES - Income Tax Recovery Reconciliation (Details) Network

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*

 http://www.gsr.com/role/IncomeTaxesIncomeTaxRecoveryReconciliationDetails
599 Implied Table Table

*

*

 implied:Table
600 Incomes Taxes [Abstract] Abstract gss:IncomesTaxesAbstract
601 Net (loss)/income before tax Concept (Monetary) For Period Credit ifrs-full:AccountingProfit
602 Statutory tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
603 Tax benefit at statutory rate Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
604 Foreign tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfForeignTaxRates
605 Expired loss carryovers Concept (Monetary) For Period Debit gss:TaxEffectOfExpiredLossCarryover
606 Other Concept (Monetary) For Period Debit gss:TaxEffectOfOtherTaxItems
607 Non taxable/deductible items Concept (Monetary) For Period Debit ifrs-full:TaxEffectOfExpenseNotDeductibleInDeterminingTaxableProfitTaxLoss
608 Change in unrecognized deferred tax assets due to exchange rates Concept (Monetary) For Period Debit gss:TaxEffectFromChangeInExchangeRate
609 Change in unrecognized deferred tax assets Concept (Monetary) For Period Debit gss:TaxEffectOfUnrecognizedDeferredTaxAssets
610 Tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
611 2422406 - Disclosure - INCOME TAXES - Schedule Of Tax Pool And Loss Carryover Expiration (Details) Network

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*

 http://www.gsr.com/role/IncomeTaxesScheduleOfTaxPoolAndLossCarryoverExpirationDetails
612 Entity Location [Table] Table

*

*

 dei:EntityLocationTable
613 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
614 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
615 Canada Member country:CA
616 Ghana Member country:GH
617 Other Member gss:OtherGeographicRegionMember
618 Maturity [axis] Axis ifrs-full:MaturityAxis
619 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
620 2019 Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
621 2020 Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
622 2021 Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
623 2026 Member ifrs-full:LaterThanFiveYearsAndNotLaterThanTenYearsMember
624 2027 Member gss:LaterThanTenYearsAndNotLaterThanElevenYearsMember
625 2028 Member gss:LaterThanElevenYearsAndNotLaterThanTwelveYearsMember
626 2029 Member gss:LaterThanTwelveYearsAndNotLaterThanThirteenYearsMember
627 2030 Member gss:LaterThanThirteenYearsAndNotLaterThanFourteenYearsMember
628 2031 Member gss:LaterThanFourteenYearsAndNotLaterThanFifteenYearsMember
629 2032 Member gss:LaterThanFifteenYearsAndNotLaterThanSixteenYearsMember
630 2033 Member gss:LaterThanSixteenYearsAndNotLaterThanSeventeenYearsMember
631 2034 Member gss:LaterThanSeventeenYearsAndNotLaterThanEighteenYearsMember
632 2025 Member gss:LaterThanEighteenYearsAndNotLaterThanNineteenYearsMember
633 2036 Member gss:LaterThanNineteenYearsAndNotLaterThanTwentyYearsMember
634 2037 Member gss:LaterThanTwentyYearsAndNotLaterThanTwentyOneYearsMember
635 Indefinite Member gss:IndefinitelyMember
636 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
637 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
638 Prestea Member gss:BogosoPresteaMember
639 Wassa Member gss:WassaMember
640 Entity Location [Line Items] LineItems dei:EntityLocationLineItems
641 Deferred tax asset when utilisation is dependent on future taxable profits in excess of profits from reversal of taxable temporary differences and entity has suffered loss in jurisdiction to which deferred tax asset relates Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssetWhenUtilisationIsDependentOnFutureTaxableProfitsInExcessOfProfitsFromReversalOfTaxableTemporaryDifferencesAndEntityHasSufferedLossInJurisdictionToWhichDeferredTaxAssetRelates
642 Tax pool and loss carryover Concept (Monetary) As Of Debit gss:TaxPoolAndLossCarryover
643 2425402 - Disclosure - ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Details) Network

*

*

 http://www.gsr.com/role/AccountsPayableAndAccruedLiabilitiesDetails
644 Implied Table Table

*

*

 implied:Table
645 Trade and other current payables [abstract] Abstract ifrs-full:TradeAndOtherCurrentPayablesAbstract
646 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayablesToTradeSuppliers
647 Accrued liabilities Concept (Monetary) As Of Credit ifrs-full:AccrualsClassifiedAsCurrent
648 Payroll related liabilities Concept (Monetary) As Of Credit ifrs-full:ShorttermEmployeeBenefitsAccruals
649 Total Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
650 2428402 - Disclosure - REHABILITATION PROVISIONS (Details) Network

*

*

 http://www.gsr.com/role/RehabilitationProvisionsDetails
651 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
652 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
653 Other provisions [member] Member ifrs-full:OtherProvisionsMember
654 Provision for decommissioning, restoration and rehabilitation costs Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
655 Segments [axis] Axis ifrs-full:SegmentsAxis
656 Segments [member] Member ifrs-full:SegmentsMember
657 Wassa Member gss:WassaMember
658 Prestea Member gss:BogosoPresteaMember
659 Restructuring Cost And Reserve [Axis] Axis gss:RestructuringCostAndReserve1Axis
660 Restructuring Cost And Reserve1 [Domain] Member gss:RestructuringCostAndReserve1Domain
661 Refractory Operation Member gss:RefractoryOperationMember
662 Non-Refractory Operation Member gss:NonRefractoryOperationMember
663 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
664 Undiscounted future cash needs for rehabilitation Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
665 Discount rate assumption Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse
666 Inflation rate assumption Concept (Percent) As Of gss:InflationRateUsedInCurrentEstimateOfValueInUse
667 Beginning balance Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
668 Accretion of rehabilitation provision Concept (Monetary) For Period Debit gss:AssetRetirementObligationAccretionExpense1
669 Changes in estimates Concept (Monetary) For Period Credit gss:AssetRetirementObligationRevisionOfEstimate1
670 Cost of reclamation work performed Concept (Monetary) For Period Debit gss:AssetRetirementObligationLiabilitiesSettled1
671 Balance at the end of the period Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
672 Current portion Concept (Monetary) As Of Credit ifrs-full:ShorttermProvisionForDecommissioningRestorationAndRehabilitationCosts
673 Long term portion Concept (Monetary) As Of Credit ifrs-full:LongtermProvisionForDecommissioningRestorationAndRehabilitationCosts
674 Total Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
675 2431402 - Disclosure - DEFERRED REVENUE (Details) Network

*

*

 http://www.gsr.com/role/DeferredRevenueDetails
676 Disclosure of disaggregation of revenue from contracts with customers [table] Table

