MAG SILVER CORP (SEC Filing Page | XBRL Cloud Viewer | XBRL Instance)

Line Label Object Class Period Type Balance Report ElementName
1 000 - Document - Document And Entity Information Network

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 http://www.magsilver.com/20181231/role/statement-document-and-entity-information
2 Document Information [Table] Table

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 dei:DocumentInformationTable
3 Legal Entity [Axis] Axis dei:LegalEntityAxis
4 Entity [Domain] Member dei:EntityDomain
5 Document Information [Line Items] LineItems dei:DocumentInformationLineItems
6 Entity Registrant Name Concept (Text/String) For Period dei:EntityRegistrantName
7 Entity Central Index Key Concept (CIK Number) For Period dei:EntityCentralIndexKey
8 Trading Symbol Concept (Text/String) For Period dei:TradingSymbol
9 Current Fiscal Year End Date Concept (Month/Day) For Period dei:CurrentFiscalYearEndDate
10 Entity Current Reporting Status Concept (Yes/No) For Period dei:EntityCurrentReportingStatus
11 Entity Emerging Growth Company Concept (Yes/No) For Period dei:EntityEmergingGrowthCompany
12 Entity Common Stock, Shares Outstanding (in shares) Concept (Shares) As Of dei:EntityCommonStockSharesOutstanding
13 Document Type Concept (Submission Type) For Period dei:DocumentType
14 Document Period End Date Concept (Date) For Period dei:DocumentPeriodEndDate
15 Document Fiscal Year Focus Concept (Year) For Period dei:DocumentFiscalYearFocus
16 Document Fiscal Period Focus Concept (Fiscal Period) For Period dei:DocumentFiscalPeriodFocus
17 Amendment Flag Concept (Yes/No) For Period dei:AmendmentFlag
18 001 - Statement - Consolidated Statements of Financial Position Network

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 http://www.magsilver.com/20181231/role/statement-consolidated-statements-of-financial-position
19 Statement Table [Table] Table

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 mag:StatementTable
20 Legal Entity [Axis] Axis dei:LegalEntityAxis
21 Entity [Domain] Member dei:EntityDomain
22 Statement Line Items [Line Items] LineItems mag:StatementLineItems
23 ASSETS Abstract ifrs-full:AssetsAbstract
24 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
25 Accounts receivable Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
26 Prepaid expenses Concept (Monetary) As Of Debit ifrs-full:CurrentPrepaidExpenses
27 TOTAL CURRENT ASSETS Concept (Monetary) As Of Debit ifrs-full:CurrentAssets
28 INVESTMENTS Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssets
29 EQUIPMENT Concept (Monetary) As Of Debit ifrs-full:PropertyPlantAndEquipment
30 INVESTMENT IN ASSOCIATE Concept (Monetary) As Of Debit ifrs-full:InvestmentsInAssociates
31 EXPLORATION AND EVALUATION ASSETS Concept (Monetary) As Of Debit ifrs-full:TangibleExplorationAndEvaluationAssets
32 TOTAL ASSETS Concept (Monetary) As Of Debit ifrs-full:Assets
33 LIABILITIES Abstract ifrs-full:LiabilitiesAbstract
34 Trade and other payables Concept (Monetary) As Of Credit ifrs-full:TradeAndOtherCurrentPayables
35 COMMITMENTS AND CONTINGENCIES Concept (Monetary) As Of Credit ifrs-full:CapitalCommitments
36 DEFERRED INCOME TAXES Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
37 TOTAL LIABILITIES Concept (Monetary) As Of Credit ifrs-full:Liabilities
38 EQUITY Abstract ifrs-full:EquityAbstract
39 Share capital Concept (Monetary) As Of Credit ifrs-full:IssuedCapital
40 Equity reserve Concept (Monetary) As Of Credit ifrs-full:CapitalReserve
41 Accumulated other comprehensive income Concept (Monetary) As Of Credit ifrs-full:AccumulatedOtherComprehensiveIncome
42 Deficit Concept (Monetary) As Of Credit ifrs-full:RetainedEarnings
43 TOTAL EQUITY Concept (Monetary) As Of Credit ifrs-full:Equity
44 TOTAL LIABILITIES AND EQUITY Concept (Monetary) As Of Credit ifrs-full:EquityAndLiabilities
45 002 - Statement - Consolidated Statements of Loss and Comprehensive Loss Network

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 http://www.magsilver.com/20181231/role/statement-consolidated-statements-of-loss-and-comprehensive-loss
46 Statement Table [Table] Table

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 mag:StatementTable
47 Legal Entity [Axis] Axis dei:LegalEntityAxis
48 Entity [Domain] Member dei:EntityDomain
49 Statement Line Items [Line Items] LineItems mag:StatementLineItems
50 EXPENSES Abstract ifrs-full:ExpenseByNatureAbstract
51 Accounting and audit Concept (Monetary) For Period Debit ifrs-full:AuditorsRemuneration
52 Amortization Concept (Monetary) For Period Debit ifrs-full:AmortisationExpense
53 Filing and transfer agent fees Concept (Monetary) For Period Debit mag:FilingAndTransferAgentFees
54 Foreign exchange loss (gain) Concept (Monetary) For Period Debit mag:NetForeignExchangeGainLoss
55 General office expenses Concept (Monetary) For Period Debit ifrs-full:GeneralAndAdministrativeExpense
56 Legal Concept (Monetary) For Period Debit ifrs-full:ProfessionalFeesExpense
57 Management compensation and consulting fees Concept (Monetary) For Period Debit mag:OfficersAndEmployeesSalariesDirectorsFeesAndConsultantFees
58 Mining taxes and other property costs Concept (Monetary) For Period Debit mag:MiningConcessionTaxesAndOtherPropertyCosts
59 Share based payment expense Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
60 Shareholder relations Concept (Monetary) For Period Debit ifrs-full:AdvertisingExpense
61 Travel Concept (Monetary) For Period Debit ifrs-full:TravelExpense
62 Concept (Monetary) For Period Debit ifrs-full:ExpenseByNature
63 INTEREST INCOME Concept (Monetary) For Period Credit ifrs-full:RevenueFromInterest
64 GAIN ON SALE OF EXPLORATION AND EVALUATION ASSETS, NET OF TRANSACTION COSTS Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnAvailableforsaleFinancialAssets
65 CHANGE IN FAIR VALUE OF WARRANTS Concept (Monetary) For Period ifrs-full:ChangesInFairValueOfFinancialAssetsRelatedCreditDerivativesOrSimilarInstruments
66 EQUITY PICK UP FROM ASSOCIATE Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
67 LOSS FOR THE YEAR BEFORE INCOME TAX Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
68 DEFERRED INCOME TAX EXPENSE Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
69 LOSS FOR THE YEAR Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
70 Items that will not be reclassified subsequently to profit or loss: Abstract ifrs-full:ComponentsOfOtherComprehensiveIncomeThatWillBeReclassifiedToProfitOrLossNetOfTaxAbstract
71 UNREALIZED (LOSS) GAIN ON EQUITY SECURITIES, NET OF TAXES Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
72 TOTAL COMPREHENSIVE LOSS Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
73 BASIC AND DILUTED LOSS PER SHARE (in dollars per share) Concept (Share) For Period ifrs-full:BasicAndDilutedEarningsLossPerShare
74 BASIC AND DILUTED (in shares) Concept (Shares) For Period ifrs-full:WeightedAverageShares
75 003 - Statement - Consolidated Statements of Changes in Equity Network

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 http://www.magsilver.com/20181231/role/statement-consolidated-statements-of-changes-in-equity
76 Statement Table [Table] Table

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 mag:StatementTable
77 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
78 Equity [member] Member ifrs-full:EquityMember
79 Issued capital [member] Member ifrs-full:IssuedCapitalMember
80 Reserve of equity [member] Member mag:ReserveOfEquityMember
81 Reserve of exchange differences on translation [member] Member ifrs-full:ReserveOfExchangeDifferencesOnTranslationMember
82 Reserve of gains and losses on remeasuring available-for-sale financial assets [member] Member ifrs-full:ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember
83 Amount recognised in other comprehensive income and accumulated in equity relating to non-current assets or disposal groups held for sale [member] Member ifrs-full:AmountRecognisedInOtherComprehensiveIncomeAndAccumulatedInEquityRelatingToNoncurrentAssetsOrDisposalGroupsHeldForSaleMember
84 Retained earnings [member] Member ifrs-full:RetainedEarningsMember
85 Statement Line Items [Line Items] LineItems mag:StatementLineItems
86 Balance (in shares) Concept (Shares) As Of mag:EquitySharesOutstanding
87 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
88 Stock options exercised (in shares) Concept (Shares) For Period mag:EquityIssuedStockOptionsExercised
89 Stock options exercised Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughExerciseOfOptions
90 Stock options exercised cashless (in shares) Concept (Shares) For Period mag:EquityIssuedStockOptionsExercisedCashless
91 Stock options exercised cashless Concept (Monetary) For Period Credit mag:IncreaseDecreaseThroughExerciseOfOptionsCashlessEquity
92 Restricted and performance share units converted (in shares) Concept (Shares) For Period mag:IncreaseDecreaseThroughRestrictedPerformanceShareUnitsVestedShares
93 Restricted and performance share units converted Concept (Monetary) For Period Credit mag:IncreaseDecreaseThroughRestrictedPerformanceShareUnitsVested
94 Share based payment Concept (Monetary) For Period Credit ifrs-full:IncreaseDecreaseThroughSharebasedPaymentTransactions
95 Issued for cash (in shares) Concept (Shares) For Period mag:EquityIssuedForCash
96 Issued for cash Concept (Monetary) For Period Credit ifrs-full:IssueOfEquity
97 UNREALIZED (LOSS) GAIN ON EQUITY SECURITIES, NET OF TAXES Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsNetOfTax
98 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
99 Total Comprehensive Income (Loss) Concept (Monetary) For Period Credit ifrs-full:ComprehensiveIncome
100 Balance (in shares) Concept (Shares) As Of mag:EquitySharesOutstanding
101 Balance Concept (Monetary) As Of Credit ifrs-full:Equity
102 004 - Statement - Consolidated Statements of Cash Flows Network

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 http://www.magsilver.com/20181231/role/statement-consolidated-statements-of-cash-flows
103 Statement Table [Table] Table

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 mag:StatementTable
104 Legal Entity [Axis] Axis dei:LegalEntityAxis
105 Entity [Domain] Member dei:EntityDomain
106 Statement Line Items [Line Items] LineItems mag:StatementLineItems
107 OPERATING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInOperatingActivitiesAbstract
108 Loss for the year Concept (Monetary) For Period Credit ifrs-full:ProfitLoss
109 Items not involving cash: Abstract ifrs-full:AdjustmentsForReconcileProfitLossAbstract
110 Amortization Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForAmortisationExpense
111 Change in fair value of warrants Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForFairValueGainsLosses
112 Deferred income tax expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDeferredTaxExpense
113 Equity pick up from associate Concept (Monetary) For Period Debit mag:AdjustmentsForPickUpFromAssociate
114 Gain on sale of exploration and evaluation assets, net of transaction costs Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForLossesGainsOnDisposalOfNoncurrentAssets
115 Share based payment expense Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForSharebasedPayments
116 Unrealized foreign exchange loss (gain) Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForUnrealisedForeignExchangeLossesGains
117 Accounts receivable Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForDecreaseIncreaseInTradeAccountReceivable
118 Prepaid expenses Concept (Monetary) For Period Debit mag:AdjustmentsForPrepaidExpenses
119 Trade and other payables Concept (Monetary) For Period Debit ifrs-full:AdjustmentsForIncreaseDecreaseInTradeAndOtherPayables
120 Net cash used in operating activities Concept (Monetary) For Period ifrs-full:CashFlowsFromUsedInOperatingActivities
121 INVESTING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInInvestingActivitiesAbstract
122 Exploration and evaluation expenditures Concept (Monetary) For Period Credit ifrs-full:CashFlowsUsedInExplorationAndDevelopmentActivities
123 Investment in associate Concept (Monetary) For Period Credit ifrs-full:PurchaseOfInterestsInAssociates
124 Investment in equity securities Concept (Monetary) For Period Credit ifrs-full:PurchaseOfFinancialInstrumentsClassifiedAsInvestingActivities
125 Disposition costs from sale of exploration and evaluation assets Concept (Monetary) For Period Credit mag:TransactionCostsOnDisposal
126 Purchase of equipment Concept (Monetary) For Period Credit ifrs-full:PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
127 Redemption of term deposits Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInDecreaseIncreaseInShorttermDepositsAndInvestments
128 Net cash (used in) provided by investing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInInvestingActivities
129 FINANCING ACTIVITIES Abstract ifrs-full:CashFlowsFromUsedInFinancingActivitiesAbstract
130 Issuance of common shares upon exercise of stock options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
131 Issuance of common shares, net of share issue costs Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssueOfOrdinaryShares
132 Net cash provided by financing activities Concept (Monetary) For Period Debit ifrs-full:CashFlowsFromUsedInFinancingActivities
133 EFFECTS OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS Concept (Monetary) For Period Debit ifrs-full:EffectOfExchangeRateChangesOnCashAndCashEquivalents
134 (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS Concept (Monetary) For Period Debit ifrs-full:IncreaseDecreaseInCashAndCashEquivalents
135 CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
136 CASH AND CASH EQUIVALENTS, END OF YEAR Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
137 005 - Disclosure - Note 1 - Nature of Operations Network

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 http://www.magsilver.com/20181231/role/statement-note-1-nature-of-operations
138 Statement Table [Table] Table