*

*

 ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable
677 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
678 Products and services [member] Member ifrs-full:ProductsAndServicesMember
679 Streaming Agreement Member gss:StreamingAgreementMember
680 Disclosure of disaggregation of revenue from contracts with customers [line items] LineItems ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
681 Cash payment proceeds Concept (Monetary) For Period Credit gss:RevenueCashPaymentProceeds
682 Streaming advance payment amount Concept (Monetary) As Of Debit ifrs-full:CurrentAdvancesToSuppliers
683 Streaming advance payment, additional option Concept (Monetary) As Of Debit gss:StreamingAdvancePaymentAdditionalOption
684 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
685 Production delivery percentage Concept (Pure) For Period gss:ProductionDeliveryPercentage
686 Cash purchase price as a percentage of spot gold Concept (Pure) For Period gss:CashPurchasePriceAsAPercentageOfSpotGold
687 Initial term of contract Concept (xbrli:durationItemType) For Period gss:DeferredIncomeTermOfContract
688 Gold delivered to date through Streaming Agreement (in ounces) Concept (num:massItemType) For Period gss:GoldDeliveredToDateMass
689 Gold sold (in ounces) Concept (num:massItemType) For Period gss:MassOfGoldSold
690 Deferred income, beginning balance Concept (Monetary) As Of Credit ifrs-full:DeferredIncome
691 Impact of adopting IFRS 15 on January 1, 2018 (see Note 3) Concept (Monetary) As Of Credit gss:CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption1
692 Deposits received Concept (Monetary) For Period Credit gss:DeferredRevenueAdditions1
693 Deferred revenue recognized Concept (Monetary) For Period Credit gss:DeferredRevenueRevenueRecognizedIncludingAmortization1
694 Interest on financing component of deferred revenue (see Note 11) Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
695 Deferred income, ending balance Concept (Monetary) As Of Credit ifrs-full:DeferredIncome
696 Current portion Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsCurrent
697 Long term portion Concept (Monetary) As Of Credit ifrs-full:DeferredIncomeClassifiedAsNoncurrent
698 Total Concept (Monetary) As Of Credit ifrs-full:DeferredIncome
699 Deferred revenue recognized Concept (Monetary) For Period Credit gss:DeferredRevenueRevenueRecognized1
700 Deferred revenue amortization Concept (Monetary) For Period Debit gss:DeferredRevenueAmortizationofFinancingComponent1
701 2434402 - Disclosure - DEBT - Schedule of Debt (Details) Network

*

*

 http://www.gsr.com/role/DebtScheduleOfDebtDetails
702 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
703 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
704 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
705 Equipment financing credit facility Member gss:EquipmentFinancingCreditFacilityMember
706 Finance leases Member gss:FinanceLeasesMember
707 Ecobank Loan III Member gss:EcobankLoanIIIMember
708 Ecobank Loan IV Member gss:EcobankLoanIVMember
709 5% Convertible Debentures Member gss:FivePercentConvertibleDebenturesMember
710 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
711 Royal Gold loan Member gss:RoyalGoldLoanMember
712 Vendor agreement Member gss:VendorAgreementMember
713 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
714 Current portion Concept (Monetary) As Of Credit ifrs-full:CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
715 Long term portion Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
716 Total Concept (Monetary) As Of Credit ifrs-full:Borrowings
717 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
718 2434403 - Disclosure - DEBT - Narrative (Details) Network

*

*

 http://www.gsr.com/role/DebtNarrativeDetails
719 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
720 Financial Liabilities By Name [Axis] Axis gss:FinancialLiabilitiesByNameAxis
721 Financial Liabilities By Name [Domain] Member gss:FinancialLiabilitiesByNameDomain
722 7% Convertible Debentures embedded derivative Member gss:SevenPercentConvertibleDebenturesEmbeddedDerivativeMember
723 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
724 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
725 Subsidiaries Member ifrs-full:SubsidiariesMember
726 Range [axis] Axis ifrs-full:RangeAxis
727 Ranges [member] Member ifrs-full:RangesMember
728 Minimum Member ifrs-full:BottomOfRangeMember
729 Maximum Member ifrs-full:TopOfRangeMember
730 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
731 Liabilities [member] Member ifrs-full:LiabilitiesMember
732 Convertible Debentures Member gss:ConvertibleDebenturesMember
733 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
734 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
735 Common shares Member ifrs-full:OrdinarySharesMember
736 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
737 Equity [member] Member ifrs-full:EquityMember
738 Share Capital Member ifrs-full:IssuedCapitalMember
739 Variable Rate1 [Axis] Axis gss:VariableRate1Axis
740 Variable Rate1 [Domain] Member gss:VariableRate1Domain
741 LIBOR Member gss:LondonInterbankOfferedRateMember
742 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
743 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
744 Equipment financing credit facility Member gss:EquipmentFinancingCreditFacilityMember
745 Finance leases Member gss:FinanceLeasesMember
746 Ecobank Loan III Member gss:EcobankLoanIIIMember
747 Ecobank Loan IV Member gss:EcobankLoanIVMember
748 5% Convertible Debentures Member gss:FivePercentConvertibleDebenturesMember
749 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
750 Royal Gold loan Member gss:RoyalGoldLoanMember
751 Vendor agreement Member gss:VendorAgreementMember
752 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
753 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
754 Floating interest rate Member ifrs-full:FloatingInterestRateMember
755 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
756 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
757 Borrowings, term Concept (xbrli:durationItemType) For Period gss:BorrowingsTerm
758 Number of finance leases Concept (Integer) As Of gss:NumberOfFinanceLeases
759 Gross finance lease obligations Concept (Monetary) As Of Credit ifrs-full:GrossFinanceLeaseObligations
760 Notional amount Concept (Monetary) As Of ifrs-full:NotionalAmount
761 Borrowings, adjustment to interest rate basis Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
762 Borrowings, principal payment commencement, period from initial drawdown Concept (xbrli:durationItemType) For Period gss:BorrowingsPrincipalPaymentCommencementPeriodFromInitialDrawdown
763 Borrowings, drawdown period Concept (xbrli:durationItemType) For Period gss:BorrowingsDrawdownPeriod
764 Drawdown amount from debt Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
765 Debt repayments of interest Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
766 Notes and debentures issued Concept (Monetary) As Of Credit ifrs-full:NotesAndDebenturesIssued
767 Investment options, exercise price Concept (Share) For Period invest:InvestmentOptionsExercisePrice
768 Discount rate used in current estimate of value in use Concept (Percent) As Of ifrs-full:DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse
769 Number of trading days, exceeding threshold Concept (xbrli:durationItemType) For Period gss:NumberOfTradingDaysExceedingThreshold
770 Number of trading days, consecutive days Concept (xbrli:durationItemType) For Period gss:NumberOfTradingDaysConsecutiveDays
771 Percentage of conversion price in effect Concept (Percent) As Of gss:PercentageofConversionPriceInEffect
772 Redemption price, percentage of principal Concept (Percent) For Period gss:BorrowingsRedemptionPricePercentage
773 Credit derivative, fair value Concept (Monetary) As Of Debit ifrs-full:CreditDerivativeFairValue
774 Financial Liabilities Concept (Monetary) As Of Credit ifrs-full:FinancialLiabilities
775 Other comprehensive income, net of tax, gains (losses) on revaluation Concept (Monetary) For Period Credit ifrs-full:OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation
776 Gain on conversions Concept (Monetary) For Period Credit gss:GainOnConversionOfDerivatives
777 Conversion of stock, amount Concept (Monetary) For Period Credit gss:DebtConversionConvertedInstrumentAmount2
778 Conversion of 7% Convertible Debentures (shares) Concept (Shares) For Period gss:IncreaseDecreaseInNumberOfSharesOutstandingThroughConversionofConvertibleInstrumentsEquity
779 Convertible debt, conversion ratio Concept (Pure) For Period gss:ConvertibleDebtConversionRatio
780 Borrowings Concept (Monetary) As Of Credit ifrs-full:Borrowings
781 Loss on conversion of 7% Convertible Debentures, net Concept (Monetary) For Period Credit ifrs-full:GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid
782 Conversion make-whole payment Concept (Monetary) For Period Debit gss:ConversionMakeWholePayment
783 Debt interest payments calculation multiple Concept (Pure) As Of gss:BorrowingsInterestPaymentsCalculationMultiple
784 Debt interest payments calculation dividing basis Concept (Pure) As Of gss:BorrowingsInterestPaymentsCalculationDividingBasis
785 Repayments of borrowings, classified as financing activities Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfCurrentBorrowings
786 Current liabilities, financed via vendor agreement Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
787 Vendor agreement, due in next twelve months Concept (Monetary) As Of Credit gss:VendorAgreementDueinNextTwelveMonths
788 Gain on deferral of payables Concept (Monetary) For Period Credit gss:GainOnDeferralOfPayables
789 2434404 - Disclosure - DEBT - Schedule of changes in carrying amount of debt (Details) Network