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139 Legal Entity [Axis] Axis dei:LegalEntityAxis
140 Entity [Domain] Member dei:EntityDomain
141 Statement Line Items [Line Items] LineItems mag:StatementLineItems
142 Disclosure of nature of operations [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfNatureOfOperationsTextBlock
143 006 - Disclosure - Note 2 - Summary of Significant Accounting Policies Network

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 http://www.magsilver.com/20181231/role/statement-note-2-summary-of-significant-accounting-policies
144 Statement Table [Table] Table

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 mag:StatementTable
145 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
146 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
147 Juanicipio Joint Venture [member] Member mag:JuanicipioJointVentureMember
148 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
149 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
150 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
151 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
152 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
153 Common share equivalents [member] Member mag:CommonShareEquivalentsMember
154 Legal Entity [Axis] Axis dei:LegalEntityAxis
155 Entity [Domain] Member dei:EntityDomain
156 Statement Line Items [Line Items] LineItems mag:StatementLineItems
157 Disclosure of significant accounting policies [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSummaryOfSignificantAccountingPoliciesExplanatory
158 007 - Disclosure - Note 3 - Cash and Cash Equivalents Network

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 http://www.magsilver.com/20181231/role/statement-note-3-cash-and-cash-equivalents-
159 Statement Table [Table] Table

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 mag:StatementTable
160 Legal Entity [Axis] Axis dei:LegalEntityAxis
161 Entity [Domain] Member dei:EntityDomain
162 Statement Line Items [Line Items] LineItems mag:StatementLineItems
163 Disclosure of cash and cash equivalents [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCashAndCashEquivalentsExplanatory
164 008 - Disclosure - Note 4 - Accounts Receivable Network

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 http://www.magsilver.com/20181231/role/statement-note-4-accounts-receivable
165 Statement Table [Table] Table

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 mag:StatementTable
166 Legal Entity [Axis] Axis dei:LegalEntityAxis
167 Entity [Domain] Member dei:EntityDomain
168 Statement Line Items [Line Items] LineItems mag:StatementLineItems
169 Disclosure of trade and other receivables [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTradeAndOtherReceivablesExplanatory
170 009 - Disclosure - Note 5 - Investments Network

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 http://www.magsilver.com/20181231/role/statement-note-5-investments
171 Statement Table [Table] Table

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 mag:StatementTable
172 Legal Entity [Axis] Axis dei:LegalEntityAxis
173 Entity [Domain] Member dei:EntityDomain
174 Statement Line Items [Line Items] LineItems mag:StatementLineItems
175 Disclosure of investments other than investments accounted for using equity method [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInvestmentsOtherThanInvestmentsAccountedForUsingEquityMethodExplanatory
176 010 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") Network

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 http://www.magsilver.com/20181231/role/statement-note-6-investments-in-associate-minera-juanicipio-sa-de-cv
177 Statement Table [Table] Table

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 mag:StatementTable
178 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
179 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
180 Juanicipio property [member] Member mag:JuanicipioPropertyMember
181 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
182 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
183 Juanicipio property [member] Member mag:JuanicipioPropertyMember
184 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
185 MAG Silver Corporation [member] Member mag:MagSilverCorporationMember
186 Legal Entity [Axis] Axis dei:LegalEntityAxis
187 Entity [Domain] Member dei:EntityDomain
188 Industrias Penoles, S.A. de C.V. [member] Member mag:IndustriasPeolesSADeCVMember
189 Fresnillo PLC [member] Member mag:FresnilloPLCMember
190 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
191 Counterparties [member] Member ifrs-full:CounterpartiesMember
192 MAG Silver Corporation [member] Member mag:MagSilverCorporationMember
193 Classes of ordinary shares [axis] Axis ifrs-full:ClassesOfOrdinarySharesAxis
194 Ordinary shares [member] Member ifrs-full:OrdinarySharesMember
195 Common shares in tranche one [member] Member mag:CommonSharesInTrancheOneMember
196 Statement Line Items [Line Items] LineItems mag:StatementLineItems
197 Disclosure of interests in associates [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInterestsInAssociatesExplanatory
198 011 - Disclosure - Note 7 - Exploration and Evaluation Assets Network

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 http://www.magsilver.com/20181231/role/statement-note-7-exploration-and-evaluation-assets
199 Statement Table [Table] Table

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 mag:StatementTable
200 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
201 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
202 Prospective land claim package [member] Member mag:ProspectiveLandClaimPackageMember
203 Counterparty Name [Axis] Axis srt:CounterpartyNameAxis
204 Counterparty Name [Domain] Member srt:RepurchaseAgreementCounterpartyNameDomain
205 Defiance Silver Corp [Member] Member mag:DefianceSilverCorpMember
206 Legal Entity [Axis] Axis dei:LegalEntityAxis
207 Entity [Domain] Member dei:EntityDomain
208 Statement Line Items [Line Items] LineItems mag:StatementLineItems
209 Disclosure of exploration and evaluation assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfExplorationAndEvaluationAssetsExplanatory
210 012 - Disclosure - Note 8 - Share Capital Network

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 http://www.magsilver.com/20181231/role/statement-note-8-share-capital
211 Statement Table [Table] Table

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 mag:StatementTable
212 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
213 Equity [member] Member ifrs-full:EquityMember
214 Restricted share units [member] Member mag:RestrictedShareUnitsMember
215 Performance share units [member] Member mag:PerformanceShareUnitsMember
216 Restricted share units and performance share units [member] Member mag:RestrictedShareUnitsAndPerformanceShareUnitsMember
217 Deferred share units under the Deferred Share Unit Plan [member] Member mag:DeferredShareUnitsUnderTheDeferredShareUnitPlanMember
218 Deferred share units granted to directors [member] Member mag:DeferredShareUnitsGrantedToDirectorsMember
219 Deferred share units [member] Member mag:DeferredShareUnitsMember
220 Range [axis] Axis ifrs-full:RangeAxis
221 Ranges [member] Member ifrs-full:RangesMember
222 Top of range [member] Member ifrs-full:TopOfRangeMember
223 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
224 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
225 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
226 Stock options inside of plan [member] Member mag:StockOptionsInsideOfPlanMember
227 Stock options outside of plan [member] Member mag:StockOptionsOutsideOfPlanMember
228 Legal Entity [Axis] Axis dei:LegalEntityAxis
229 Entity [Domain] Member dei:EntityDomain
230 Statement Line Items [Line Items] LineItems mag:StatementLineItems
231 Disclosure of share capital, reserves and other equity interest [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfShareCapitalReservesAndOtherEquityInterestExplanatory
232 013 - Disclosure - Note 9 - Capital Risk Management Network

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 http://www.magsilver.com/20181231/role/statement-note-9-capital-risk-management
233 Statement Table [Table] Table

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234 Legal Entity [Axis] Axis dei:LegalEntityAxis
235 Entity [Domain] Member dei:EntityDomain
236 Statement Line Items [Line Items] LineItems mag:StatementLineItems
237 Disclosure of objectives, policies and processes for managing capital [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalExplanatory
238 014 - Disclosure - Note 10 - Financial Risk Management Network