*

*

 http://www.gsr.com/role/DebtScheduleOfChangesInCarryingAmountOfDebtDetails
790 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
791 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
792 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
793 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
794 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
795 Beginning balance Concept (Monetary) As Of Credit ifrs-full:Borrowings
796 Conversions Concept (Monetary) For Period Debit gss:BorrowingsConversions
797 Accretion of 7% Convertible Debentures discount Concept (Monetary) For Period Credit gss:BorrowingsAccretionOfDebt
798 Balance at the end of the period Concept (Monetary) As Of Credit ifrs-full:Borrowings
799 2434405 - Disclosure - DEBT - Schedule of payments on outstanding debt (Details) Network

*

*

 http://www.gsr.com/role/DebtScheduleOfPaymentsOnOutstandingDebtDetails
800 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
801 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
802 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
803 Equipment financing credit facility Member gss:EquipmentFinancingCreditFacilityMember
804 Finance leases Member gss:FinanceLeasesMember
805 Ecobank Loan III Member gss:EcobankLoanIIIMember
806 Ecobank Loan IV Member gss:EcobankLoanIVMember
807 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
808 Royal Gold loan Member gss:RoyalGoldLoanMember
809 Vendor agreement Member gss:VendorAgreementMember
810 Maturity [axis] Axis ifrs-full:MaturityAxis
811 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
812 Year ending December 31, 2019 Member ifrs-full:NotLaterThanOneYearMember
813 Year ending December 31, 2020 Member ifrs-full:LaterThanOneYearAndNotLaterThanTwoYearsMember
814 Year ending December 31, 2021 Member ifrs-full:LaterThanTwoYearsAndNotLaterThanThreeYearsMember
815 Year ending December 31, 2022 Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFourYearsMember
816 Year ending December 31, 2023 Member ifrs-full:LaterThanFourYearsAndNotLaterThanFiveYearsMember
817 Carrying amount, accumulated depreciation, amortisation and impairment and gross carrying amount [axis] Axis ifrs-full:CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis
818 Carrying amount [member] Member ifrs-full:CarryingAmountMember
819 Principal Member ifrs-full:GrossCarryingAmountMember
820 Interest Member gss:InterestPayableMember
821 Range [axis] Axis ifrs-full:RangeAxis
822 Ranges [member] Member ifrs-full:RangesMember
823 Maximum Member ifrs-full:TopOfRangeMember
824 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
825 Debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
826 Debt mandatory repayments as percentage of excess cash flow for remainder of 2017 Concept (Percent) For Period gss:BorrowingsMandatoryRepaymentsAsPercentageOfExcessCashFlowForRemainderOfFiscalYear
827 Debt mandatory repayments as percentage of excess cash flow beginning 2018 until maturity Concept (Percent) For Period gss:BorrowingsMandatoryRepaymentsAsPercentageOfExcessCashFlowYearTwoThroughMaturity
828 Debt interest payments calculation multiple Concept (Pure) As Of gss:BorrowingsInterestPaymentsCalculationMultiple
829 Debt interest payments calculation dividing basis Concept (Pure) As Of gss:BorrowingsInterestPaymentsCalculationDividingBasis
830 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
831 Debt interest payments calculation basis (in USD per ounce) Concept (Decimal) For Period gss:BorrowingsInterestPaymentsCalculationBasis
832 2437402 - Disclosure - SHARE CAPITAL (Details) Network

*

*

 http://www.gsr.com/role/ShareCapitalDetails
833 Statement of changes in equity [table] Table

*

*

 ifrs-full:StatementOfChangesInEquityTable
834 Classes of share capital [axis] Axis ifrs-full:ClassesOfShareCapitalAxis
835 Share capital [member] Member ifrs-full:ClassesOfShareCapitalMember
836 Common shares Member ifrs-full:OrdinarySharesMember
837 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
838 Equity [member] Member ifrs-full:EquityMember
839 Share Capital Member ifrs-full:IssuedCapitalMember
840 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
841 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
842 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
843 Statement of changes in equity [line items] LineItems ifrs-full:StatementOfChangesInEquityLineItems
844 Issue of equity Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
845 Increase (decrease) in number of ordinary shares issued Concept (Shares) For Period ifrs-full:IncreaseDecreaseInNumberOfOrdinarySharesIssued
846 Reconciliation of number of shares outstanding [abstract] Abstract ifrs-full:ReconciliationOfNumberOfSharesOutstandingAbstract
847 Balance at beginning of period (shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
848 Bought deal (shares) Concept (Shares) For Period gss:DealOfferingSharesIssued
849 Conversion of 7% Convertible Debentures (shares) Concept (Shares) For Period gss:IncreaseDecreaseInNumberOfSharesOutstandingThroughConversionofConvertibleInstrumentsEquity
850 Shares issued under DSUs (shares) Concept (Shares) For Period gss:NumberOfDeferredShareUnitsIssued
851 Shares issued under options (shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
852 Shares issued under warrants (shares) Concept (Shares) For Period gss:IncreaseDecreaseInNumberOfSharesOutstandingThroughExerciseOfWarrantsEquity
853 Balance at end of period (shares) Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
854 Balance at beginning of period Concept (Monetary) As Of Credit ifrs-full:Equity
855 Private placement Concept (Monetary) For Period Credit gss:DealOfferingIssueOfEquity
856 Conversion of 7% Convertible Debentures Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughConversionOfConvertibleInstruments
857 Shares issued under DSUs Concept (Monetary) For Period Credit gss:IncreaseDecreaseThroughIssuanceOfDeferredShareUnitsEquityValue
858 Shares issued under options Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
859 Shares issued under warrants Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfWarrantsEquity
860 Share issue costs Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
861 Balance at end of period Concept (Monetary) As Of Credit ifrs-full:Equity
862 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
863 Percentage of outstanding share capital Concept (Percent) For Period gss:PercentageOfOutstandingShareCapital1
864 2440402 - Disclosure - COMMITMENTS AND CONTINGENCIES - Narrative (Details) Network

*

*

 http://www.gsr.com/role/CommitmentsAndContingenciesNarrativeDetails
865 Disclosure of subsidiaries [table] Table

*

*

 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
866 Range [axis] Axis ifrs-full:RangeAxis
867 Ranges [member] Member ifrs-full:RangesMember
868 Minimum Member ifrs-full:BottomOfRangeMember
869 Maximum Member ifrs-full:TopOfRangeMember
870 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
871 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
872 Wassa Member gss:WassaMember
873 Prestea Member gss:BogosoPresteaMember
874 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
875 Assets to which significant restrictions apply Concept (Monetary) As Of Debit ifrs-full:AssetsToWhichSignificantRestrictionsApply
876 Restricted cash Concept (Monetary) As Of Debit ifrs-full:NoncurrentRestrictedCashAndCashEquivalents
877 Mineral revenue, royalties Concept (Percent) As Of gss:MineralRevenueRoyalties
878 Net smelter return royalty, amount exempt Concept (num:weightItemType) As Of gss:NetSmelterReturnRoyaltyAmountExempt
879 Net smelter return royalty, percentage Concept (Percent) As Of gss:NetSmelterReturnRoyaltyPercentage
880 Net smelter return royalty, threshold per ounce Concept (Decimal) As Of gss:NetSmelterReturnRoyaltyThresholdPerOunce
881 2440403 - Disclosure - COMMITMENTS AND CONTINGENCIES - Operating Leases and Capital Commitments (Details) Network

*

*

 http://www.gsr.com/role/CommitmentsAndContingenciesOperatingLeasesAndCapitalCommitmentsDetails
882 Implied Table Table

*

*

 implied:Table
883 Commitments And Contingencies [Abstract] Abstract gss:CommitmentsAndContingenciesAbstract
884 Less than 1 year Concept (Monetary) As Of Credit gss:OperatingLeasesOfficeRentAndCapitalCommitmentsFutureMinimumPaymentsDueNextTwelveMonths
885 Between 1 and 5 years Concept (Monetary) As Of Credit gss:OperatingLeasesOfficeRentAndCapitalCommitmentsFutureMinimumPaymentsDueInTwoToFiveYears
886 More than 5 years Concept (Monetary) As Of Credit gss:OperatingLeasesOfficeRentAndCapitalCommitmentsFutureMinimumPaymentsDueAfterFiveYears
887 Total Concept (Monetary) As Of Credit gss:OperatingLeasesOfficeRentAndCapitalCommitmentsFutureMinimumPaymentsDueTotal
888 2443402 - Disclosure - SHARE-BASED COMPENSATION - Employee compensation expense (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationEmployeeCompensationExpenseDetails
889 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
890 Income Statement Location1 [Axis] Axis gss:IncomeStatementLocation1Axis
891 Income Statement Location1 [Domain] Member gss:IncomeStatementLocation1Domain
892 General and administrative expense Member gss:GeneralAndAdministrativeExpense1Member
893 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
894 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
895 Share options Member gss:ShareOptionsMember
896 Deferred share units Member gss:DeferredShareUnitsDSUMember
897 Share appreciation rights Member gss:ShareAppreciationRightsSARMember
898 Performance share units Member gss:PerformanceShareUnitsPSUMember
899 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
900 Non-cash employee compensation expense Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
901 2443403 - Disclosure - SHARE-BASED COMPENSATION - Fair value assumptions for share options (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationFairValueAssumptionsForShareOptionsDetails
902 Implied Table Table

*

*

 implied:Table
903 Share-Based Payment Arrangements [Abstract] Abstract gss:ShareBasedPaymentArrangementsAbstract
904 Expected volatility Concept (Percent) For Period ifrs-full:DescriptionOfExpectedVolatilityShareOptionsGranted
905 Risk-free interest rate Concept (Percent) For Period ifrs-full:DescriptionOfRiskFreeInterestRateShareOptionsGranted
906 Expected lives (in years) Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
907 2443404 - Disclosure - SHARE-BASED COMPENSATION - Additional information (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationAdditionalInformationDetails
908 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
909 Income Statement Location1 [Axis] Axis gss:IncomeStatementLocation1Axis
910 Income Statement Location1 [Domain] Member gss:IncomeStatementLocation1Domain
911 General and administrative expense Member gss:GeneralAndAdministrativeExpense1Member
912 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
913 Equity [member] Member ifrs-full:EquityMember
914 Contributed Surplus Member ifrs-full:SharePremiumMember
915 Range [axis] Axis ifrs-full:RangeAxis
916 Ranges [member] Member ifrs-full:RangesMember
917 Minimum Member ifrs-full:BottomOfRangeMember
918 Maximum Member ifrs-full:TopOfRangeMember
919 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
920 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
921 Share options Member gss:ShareOptionsMember
922 Deferred share units Member gss:DeferredShareUnitsDSUMember
923 Share appreciation rights Member gss:ShareAppreciationRightsSARMember
924 Performance share units Member gss:PerformanceShareUnitsPSUMember
925 Performance restricted share units Member gss:PerformanceRestrictedShareUnitsPRSUMember
926 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
927 Number of shares authorised (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesAuthorised
928 Expiration period Concept (xbrli:durationItemType) For Period gss:SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod1
929 Number of shares available for grant (in shares) Concept (Shares) As Of gss:SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofSharesAvailableforGrant1
930 Weighted average fair value per option granted (usd per share) Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
931 Future share-based compensation Concept (Monetary) As Of Debit gss:FutureShareBasedCompensationExpense
932 Unrecognized share-based compensation expense Concept (Monetary) As Of Credit ifrs-full:LiabilitiesFromSharebasedPaymentTransactions2011
933 Share-based compensation expense Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsInWhichGoodsOrServicesReceivedDidNotQualifyForRecognitionAsAssets
934 Award performance adjusting factor Concept (Percent) For Period gss:SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage1
935 Other current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
936 Number of shares issued (in shares) Concept (Shares) As Of ifrs-full:NumberOfSharesIssued
937 Share conversion ratio Concept (Pure) For Period gss:ShareBasedCompensationArrangementByShareBasedPaymentAwardConversionRatio
938 Award requisite service period Concept (xbrli:durationItemType) For Period gss:ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardRequisiteServicePeriod2
939 Performance and restricted share units granted Concept (Monetary) For Period Credit gss:ShareBasedCompensationArrangementByShareBasedPaymentAwardPerformanceAndRestrictedShareUnitsGrantedValue
940 2443405 - Disclosure - SHARE-BASED COMPENSATION - Summary of option activity (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationSummaryOfOptionActivityDetails
941 Implied Table Table