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 http://www.magsilver.com/20181231/role/statement-note-10-financial-risk-management
239 Statement Table [Table] Table

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 mag:StatementTable
240 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
241 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
242 MEXICO Member country:MX
243 Country of domicile [member] Member ifrs-full:CountryOfDomicileMember
244 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
245 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
246 Minera Juanicipio [member] Member mag:MineraJuanicipioMember
247 Legal Entity [Axis] Axis dei:LegalEntityAxis
248 Entity [Domain] Member dei:EntityDomain
249 Statement Line Items [Line Items] LineItems mag:StatementLineItems
250 Disclosure of financial risk management [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialRiskManagementExplanatory
251 015 - Disclosure - Note 11 - Financial Instruments and Fair Value Disclosures Network

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 http://www.magsilver.com/20181231/role/statement-note-11-financial-instruments-and-fair-value-disclosures
252 Statement Table [Table] Table

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253 Legal Entity [Axis] Axis dei:LegalEntityAxis
254 Entity [Domain] Member dei:EntityDomain
255 Statement Line Items [Line Items] LineItems mag:StatementLineItems
256 Disclosure of fair value of financial instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueOfFinancialInstrumentsExplanatory
257 016 - Disclosure - Note 12 - Segmented Information Network

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 http://www.magsilver.com/20181231/role/statement-note-12-segmented-information
258 Statement Table [Table] Table

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 mag:StatementTable
259 Legal Entity [Axis] Axis dei:LegalEntityAxis
260 Entity [Domain] Member dei:EntityDomain
261 Statement Line Items [Line Items] LineItems mag:StatementLineItems
262 Disclosure of operating segments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfOperatingSegmentsExplanatory
263 017 - Disclosure - Note 13 - Related Party Transactions Network

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 http://www.magsilver.com/20181231/role/statement-note-13-related-party-transactions
264 Statement Table [Table] Table

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 mag:StatementTable
265 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
266 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
267 Cascabel and IMDEX [member] Member mag:CascabelAndIMDEXMember
268 Cascabel [member] Member mag:CascabelMember
269 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
270 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
271 Cinco de Mayo property [member] Member mag:CincoDeMayoPropertyMember
272 Legal Entity [Axis] Axis dei:LegalEntityAxis
273 Entity [Domain] Member dei:EntityDomain
274 Fresnillo PLC [member] Member mag:FresnilloPLCMember
275 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
276 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
277 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
278 MAG Silver Corporation [member] Member mag:MagSilverCorporationMember
279 Statement Line Items [Line Items] LineItems mag:StatementLineItems
280 Disclosure of related party [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRelatedPartyExplanatory
281 018 - Disclosure - Note 14 - Commitments and Contingencies Network

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 http://www.magsilver.com/20181231/role/statement-note-14-commitments-and-contingencies
282 Statement Table [Table] Table

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283 Types of contracts [axis] Axis ifrs-full:TypesOfContractsAxis
284 Types of contracts [member] Member ifrs-full:TypesOfContractsMember
285 Contractual commitments for equipment [member] Member mag:ContractualCommitmentsForEquipmentMember
286 Development contracts [member] Member mag:DevelopmentContractsMember
287 Legal Entity [Axis] Axis dei:LegalEntityAxis
288 Entity [Domain] Member dei:EntityDomain
289 Statement Line Items [Line Items] LineItems mag:StatementLineItems
290 Disclosure of commitments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCommitmentsExplanatory
291 019 - Disclosure - Note 15 - Income Taxes Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes
292 Statement Table [Table] Table

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293 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
294 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
295 Country of domicile [member] Member ifrs-full:CountryOfDomicileMember
296 MEXICO Member country:MX
297 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
298 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
299 Non-capital loss carry forwards [member] Member mag:NoncapitalLossCarryForwardsMember
300 Capital loss carry forwards [member] Member mag:CapitalLossCarryForwardsMember
301 Legal Entity [Axis] Axis dei:LegalEntityAxis
302 Entity [Domain] Member dei:EntityDomain
303 Statement Line Items [Line Items] LineItems mag:StatementLineItems
304 Disclosure of income tax [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfIncomeTaxExplanatory
305 020 - Disclosure - Significant Accounting Policies (Policies) Network

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306 Statement Table [Table] Table

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307 Legal Entity [Axis] Axis dei:LegalEntityAxis
308 Entity [Domain] Member dei:EntityDomain
309 Statement Line Items [Line Items] LineItems mag:StatementLineItems
310 Discloure of Significant Accounting Policies Abstract mag:DisclosureOfSignificantAccountingPoliciesAbstract
311 Statement of IFRS compliance [text block] Concept (Text Block (HTML)) For Period ifrs-full:StatementOfIFRSCompliance
312 Description of initial application of standards or interpretation [text block] Concept (Text Block (HTML)) For Period mag:DescriptionOfInitialApplicationOfStandardsOrInterpretationTextBlock
313 Description of accounting policy for the basis of consolidation [text block] Concept (Text Block (HTML)) For Period mag:DescriptionOfAccountingPolicyForTheBasisOfConsolidationTextBlock
314 Description of accounting policy for investment in associates [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForInvestmentInAssociates
315 Description of accounting policy for the accounting estimates [text block] Concept (Text Block (HTML)) For Period mag:DescriptionOfAccountingPolicyForTheAccountingEstimatesTextBlock
316 Description of accounting policy for critical judgements [text block] Concept (Text Block (HTML)) For Period mag:DescriptionOfAccountingPolicyForCriticalJudgementsTextBlock
317 Description of accounting policy for financial instruments [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFinancialInstrumentsExplanatory
318 Description of accounting policy for determining components of cash and cash equivalents [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyToDetermineComponentsOfCashAndCashEquivalents
319 Description of accounting policy for exploration and evaluation expenditures [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForExplorationAndEvaluationExpenditures
320 Description of accounting policy for property, plant and equipment [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForPropertyPlantAndEquipmentExplanatory
321 Description of accounting policy for deferred income tax [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForDeferredIncomeTaxExplanatory
322 Description of accounting policy for provisions [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForProvisionsExplanatory
323 Description of accounting policy for functional currency [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForFunctionalCurrencyExplanatory
324 Description of accounting policy for foreign currency translation [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForForeignCurrencyTranslationExplanatory
325 Description of accounting policy for earnings per share [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForEarningsPerShareExplanatory
326 Description of accounting policy for share-based payment transactions [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfAccountingPolicyForSharebasedPaymentTransactionsExplanatory
327 Disclosure of expected impact of initial application of new standards or interpretations [text block] Concept (Text Block (HTML)) For Period ifrs-full:DescriptionOfExpectedImpactOfInitialApplicationOfNewStandardsOrInterpretations
328 021 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Tables) Network

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329 Statement Table [Table] Table

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330 Legal Entity [Axis] Axis dei:LegalEntityAxis
331 Entity [Domain] Member dei:EntityDomain
332 Statement Line Items [Line Items] LineItems mag:StatementLineItems
333 Disclosure of detailed information about property, plant and equipment [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDetailedInformationAboutPropertyPlantAndEquipmentExplanatory
334 022 - Disclosure - Note 3 - Cash and Cash Equivalents (Tables) Network

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335 Statement Table [Table] Table

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336 Legal Entity [Axis] Axis dei:LegalEntityAxis
337 Entity [Domain] Member dei:EntityDomain
338 Statement Line Items [Line Items] LineItems mag:StatementLineItems
339 Disclosure of cash, cash equivalents, and term deposits [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfCashCashEquivalentsAndTermDepositsTextBlock
340 023 - Disclosure - Note 4 - Accounts Receivable (Tables) Network

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341 Statement Table [Table] Table

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342 Legal Entity [Axis] Axis dei:LegalEntityAxis
343 Entity [Domain] Member dei:EntityDomain
344 Statement Line Items [Line Items] LineItems mag:StatementLineItems
345 Components of trade and other receivables [text block] Concept (Text Block (HTML)) For Period mag:ComponentsOfTradeAndOtherReceivablesTextBlock
346 024 - Disclosure - Note 5 - Investments (Tables) Network

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347 Statement Table [Table] Table

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348 Legal Entity [Axis] Axis dei:LegalEntityAxis
349 Entity [Domain] Member dei:EntityDomain
350 Statement Line Items [Line Items] LineItems mag:StatementLineItems
351 Disclosure of investments not accounted for using equity method Concept (Text Block (HTML)) For Period mag:DisclosureOfInvestmentsNotAccountedForUsingEquityMethod
352 Disclosure of the available-for-sale movements [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfTheAvailableforsaleMovementsTextBlock
353 Disclosure of financial instruments designated at fair value through profit or loss [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFinancialInstrumentsDesignatedAtFairValueThroughProfitOrLossExplanatory
354 025 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") (Tables) Network

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355 Statement Table [Table] Table

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356 Legal Entity [Axis] Axis dei:LegalEntityAxis
357 Entity [Domain] Member dei:EntityDomain
358 Statement Line Items [Line Items] LineItems mag:StatementLineItems
359 Disclosure of carrying amount of investments in associates [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfCarryingAmountOfInvestmentsInAssociatesTextBlock
360 Disclosure of financial information of investments in associates [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfFinancialInformationOfInvestmentsInAssociatesTextBlock
361 Disclosure of associate operations [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfAssociateOperationsTextBlock
362 026 - Disclosure - Note 7 - Exploration and Evaluation Assets (Tables) Network

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363 Statement Table [Table] Table

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364 Legal Entity [Axis] Axis dei:LegalEntityAxis
365 Entity [Domain] Member dei:EntityDomain
366 Statement Line Items [Line Items] LineItems mag:StatementLineItems
367 Disclosure of the components of exploration and evaluation assets [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfTheComponentsOfExplorationAndEvaluationAssetsTextBlock
368 027 - Disclosure - Note 8 - Share Capital (Tables) Network

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369 Statement Table [Table] Table

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370 Legal Entity [Axis] Axis dei:LegalEntityAxis
371 Entity [Domain] Member dei:EntityDomain
372 Statement Line Items [Line Items] LineItems mag:StatementLineItems
373 Disclosure of number and weighted average exercise prices of share options [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfNumberAndWeightedAverageExercisePricesOfShareOptionsExplanatory
374 Disclosure of range of exercise prices of outstanding share options [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfRangeOfExercisePricesOfOutstandingShareOptionsExplanatory
375 028 - Disclosure - Note 9 - Capital Risk Management (Tables) Network

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376 Statement Table [Table] Table

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377 Legal Entity [Axis] Axis dei:LegalEntityAxis
378 Entity [Domain] Member dei:EntityDomain
379 Statement Line Items [Line Items] LineItems mag:StatementLineItems
380 Disclosure of capital risk management [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfCapitalRiskManagementTextBlock
381 029 - Disclosure - Note 10 - Financial Risk Management (Tables) Network

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382 Statement Table [Table] Table

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383 Legal Entity [Axis] Axis dei:LegalEntityAxis
384 Entity [Domain] Member dei:EntityDomain
385 Statement Line Items [Line Items] LineItems mag:StatementLineItems
386 Disclosure of credit risk exposure [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfCreditRiskExposureExplanatory
387 Disclosure of market risk [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfMarketRiskExplanatory
388 030 - Disclosure - Note 11 - Financial Instruments and Fair Value Disclosures (Tables) Network

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389 Statement Table [Table] Table

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390 Legal Entity [Axis] Axis dei:LegalEntityAxis
391 Entity [Domain] Member dei:EntityDomain
392 Statement Line Items [Line Items] LineItems mag:StatementLineItems
393 Disclosure of fair value measurement of assets [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfFairValueMeasurementOfAssetsExplanatory
394 031 - Disclosure - Note 13 - Related Party Transactions (Tables) Network

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395 Statement Table [Table] Table

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396 Legal Entity [Axis] Axis dei:LegalEntityAxis
397 Entity [Domain] Member dei:EntityDomain
398 Statement Line Items [Line Items] LineItems mag:StatementLineItems
399 Disclosure of expenses Incurred for related parties [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfExpensesIncurredForRelatedPartiesTextBlock
400 Disclosure of subsidiaries [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfSignificantInvestmentsInSubsidiariesExplanatory
401 Disclosure of information about key management personnel [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfInformationAboutKeyManagementPersonnelExplanatory
402 032 - Disclosure - Note 14 - Commitments and Contingencies (Tables) Network

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403 Statement Table [Table] Table

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404 Legal Entity [Axis] Axis dei:LegalEntityAxis
405 Entity [Domain] Member dei:EntityDomain
406 Statement Line Items [Line Items] LineItems mag:StatementLineItems
407 Disclosure of contractual obligation [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfContractualObligationTextBlock
408 033 - Disclosure - Note 15 - Income Taxes (Tables) Network

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409 Statement Table [Table] Table

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410 Legal Entity [Axis] Axis dei:LegalEntityAxis
411 Entity [Domain] Member dei:EntityDomain
412 Statement Line Items [Line Items] LineItems mag:StatementLineItems
413 Description of income taxes recognized in profit or loss [text block] Concept (Text Block (HTML)) For Period mag:DescriptionOfIncomeTaxesRecognizedInProfitOrLossTextBlock
414 Disclosure of income tax expense recovery differences explanatory [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfIncomeTaxExpenseRecoveryDifferencesExplanatoryTextBlock
415 Disclosure of temporary difference, unused tax losses and unused tax credits [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfTemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsExplanatory
416 Disclosure of deferred taxes [text block] Concept (Text Block (HTML)) For Period ifrs-full:DisclosureOfDeferredTaxesExplanatory
417 Disclosure of deductible temporary differences and unused tax credits for which no deferred tax assets explanatory [text block] Concept (Text Block (HTML)) For Period mag:DisclosureOfDeductibleTemporaryDifferencesAndUnusedTaxCreditsForWhichNoDeferredTaxAssetsExplanatoryTextBlock
418 034 - Disclosure - Note 2 - Summary of Significant Accounting Policies (Details Textual) Network