*

*

 implied:Table
942 Share-Based Payment Arrangements [Abstract] Abstract gss:ShareBasedPaymentArrangementsAbstract
943 Options Abstract gss:NumberOfShareOptionsOutstandingRollForward
944 Beginning balance outstanding (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
945 Granted (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
946 Exercised (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExercisedInSharebasedPaymentArrangement
947 Forfeited (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsForfeitedInSharebasedPaymentArrangement
948 Expired (in shares) Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsExpiredInSharebasedPaymentArrangement
949 Ending balance outstanding (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
950 Options exercisable (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
951 Weighted– Average Exercise price ($CAD) Abstract gss:WeightedAverageExercisePriceOfShareOptionsOutstandingAbstract
952 Beginning balance outstanding (in $CAD per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
953 Granted (in $CAD per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
954 Exercised (in $CAD per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisedInSharebasedPaymentArrangement
955 Forfeited (in $CAD per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsForfeitedInSharebasedPaymentArrangement
956 Expired (in $CAD per share) Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsExpiredInSharebasedPaymentArrangement
957 Ending balance outstanding (in $CAD per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
958 Weighted Average Exercise price exercisable (in $CAD per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
959 Weighted– Average Remaining Contractual Term (Years) Abstract ifrs-full:DisclosureOfNumberAndWeightedAverageRemainingContractualLifeOfOutstandingShareOptionsAbstract
960 Beginning balance outstanding Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
961 Granted Concept (Decimal) For Period gss:WeightedAverageRemainingContractualLifeOfOutstandingShareOptionsGrantedInShareBasedPaymentArrangement
962 Exercised Concept (Decimal) For Period gss:WeightedAverageRemainingContractualLifeOfOutstandingShareOptionsExercisedInShareBasedPaymentArrangement
963 Forfeited Concept (Decimal) For Period gss:WeightedAverageRemainingContractualLifeOfOutstandingShareOptionsForfeitedInShareBasedPaymentArrangement
964 Ending balance outstanding Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
965 Weighted Average Remaining Contractual Term exercisable Concept (Decimal) As Of gss:WeightedAverageRemainingContractualLifeOfShareOptionsExercisable
966 2443406 - Disclosure - SHARE-BASED COMPENSATION - Number of options outstanding by strike price (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationNumberOfOptionsOutstandingByStrikePriceDetails
967 Disclosure of range of exercise prices of outstanding share options [table] Table

*

*

 ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsTable
968 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
969 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
970 0.30 to 0.50 Member gss:ExercisePriceRange1Member
971 0.51 to 1.00 Member gss:ExercisePriceRange2Member
972 1.01 to 1.50 Member gss:ExercisePriceRange3Member
973 1.51 to 2.50 Member gss:ExercisePriceRange4Member
974 2.51 to 3.50 Member gss:ExercisePriceRange5Member
975 3.51 to 5.00 Member gss:ExercisePriceRange6Member
976 10.51 to 17.65 Member gss:ExercisePriceRange7Member
977 Range [axis] Axis ifrs-full:RangeAxis
978 Ranges [member] Member ifrs-full:RangesMember
979 Minimum Member ifrs-full:BottomOfRangeMember
980 Maximum Member ifrs-full:TopOfRangeMember
981 Disclosure of range of exercise prices of outstanding share options [line items] LineItems ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsLineItems
982 Exercise price (in Cdn$ per share) Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
983 Options outstanding, Number outstanding (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
984 Options outstanding, Weighted-average remaining contractual life Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
985 Options outstanding, Weighted-average exercise price (in Cdn$ per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
986 Options exercisable, Number outstanding (in shares) Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
987 Options exercisable, Weighted-average exercise price (in Cdn$ per share) Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsExercisableInSharebasedPaymentArrangement
988 2443407 - Disclosure - SHARE-BASED COMPENSATION - Summary of DSU activity (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationSummaryOfDsuActivityDetails
989 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
990 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
991 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
992 Deferred share units Member gss:DeferredShareUnitsDSUMember
993 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
994 Number of units, beginning of period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
995 Grants (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
996 Exercises (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
997 Number of units, end of period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
998 2443408 - Disclosure - SHARE-BASED COMPENSATION - Summary of SAR activity (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationSummaryOfSarActivityDetails
999 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1000 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1001 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1002 Share appreciation rights Member gss:ShareAppreciationRightsSARMember
1003 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1004 Number of units, beginning of period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1005 Grants (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1006 Exercises (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1007 Forfeited (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1008 Number of units, end of period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1009 2443409 - Disclosure - SHARE-BASED COMPENSATION - Summary of PSU and PRSU activity (Details) Network

*

*

 http://www.gsr.com/role/ShareBasedCompensationSummaryOfPsuAndPrsuActivityDetails
1010 Disclosure of terms and conditions of share-based payment arrangement [table] Table

*

*

 ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementTable
1011 Types of share-based payment arrangements [axis] Axis ifrs-full:TypesOfSharebasedPaymentArrangementsAxis
1012 Share-based payment arrangements [member] Member ifrs-full:SharebasedPaymentArrangementsMember
1013 Performance share units Member gss:PerformanceShareUnitsPSUMember
1014 Performance restricted share units Member gss:PerformanceRestrictedShareUnitsPRSUMember
1015 Disclosure of terms and conditions of share-based payment arrangement [line items] LineItems ifrs-full:DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
1016 Number of units, beginning of period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1017 Grants (in shares) Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
1018 Settled (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
1019 Forfeited (in shares) Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
1020 Number of units, end of period (in shares) Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
1021 2446402 - Disclosure - (LOSS)/INCOME PER COMMON SHARE (Details) Network

*

*

 http://www.gsr.com/role/LossIncomePerCommonShareDetails
1022 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
1023 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1024 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1025 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
1026 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1027 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1028 2446402 - Disclosure - (LOSS)/INCOME PER COMMON SHARE (Details) Network

*

*

 http://www.gsr.com/role/LossIncomePerCommonShareDetails
1029 Implied Table Table

*

*

 implied:Table
1030 Earnings per share [abstract] Abstract ifrs-full:EarningsPerShareAbstract
1031 Net (loss)/income attributable to Golden Star shareholders Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntity
1032 Adjustments: Abstract gss:PreferredStockDividendsAndOtherAdjustments1Abstract
1033 Interest expense on 7% Convertible Debentures Concept (Monetary) For Period Credit gss:InterestOnConvertibleDebtNetOfTax1
1034 Accretion of 7% Convertible Debentures discount Concept (Monetary) For Period Credit gss:DeferredAmortizationOnConvertibleDebtNetOfTax
1035 Gain on fair value of 7% Convertible Debentures embedded derivative Concept (Monetary) For Period Credit gss:DilutiveSecuritiesEffectOnBasicEarningsPerShareOther1
1036 Diluted (loss)/income Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOrdinaryEquityHoldersOfParentEntityIncludingDilutiveEffects
1037 Weighted average shares outstanding-basic (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
1038 Dilutive securities: Abstract ifrs-full:WeightedAverageSharesAndAdjustedWeightedAverageSharesAbstract
1039 Options (in shares) Concept (Shares) For Period ifrs-full:DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
1040 Deferred stock units (in shares) Concept (Shares) For Period gss:DilutiveEffectOfDeferredStockUnitsOnNumberOfOrdinaryShares
1041 Performance and restricted share units (in shares) Concept (Shares) For Period gss:DilutiveEffectOfPerformanceandRestrictedShareUnitsOnNumberOfOrdinaryShares
1042 Convertible Debentures (in shares) Concept (Shares) For Period ifrs-full:DilutiveEffectOfConvertibleInstrumentsOnNumberOfOrdinaryShares
1043 Weighted average shares outstanding-diluted (in shares) Concept (Shares) For Period ifrs-full:AdjustedWeightedAverageShares
1044 (Loss)/income per share attributable to Golden Star shareholders: Abstract ifrs-full:BasicAndDilutedEarningsPerShareAbstract
1045 Basic (usd per share) Concept (Share) For Period ifrs-full:BasicEarningsLossPerShare
1046 Diluted (usd per share) Concept (Share) For Period ifrs-full:DilutedEarningsLossPerShare
1047 2449402 - Disclosure - REVENUE (Details) Network