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419 Statement Table [Table] Table

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420 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
421 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
422 Juanicipio Joint Venture [member] Member mag:JuanicipioJointVentureMember
423 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
424 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
425 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
426 Classes of financial assets [axis] Axis ifrs-full:ClassesOfFinancialAssetsAxis
427 Financial assets, class [member] Member ifrs-full:FinancialAssetsMember
428 Common share equivalents [member] Member mag:CommonShareEquivalentsMember
429 Legal Entity [Axis] Axis dei:LegalEntityAxis
430 Entity [Domain] Member dei:EntityDomain
431 Statement Line Items [Line Items] LineItems mag:StatementLineItems
432 Proportion of ownership interest in joint venture Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
433 Total provision for decommissioning, restoration and rehabilitation costs Concept (Monetary) As Of Credit ifrs-full:ProvisionForDecommissioningRestorationAndRehabilitationCosts
434 Antidilutive securities excluded from computation of earnings per share, amount Concept (Shares) For Period mag:AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
435 035 - Disclosure - Note 2 - Summary of Significant Accounting Policies - Amortization and Impairment (Details) Network

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436 Statement Table [Table] Table

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437 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
438 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
439 Computer equipment [member] Member ifrs-full:ComputerEquipmentMember
440 Office equipment [member] Member ifrs-full:OfficeEquipmentMember
441 Legal Entity [Axis] Axis dei:LegalEntityAxis
442 Entity [Domain] Member dei:EntityDomain
443 Statement Line Items [Line Items] LineItems mag:StatementLineItems
444 Amortization Percentage Concept (Percent) As Of mag:AmortizationPercentage
445 036 - Disclosure - Note 3 - Cash, Cash Equivalents - Schedule of Cash, Cash Equivalents and Term Deposits (Details) Network

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446 Statement Table [Table] Table

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447 Range [axis] Axis ifrs-full:RangeAxis
448 Ranges [member] Member ifrs-full:RangesMember
449 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
450 Top of range [member] Member ifrs-full:TopOfRangeMember
451 Legal Entity [Axis] Axis dei:LegalEntityAxis
452 Entity [Domain] Member dei:EntityDomain
453 Statement Line Items [Line Items] LineItems mag:StatementLineItems
454 Cash at bank and on hand, interest rate Concept (Percent) For Period mag:InterestIncomePercentageOfInterestRateForCashAtBankAndOnHand
455 Cash at bank and on hand Concept (Monetary) As Of Debit ifrs-full:Cash
456 Term deposit (less than 90 days) Concept (Percent) For Period mag:InterestIncomePercentageOfInterestRateForShorttermDepositsClassifiedAsCashAndCashEquivalents
457 Term deposit (less than 90 days) Concept (Monetary) As Of Debit ifrs-full:ShorttermDepositsClassifiedAsCashEquivalents
458 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
459 037 - Disclosure - Note 4 - Accounts Receivable - Components of Accounts Receivable (Details) Network

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460 Statement Table [Table] Table

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461 Legal Entity [Axis] Axis dei:LegalEntityAxis
462 Entity [Domain] Member dei:EntityDomain
463 Statement Line Items [Line Items] LineItems mag:StatementLineItems
464 Goods and services tax ("GST") recoverable Concept (Monetary) As Of Debit ifrs-full:CurrentReceivablesFromTaxesOtherThanIncomeTax
465 Mexican value added tax ("IVA") recoverable Concept (Monetary) As Of Debit ifrs-full:CurrentValueAddedTaxReceivables
466 Interest receivable Concept (Monetary) As Of Debit ifrs-full:CurrentInterestReceivable
467 Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
468 038 - Disclosure - Note 5 - Investments (Details Textual) Network

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469 Statement Table [Table] Table

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470 Legal Entity [Axis] Axis dei:LegalEntityAxis
471 Entity [Domain] Member dei:EntityDomain
472 Statement Line Items [Line Items] LineItems mag:StatementLineItems
473 Gains (losses) on remeasuring available-for-sale financial assets, before tax Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsBeforeTax
474 Income tax relating to available-for-sale financial assets of other comprehensive income Concept (Monetary) For Period Debit ifrs-full:IncomeTaxRelatingToAvailableforsaleFinancialAssetsOfOtherComprehensiveIncome
475 Increase (decrease) in fair value of financial assets designated as measured at fair value through profit or loss related credit derivatives or similar instruments Concept (Monetary) For Period ifrs-full:ChangesInFairValueOfFinancialAssetsRelatedCreditDerivativesOrSimilarInstruments
476 039 - Disclosure - Note 5 - Investments - Investments Held (Details) Network

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477 Statement Table [Table] Table

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478 Legal Entity [Axis] Axis dei:LegalEntityAxis
479 Entity [Domain] Member dei:EntityDomain
480 Statement Line Items [Line Items] LineItems mag:StatementLineItems
481 Equity securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
482 Warrants Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss
483 Investments Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssets
484 040 - Disclosure - Note 5 - Investments - Movement in Available-For-Sale (Details) Network

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485 Statement Table [Table] Table

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486 Legal Entity [Axis] Axis dei:LegalEntityAxis
487 Entity [Domain] Member dei:EntityDomain
488 Statement Line Items [Line Items] LineItems mag:StatementLineItems
489 Equity securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
490 Additions (see Note 7), non-current Concept (Monetary) For Period Credit ifrs-full:PurchaseOfAvailableforsaleFinancialAssets
491 Unrealized (loss) gain for the year, non-current Concept (Monetary) For Period Credit ifrs-full:GainsLossesOnRemeasuringAvailableforsaleFinancialAssetsBeforeTax
492 Equity securities Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAvailableforsale
493 Equity securities, current Concept (Monetary) As Of Debit ifrs-full:CurrentFinancialAssetsAvailableforsale
494 041 - Disclosure - Note 5 - Investments - Movements in Warrants (Details) Network

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495 Statement Table [Table] Table

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496 Legal Entity [Axis] Axis dei:LegalEntityAxis
497 Entity [Domain] Member dei:EntityDomain
498 Statement Line Items [Line Items] LineItems mag:StatementLineItems
499 Warrants Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss
500 Additions, non-current Concept (Monetary) For Period Debit ifrs-full:IncreaseThroughOriginationOrPurchaseFinancialAssets
501 Increase (decrease) in fair value of financial assets designated as measured at fair value through profit or loss related credit derivatives or similar instruments Concept (Monetary) For Period ifrs-full:ChangesInFairValueOfFinancialAssetsRelatedCreditDerivativesOrSimilarInstruments
502 Warrants Concept (Monetary) As Of Debit ifrs-full:NoncurrentFinancialAssetsAtFairValueThroughProfitOrLoss
503 042 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") (Details Textual) Network

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504 Statement Table [Table] Table

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505 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
506 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
507 Juanicipio property [member] Member mag:JuanicipioPropertyMember
508 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
509 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
510 Juanicipio property [member] Member mag:JuanicipioPropertyMember
511 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
512 MAG Silver Corporation [member] Member mag:MagSilverCorporationMember
513 Legal Entity [Axis] Axis dei:LegalEntityAxis
514 Entity [Domain] Member dei:EntityDomain
515 Industrias Penoles, S.A. de C.V. [member] Member mag:IndustriasPeolesSADeCVMember
516 Fresnillo PLC [member] Member mag:FresnilloPLCMember
517 Counterparties [axis] Axis ifrs-full:CounterpartiesAxis
518 Counterparties [member] Member ifrs-full:CounterpartiesMember
519 MAG Silver Corporation [member] Member mag:MagSilverCorporationMember
520 Classes of ordinary shares [axis] Axis ifrs-full:ClassesOfOrdinarySharesAxis
521 Ordinary shares [member] Member ifrs-full:OrdinarySharesMember
522 Common shares in tranche one [member] Member mag:CommonSharesInTrancheOneMember
523 Statement Line Items [Line Items] LineItems mag:StatementLineItems
524 Interest in Juanicipio property prior to joint venture agreement Concept (Percent) For Period mag:InterestInJuanicipioPropertyPriorToJointVentureAgreement
525 Proportion of ownership interest in associate Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
526 Expense arising from exploration for and evaluation of mineral resources Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
527 Term of exploration and evaluation of mineral resources Concept (xbrli:durationItemType) For Period mag:TermOfExplorationAndEvaluationOfMineralResources
528 Issue of equity to associate Concept (Monetary) For Period Credit mag:IssueOfEquityToAssociate
529 Number of tranches to buy common shares from an associate Concept (Integer) For Period mag:NumberOfTranchesToBuyCommonSharesFromAnAssociate
530 Proceeds from issuing shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
531 Fresnillo investment in MAG Silver Corp. common shares Concept (Percent) For Period mag:FresnilloInvestmentInMagSilverCorpCommonShares
532 Percentage of loss in an associate during the period Concept (Percent) For Period mag:PercentageOfLossInAnAssociateDuringThePeriod
533 Joint venture direct operating expenses Concept (Monetary) For Period Debit mag:JointVentureDirectOperatingExpenses
534 043 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") - Investment Relating to Interests in Juancipio Property and Minera Juancipio (Details) Network

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535 Statement Table [Table] Table

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536 Legal Entity [Axis] Axis dei:LegalEntityAxis
537 Entity [Domain] Member dei:EntityDomain
538 Statement Line Items [Line Items] LineItems mag:StatementLineItems
539 Joint venture oversight expenditures incurred 100% by MAG Concept (Monetary) For Period Debit mag:JointVentureOversightExpendituresIncurredByEntity
540 Cash contributions to Minera Juanicipio Concept (Monetary) For Period Debit mag:AmountChargedForContributionsToAJointVenture
541 Total for the current year Concept (Monetary) For Period Debit mag:AmountChargedForInterestsInAssociates
542 Equity pick up of current income (loss) for the year Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfContinuingOperationsOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
543 Balance, beginning of year Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
544 Balance, end of year Concept (Monetary) As Of Debit ifrs-full:InvestmentAccountedForUsingEquityMethod
545 044 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") - Investment Relating to Interests in Juancipio Property and Minera Juancipio (Details) (Parentheticals) Network

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546 Statement Table [Table] Table

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547 Legal Entity [Axis] Axis dei:LegalEntityAxis
548 Entity [Domain] Member dei:EntityDomain
549 Statement Line Items [Line Items] LineItems mag:StatementLineItems
550 Joint Venture Expenditures Incurred Percentage Concept (Percent) For Period mag:JointVentureFinancialInformationSummaryIncludingAdjustmentsMadeByMagSilverCorp
551 045 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") - Associate's Financial Position (Details) Network

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552 Statement Table [Table] Table

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553 Legal Entity [Axis] Axis dei:LegalEntityAxis
554 Entity [Domain] Member dei:EntityDomain
555 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
556 Statement Line Items [Line Items] LineItems mag:StatementLineItems
557 Cash and cash equivalents Concept (Monetary) As Of Debit mag:CashAndCashEquivalentsOfAssociatesAndJointVentures
558 IVA and other receivables Concept (Monetary) As Of Debit mag:IvaAndOtherReceivablesOfAssociatesAndJointVentures
559 TOTAL CURRENT ASSETS Concept (Monetary) As Of Debit mag:CurrentAssetsOfAssociatesAndJointVentures
560 Minerals, surface rights, exploration & development expenditures Concept (Monetary) As Of Debit mag:ExplorationAndDevelopmentExpendituresOfAssociatesAndJointVentures
561 TOTAL ASSETS Concept (Monetary) As Of Debit mag:AssetsOfAssociatesAndJointVentures
562 Payables to Peñoles and other vendors Concept (Monetary) As Of Credit mag:TradeAndOtherCurrentPayablesOfAssociatesAndJointVentures
563 Total current liabilities Concept (Monetary) As Of Credit mag:CurrentLiabilitiesOfAssociatesAndJointVentures
564 Provision for reclamation and remediation costs Concept (Monetary) As Of Credit mag:ProvisionForReclamationAndRemediationOfAssociatesAndJointVentures
565 Deferred income tax liability Concept (Monetary) As Of Credit mag:DeferredTaxLiabilityAssetOfAssociatesAndJointVentures
566 Total liabilities Concept (Monetary) As Of Credit mag:LiabilitiesOfAssociatesAndJointVentures
567 Shareholders equity Concept (Monetary) As Of Credit mag:ShareholdersEquityOfAssociatesAndJointVentures
568 TOTAL LIABILITIES Concept (Monetary) As Of Credit mag:LiabilitiesAndEquityOfAssociatesAndJointVentures
569 046 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") - Operations of Associate (Details) Network

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570 Statement Table [Table] Table

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 mag:StatementTable
571 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
572 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
573 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
574 Legal Entity [Axis] Axis dei:LegalEntityAxis
575 Entity [Domain] Member dei:EntityDomain
576 Statement Line Items [Line Items] LineItems mag:StatementLineItems
577 Deferred income tax recovery Concept (Monetary) For Period mag:DeferredTaxExpenseIncomeOfAssociatesAndJointVentures
578 Exchange gain (loss) Concept (Monetary) For Period Debit mag:ForeignExchangeGainLossOfAssociatesAndJointVentures
579 Net income Concept (Monetary) For Period Credit mag:NetIncomeLossOfAssociatesAndJointVentures
580 MAG's 44% equity pick up Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
581 047 - Disclosure - Note 6 - Investments in Associate ("Minera Juanicipio S.A. DE C.V.") - Operations of Associate (Details) (Parentheticals) Network