*

*

 http://www.gsr.com/role/RevenueDetails
1048 Disclosure of disaggregation of revenue from contracts with customers [table] Table

*

*

 ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersTable
1049 Products and services [axis] Axis ifrs-full:ProductsAndServicesAxis
1050 Products and services [member] Member ifrs-full:ProductsAndServicesMember
1051 Streaming Agreement Member gss:StreamingAgreementMember
1052 Spot Sales Member gss:SpotSalesMember
1053 Disclosure of disaggregation of revenue from contracts with customers [line items] LineItems ifrs-full:DisclosureOfDisaggregationOfRevenueFromContractsWithCustomersLineItems
1054 Cash payment proceeds Concept (Monetary) For Period Credit gss:RevenueCashPaymentProceeds
1055 Deferred revenue recognized Concept (Monetary) For Period Credit gss:DeferredRevenueRevenueRecognizedIncludingAmortization1
1056 Total revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1057 2452402 - Disclosure - COST OF SALES EXCLUDING DEPRECIATION AND AMORTIZATION (Details) Network

*

*

 http://www.gsr.com/role/CostOfSalesExcludingDepreciationAndAmortizationDetails
1058 Implied Table Table

*

*

 implied:Table
1059 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1060 Contractors Concept (Monetary) For Period Debit gss:OperatingExpensesContractors
1061 Electricity Concept (Monetary) For Period Debit ifrs-full:EnergyExpense
1062 Fuel Concept (Monetary) For Period Debit ifrs-full:FuelExpense
1063 Raw materials and consumables Concept (Monetary) For Period Debit ifrs-full:RawMaterialsAndConsumablesUsed
1064 Salaries and benefits Concept (Monetary) For Period Debit ifrs-full:ShorttermEmployeeBenefitsExpense
1065 Transportation costs Concept (Monetary) For Period Debit ifrs-full:TransportationExpense
1066 General and administrative Concept (Monetary) For Period Debit ifrs-full:SellingGeneralAndAdministrativeExpense
1067 Other Concept (Monetary) For Period Debit ifrs-full:MiscellaneousOtherOperatingExpense
1068 Mine operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
1069 Severance charges Concept (Monetary) For Period Debit ifrs-full:TerminationBenefitsExpense
1070 Operating costs from metal inventory Concept (Monetary) For Period Credit ifrs-full:OtherWorkPerformedByEntityAndCapitalised
1071 Inventory net realizable value adjustment and write-off Concept (Monetary) For Period Debit ifrs-full:WritedownsReversalsOfInventories
1072 Royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
1073 Cost of sales excluding depreciation and amortization Concept (Monetary) For Period Debit gss:CostOfSalesExcludingDepreciationDepletionAndAmortization1
1074 2455402 - Disclosure - FINANCE EXPENSE, NET (Details) Network

*

*

 http://www.gsr.com/role/FinanceExpenseNetDetails
1075 Implied Table Table

*

*

 implied:Table
1076 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1077 Interest income Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
1078 Interest expense, net of capitalized interest (see Note 7) Concept (Monetary) For Period ifrs-full:InterestCostsIncurred
1079 Interest on financing component of deferred revenue (see Note 11) Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
1080 Net foreign exchange gain Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
1081 Accretion of rehabilitation provision Concept (Monetary) For Period Debit gss:AssetRetirementObligationAccretionExpense1
1082 Conversion make-whole payment Concept (Monetary) For Period Debit gss:ConversionMakeWholePayment
1083 Finance expense, net Concept (Monetary) For Period Credit ifrs-full:FinanceIncomeCost
1084 2458402 - Disclosure - OTHER INCOME (Details) Network

*

*

 http://www.gsr.com/role/OtherIncomeDetails
1085 Implied Table Table

*

*

 implied:Table
1086 Analysis of income and expense [abstract] Abstract ifrs-full:AnalysisOfIncomeAndExpenseAbstract
1087 (Gain)/loss on disposal of assets Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfPropertyPlantAndEquipment
1088 Gain on reduction of rehabilitation provisions Concept (Monetary) For Period Credit gss:GainOnReductionOfAssetRetirementObligations
1089 Other income Concept (Monetary) For Period Credit ifrs-full:OtherIncome
1090 Other operating income (expense) Concept (Monetary) For Period Credit ifrs-full:OtherOperatingIncomeExpense
1091 2461402 - Disclosure - RELATED PARTY TRANSACTIONS (Details) Network

*

*

 http://www.gsr.com/role/RelatedPartyTransactionsDetails
1092 Implied Table Table

*

*

 implied:Table
1093 Related Party [Abstract] Abstract gss:RelatedPartyAbstract
1094 Salaries, wages, and other benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
1095 Bonuses Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationOtherLongtermBenefits
1096 Share-based compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
1097 Key management personnel compensation Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
1098 2464402 - Disclosure - PRINCIPAL SUBSIDIARIES (Details) Network

*

*

 http://www.gsr.com/role/PrincipalSubsidiariesDetails
1099 Disclosure of subsidiaries [table] Table

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*

 ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesTable
1100 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
1101 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
1102 Golden Star Limited Member gss:GoldenStarLimitedMember
1103 Wassa Member gss:WassaMember
1104 Prestea Member gss:BogosoPresteaMember
1105 Disclosure of subsidiaries [line items] LineItems ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesLineItems
1106 Proportion of ownership interest in subsidiary Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
1107 Non-controlling interest percentage Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestsHeldByNoncontrollingInterests
1108 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1109 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1110 Current assets (liabilities) Concept (Monetary) As Of Debit ifrs-full:CurrentAssetsLiabilities
1111 Non-current assets Concept (Monetary) As Of Debit ifrs-full:NoncurrentAssets
1112 Non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
1113 Noncurrent Assets (Liabilities) Concept (Monetary) As Of Debit gss:NoncurrentAssetsLiabilities
1114 Net assets/(liabilities) Concept (Monetary) As Of Debit ifrs-full:NetAssetsLiabilities
1115 Non-controlling interest Concept (Monetary) As Of Credit ifrs-full:NoncontrollingInterests
1116 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1117 Net income/(loss) and comprehensive income/(loss) Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
1118 Comprehensive income/(loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
1119 Cash flows provided by/(used in) operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
1120 Cash flows used in investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
1121 Cash flows (used in)/provided by financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
1122 2467402 - Disclosure - SEGMENTED INFORMATION (Details) Network

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*

 http://www.gsr.com/role/SegmentedInformationDetails
1123 Disclosure of operating segments [table] Table

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*

 ifrs-full:DisclosureOfOperatingSegmentsTable
1124 Segment consolidation items [axis] Axis ifrs-full:SegmentConsolidationItemsAxis
1125 Entity's total for segment consolidation items [member] Member ifrs-full:EntitysTotalForSegmentConsolidationItemsMember
1126 Operating segments Member ifrs-full:OperatingSegmentsMember
1127 Corporate Member ifrs-full:UnallocatedAmountsMember
1128 Segments [axis] Axis ifrs-full:SegmentsAxis
1129 Segments [member] Member ifrs-full:SegmentsMember
1130 Wassa Member gss:WassaMember
1131 Prestea Member gss:BogosoPresteaMember
1132 Other Member ifrs-full:AllOtherSegmentsMember
1133 Types of risks [axis] Axis ifrs-full:TypesOfRisksAxis
1134 Risks [member] Member ifrs-full:TypesOfRisksMember
1135 Gold Production, Sale Location Member gss:GoldProductionSaleLocationMember
1136 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
1137 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
1138 South Africa Member gss:ZA1Member
1139 Disclosure of operating segments [line items] LineItems ifrs-full:DisclosureOfOperatingSegmentsLineItems
1140 Revenue Concept (Monetary) For Period Credit ifrs-full:Revenue
1141 Mine operating expenses Concept (Monetary) For Period Debit ifrs-full:OperatingExpense
1142 Severance charges Concept (Monetary) For Period Debit ifrs-full:TerminationBenefitsExpense
1143 Operating costs from metal inventory Concept (Monetary) For Period Credit ifrs-full:OtherWorkPerformedByEntityAndCapitalised
1144 Inventory net realizable value adjustment and write-off Concept (Monetary) For Period Debit ifrs-full:WritedownsReversalsOfInventories
1145 Royalties Concept (Monetary) For Period Debit ifrs-full:RoyaltyExpense
1146 Cost of sales excluding depreciation and amortization Concept (Monetary) For Period Debit gss:CostOfSalesExcludingDepreciationDepletionAndAmortization1
1147 Depreciation and amortization Concept (Monetary) For Period Debit ifrs-full:DepreciationAndAmortisationExpense
1148 Mine operating margin Concept (Monetary) For Period Credit ifrs-full:GrossProfit
1149 Current tax expense (income) Concept (Monetary) For Period Debit ifrs-full:CurrentTaxExpenseIncome
1150 Net income attributable to non-controlling interest Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToNoncontrollingInterests
1151 Net income/(loss) attributable to Golden Star Concept (Monetary) For Period Credit ifrs-full:ProfitLossAttributableToOwnersOfParent
1152 Capital expenditures Concept (Monetary) For Period Debit ifrs-full:AdditionsToNoncurrentAssets
1153 Total assets Concept (Monetary) As Of Debit ifrs-full:Assets
1154 Concentration risk percentage Concept (Percent) For Period gss:ConcentrationRiskPercentage2
1155 2470402 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Narrative (Details) Network

*

*

 http://www.gsr.com/role/SupplementalCashFlowInformationNarrativeDetails
1156 Implied Table Table

*

*

 implied:Table
1157 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
1158 Income taxes paid (refund) Concept (Monetary) For Period Credit ifrs-full:IncomeTaxesPaidRefund
1159 Debt repayments of interest Concept (Monetary) For Period Credit ifrs-full:InterestPaidClassifiedAsFinancingActivities
1160 2470403 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Changes in Working Capital (Details) Network

*

*

 http://www.gsr.com/role/SupplementalCashFlowInformationChangesInWorkingCapitalDetails
1161 Implied Table Table

*

*

 implied:Table
1162 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
1163 Decrease in accounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable
1164 Decrease/(increase) in inventories Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInInventories
1165 Increase in prepaids and other Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInOtherCurrentAssets
1166 Decrease in accounts payable and accrued liabilities Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
1167 Total changes in working capital Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseInWorkingCapital
1168 2470404 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Reconciliation of Other Components (Details) Network

*

*

 http://www.gsr.com/role/SupplementalCashFlowInformationReconciliationOfOtherComponentsDetails
1169 Implied Table Table

*

*

 implied:Table
1170 Statement of cash flows [abstract] Abstract ifrs-full:StatementOfCashFlowsAbstract
1171 (Gain)/loss on disposal of assets Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnDisposalsOfPropertyPlantAndEquipment
1172 Inventory net realizable value adjustment and write-off Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossInventories
1173 Loss on fair value of 5% Convertible Debentures Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFairValueGainsLosses
1174 Gain on fair value of warrants Concept (Monetary) For Period Debit gss:FairValueAdjustmentOfWarrants1
1175 Loss/(gain) on fair value of marketable securities Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
1176 Accretion of vendor agreement Concept (Monetary) For Period Debit gss:AccretionOfVendorAgreement
1177 Accretion of rehabilitation provisions (see Note 10) Concept (Monetary) For Period Debit gss:AssetRetirementObligationAccretionExpense1
1178 Amortization of financing fees Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForInterestExpense
1179 Accretion of 7% Convertible Debentures discount Concept (Monetary) For Period Debit ifrs-full:ExpenseDueToUnwindingOfDiscountOnProvisions
1180 Gain on reduction of rehabilitation provisions Concept (Monetary) For Period Credit gss:GainOnReductionOfAssetRetirementObligations
1181 Loss on conversion of 7% Convertible Debentures, net Concept (Monetary) For Period Credit ifrs-full:GainLossArisingFromDifferenceBetweenCarryingAmountOfFinancialLiabilityExtinguishedAndConsiderationPaid
1182 Gain on warrant exercise Concept (Monetary) For Period Credit gss:GainOnExerciseOfWarrants
1183 Interest on financing component of deferred revenue (see Note 11) Concept (Monetary) For Period Debit ifrs-full:InterestExpenseOnOtherFinancialLiabilities
1184 Other Concept (Monetary) For Period Debit ifrs-full:OtherInflowsOutflowsOfCashClassifiedAsOperatingActivities
1185 2470405 - Disclosure - SUPPLEMENTAL CASH FLOW INFORMATION - Reconciliation by Loan (Details) Network

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*

 http://www.gsr.com/role/SupplementalCashFlowInformationReconciliationByLoanDetails
1186 Disclosure of detailed information about borrowings [table] Table

*

*

 ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsTable
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1188 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1189 Equipment financing credit facility Member gss:EquipmentFinancingCreditFacilityMember
1190 Finance leases Member gss:FinanceLeasesMember
1191 Ecobank Loan III Member gss:EcobankLoanIIIMember
1192 Ecobank Loan IV Member gss:EcobankLoanIVMember
1193 Vendor agreement Member gss:VendorAgreementMember
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1196 Royal Gold loan Member gss:RoyalGoldLoanMember
1197 Disclosure of detailed information about borrowings [line items] LineItems ifrs-full:DisclosureOfDetailedInformationAboutBorrowingsLineItems
1198 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1199 Beginning of period Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1200 Proceeds from debt agreements Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
1201 Principal payments on debt Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBorrowingsClassifiedAsFinancingActivities
1202 Fair value loss on the 5% Convertible Debentures Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFairValueGainsLosses
1203 Repayment Concept (Monetary) For Period Credit ifrs-full:RepaymentsOfBondsNotesAndDebentures
1204 Capitalized loan fee Concept (Monetary) For Period Debit ifrs-full:FeeAndCommissionExpense
1205 New lease Concept (Monetary) For Period Credit ifrs-full:IncreaseThroughNewLeasesLiabilitiesArisingFromFinancingActivities
1206 Conversion of 7% Convertible Debentures Concept (Monetary) For Period Debit gss:BorrowingsConversions
1207 Accretion of debt Concept (Monetary) For Period Credit gss:BorrowingsAccretionOfDebt
1208 End of period Concept (Monetary) As Of Credit ifrs-full:LiabilitiesArisingFromFinancingActivities
1209 2473402 - Disclosure - FINANCIAL RISK MANAGEMENT - Schedule of Contractual Obligations (Details) Network

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*

 http://www.gsr.com/role/FinancialRiskManagementScheduleOfContractualObligationsDetails
1210 Disclosure of financial liabilities [table] Table

*

*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1211 Maturity [axis] Axis ifrs-full:MaturityAxis
1212 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
1213 Less than 1 year Member ifrs-full:NotLaterThanOneYearMember
1214 1 to 3 years Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
1215 3 to 5 years Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
1216 More than 5 years Member ifrs-full:LaterThanFiveYearsMember
1217 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1218 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1219 Convertible Debentures, Finance Leases and Vendor Agreements Member gss:ConvertibleDebenturesFinanceLeasesAndVendorAgreementsMember
1220 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
1221 Classes of other provisions [axis] Axis ifrs-full:ClassesOfProvisionsAxis
1222 Other provisions [member] Member ifrs-full:OtherProvisionsMember
1223 Provision for decommissioning, restoration and rehabilitation costs Member ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
1224 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
1225 Accounts payable and accrued liabilities Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherPayables
1226 Debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1227 Interest on long term debt Concept (Monetary) As Of Credit ifrs-full:InterestPayable
1228 Purchase obligations Concept (Monetary) As Of Credit gss:PurchaseObligation1
1229 Rehabilitation provisions Concept (Monetary) As Of Credit ifrs-full:NonderivativeFinancialLiabilitiesUndiscountedCashFlows
1230 Total Concept (Monetary) As Of Credit gss:ContractualObligation1
1231 Other current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
1232 Borrowings, interest rate Concept (Percent) As Of ifrs-full:BorrowingsInterestRate
1233 Number of trading days, exceeding threshold Concept (xbrli:durationItemType) For Period gss:NumberOfTradingDaysExceedingThreshold
1234 Number of trading days, consecutive days Concept (xbrli:durationItemType) For Period gss:NumberOfTradingDaysConsecutiveDays
1235 Percentage of conversion price in effect Concept (Percent) As Of gss:PercentageofConversionPriceInEffect
1236 2473403 - Disclosure - FINANCIAL RISK MANAGEMENT - Narrative (Details) Network

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*

 http://www.gsr.com/role/FinancialRiskManagementNarrativeDetails
1237 Disclosure of financial liabilities [table] Table

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*

 ifrs-full:DisclosureOfFinancialLiabilitiesTable
1238 Variable Rate1 [Axis] Axis gss:VariableRate1Axis
1239 Variable Rate1 [Domain] Member gss:VariableRate1Domain
1240 LIBOR Member gss:LondonInterbankOfferedRateMember
1241 Types of interest rates [axis] Axis ifrs-full:TypesOfInterestRatesAxis
1242 Interest rate types [member] Member ifrs-full:InterestRateTypesMember
1243 Floating interest rate Member ifrs-full:FloatingInterestRateMember
1244 Range [axis] Axis ifrs-full:RangeAxis
1245 Ranges [member] Member ifrs-full:RangesMember
1246 Maximum Member ifrs-full:TopOfRangeMember
1247 Borrowings by name [axis] Axis ifrs-full:BorrowingsByNameAxis
1248 Borrowings by name [member] Member ifrs-full:BorrowingsByNameMember
1249 7% Convertible Debentures Member gss:SevenPercentConvertibleDebenturesMember
1250 5% Convertible Debentures Member gss:FivePercentConvertibleDebenturesMember
1251 Royal Gold loan Member gss:RoyalGoldLoanMember
1252 Ecobank Loan III Member gss:EcobankLoanIIIMember
1253 Ecobank Loan IV Member gss:EcobankLoanIVMember
1254 Disclosure of financial liabilities [line items] LineItems ifrs-full:DisclosureOfFinancialLiabilitiesLineItems
1255 Current portion of other liability Concept (Monetary) As Of Credit ifrs-full:OtherCurrentLiabilities
1256 Other non-current liabilities Concept (Monetary) As Of Credit ifrs-full:OtherNoncurrentLiabilities
1257 Current assets Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
1258 Current liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentLiabilities
1259 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1260 Proceeds from debt agreements Concept (Monetary) For Period Debit ifrs-full:ProceedsFromBorrowingsClassifiedAsFinancingActivities
1261 Cash payment proceeds Concept (Monetary) For Period Credit gss:RevenueCashPaymentProceeds
1262 Shares issued, net Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
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1264 Debt interest payments calculation multiple Concept (Pure) As Of gss:BorrowingsInterestPaymentsCalculationMultiple
1265 Debt interest payments calculation dividing basis Concept (Pure) As Of gss:BorrowingsInterestPaymentsCalculationDividingBasis
1266 Debt Concept (Monetary) As Of Credit ifrs-full:Borrowings
1267 Projected change in gold price, per ounce Concept (Decimal) For Period gss:ProjectedChangeinGoldPricePerOunce
1268 Projected change in interest charges Concept (Monetary) For Period Debit gss:ChangeinInterestChargesFromSaleofGold
1269 Borrowings, adjustment to interest rate basis Concept (Percent) As Of ifrs-full:BorrowingsAdjustmentToInterestRateBasis
1270 Foreign currency amount Concept (Monetary) As Of invest:InvestmentForeignCurrencyContractForeignCurrencyAmount
1271 Projected change in revenue Concept (Monetary) For Period Credit ifrs-full:RevenueFromSaleOfGold
1272 Projected change in operating cash flows Concept (Monetary) For Period Debit gss:ChangeinOperatingCashFlowsFromSaleofGold
1273 2476402 - Disclosure - CAPITAL RISK MANAGEMENT (Details) Network

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*

 http://www.gsr.com/role/CapitalRiskManagementDetails
1274 Implied Table Table

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*

 implied:Table
1275 Corporate Information And Statement Of IFRS Compliance [Abstract] Abstract gss:CorporateInformationAndStatementOfIFRSComplianceAbstract
1276 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
1277 Long-term debt Concept (Monetary) As Of Credit ifrs-full:LongtermBorrowings
1278 Total equity less long-term debt Concept (Monetary) As Of Credit gss:EquityLessLongtermDebtSurplusDeficit
1279 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
1280 Total equity less long-term debt plus cash and cash equivalents Concept (Monetary) As Of Credit gss:EquityLessLongtermDebtPlusCashandCashEquivalentsSurplusDeficit

*

*