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582 Statement Table [Table] Table

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 mag:StatementTable
583 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
584 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
585 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
586 Legal Entity [Axis] Axis dei:LegalEntityAxis
587 Entity [Domain] Member dei:EntityDomain
588 Statement Line Items [Line Items] LineItems mag:StatementLineItems
589 Equity pick up Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
590 048 - Disclosure - Note 7 - Exploration and Evaluation Assets (Details Textual) Network

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591 Statement Table [Table] Table

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 mag:StatementTable
592 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
593 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
594 Prospective land claim package [member] Member mag:ProspectiveLandClaimPackageMember
595 Counterparty Name [Axis] Axis srt:CounterpartyNameAxis
596 Counterparty Name [Domain] Member srt:RepurchaseAgreementCounterpartyNameDomain
597 Defiance Silver Corp [Member] Member mag:DefianceSilverCorpMember
598 Legal Entity [Axis] Axis dei:LegalEntityAxis
599 Entity [Domain] Member dei:EntityDomain
600 Statement Line Items [Line Items] LineItems mag:StatementLineItems
601 Percentage of interest acquirable Concept (Percent) As Of mag:PercentageOfInterestAcquirable
602 Option payments commitment during option period, year two Concept (Monetary) As Of Credit mag:OptionPaymentsCommitmentDuringOptionPeriodYearTwo
603 Net Smelter Returns Royalty Percentage Concept (Percent) For Period mag:NetSmelterRoyaltyReturnsPercentage
604 Option payments to earn right, title and interest to property during option period Concept (Monetary) For Period Credit mag:OptionPaymentsToEarnRightTitleAndInterestToPropertyDuringOptionPeriod
605 Option payments commitment during earn-in option agreement period Concept (Monetary) For Period Credit mag:OptionPaymentsCommitmentDuringEarninOptionAgreementPeriod
606 Optional exploration expenditure commitment during earn-in option agreement period Concept (Monetary) For Period Debit mag:OptionalExplorationExpenditureCommitmentDuringEarninOptionAgreementPeriod
607 Earn in option agreement period Concept (xbrli:durationItemType) For Period mag:EarnInOptionAgreementPeriod
608 Firm exploration expenditure commitment during earn-in option agreement period Concept (Monetary) For Period Credit mag:FirmExplorationExpenditureCommitmentDuringEarninOptionAgreementPeriod
609 Trade and payables included in exploration and evaluation assets Concept (Monetary) As Of Debit mag:TradeAndPayablesIncludedInExplorationAndEvaluationAssets
610 Shares consideration for disposal of noncurrent assets Concept (Shares) For Period mag:SharesConsiderationForDisposalOfNoncurrentAssets
611 Fair value of shares consideration for disposal of noncurrent assets Concept (Monetary) For Period Credit mag:FairValueOfSharesConsiderationForDisposalOfNoncurrentAssets
612 Transaction costs on disposal Concept (Monetary) For Period Credit mag:TransactionCostsOnDisposal
613 Option payments commitment during option period, year three Concept (Monetary) As Of Credit mag:OptionPaymentsCommitmentDuringOptionPeriodYearThree
614 Option payments commitment during option period, year four Concept (Monetary) As Of Credit mag:OptionPaymentsCommitmentDuringOptionPeriodYearFour
615 Option payments commitment during option period, year five Concept (Monetary) As Of Credit mag:OptionPaymentsCommitmentDuringOptionPeriodYearFive
616 049 - Disclosure - Note 7 - Exploration and Evaluation Assets - Components of Exploration and Evaluation Assets (Details) Network

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617 Statement Table [Table] Table

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 mag:StatementTable
618 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
619 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
620 Prospective land claim package [member] Member mag:ProspectiveLandClaimPackageMember
621 Legal Entity [Axis] Axis dei:LegalEntityAxis
622 Entity [Domain] Member dei:EntityDomain
623 Statement Line Items [Line Items] LineItems mag:StatementLineItems
624 Acquisition costs of mineral and surface rights Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesAcquisitionCostsOfMineralSurfaceRights
625 Geochemical Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesGeochemical
626 Camp and site costs Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesCampAndSiteCosts
627 Geological consulting Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesEngineering
628 Geophysical Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesGeologicalAndGeophysical
629 Land taxes and government fees Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesLandTaxesAndGovernmentFees
630 Legal, community and other consultation costs Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesLegalCommunityAndOtherConsultationCosts
631 Travel Concept (Monetary) For Period Debit mag:ExpenseArisingFromExplorationForAndEvaluationOfMineralResourcesTravel
632 Total for the year Concept (Monetary) For Period Debit ifrs-full:ExpenseArisingFromExplorationForAndEvaluationOfMineralResources
633 Balance, exploration and evaluation Concept (Monetary) As Of Debit ifrs-full:AssetsArisingFromExplorationForAndEvaluationOfMineralResources
634 Balance, exploration and evaluation Concept (Monetary) As Of Debit ifrs-full:AssetsArisingFromExplorationForAndEvaluationOfMineralResources
635 050 - Disclosure - Note 8 - Share Capital (Details Textual) Network

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636 Statement Table [Table] Table

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 mag:StatementTable
637 Components of equity [axis] Axis ifrs-full:ComponentsOfEquityAxis
638 Equity [member] Member ifrs-full:EquityMember
639 Restricted share units [member] Member mag:RestrictedShareUnitsMember
640 Performance share units [member] Member mag:PerformanceShareUnitsMember
641 Restricted share units and performance share units [member] Member mag:RestrictedShareUnitsAndPerformanceShareUnitsMember
642 Deferred share units under the Deferred Share Unit Plan [member] Member mag:DeferredShareUnitsUnderTheDeferredShareUnitPlanMember
643 Deferred share units granted to directors [member] Member mag:DeferredShareUnitsGrantedToDirectorsMember
644 Deferred share units [member] Member mag:DeferredShareUnitsMember
645 Range [axis] Axis ifrs-full:RangeAxis
646 Ranges [member] Member ifrs-full:RangesMember
647 Top of range [member] Member ifrs-full:TopOfRangeMember
648 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
649 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
650 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
651 Stock options inside of plan [member] Member mag:StockOptionsInsideOfPlanMember
652 Stock options outside of plan [member] Member mag:StockOptionsOutsideOfPlanMember
653 Legal Entity [Axis] Axis dei:LegalEntityAxis
654 Entity [Domain] Member dei:EntityDomain
655 Statement Line Items [Line Items] LineItems mag:StatementLineItems
656 Number of shares outstanding at end of period Concept (Shares) As Of ifrs-full:NumberOfSharesOutstanding
657 Number of shares issued and fully paid Concept (Shares) As Of ifrs-full:NumberOfSharesIssuedAndFullyPaid
658 Shares Issued, Price Per Share Concept (Share) As Of mag:SharesIssuedPricePerShare
659 Proceeds from issuing shares Concept (Monetary) For Period Debit ifrs-full:ProceedsFromIssuingShares
660 Share issue related cost Concept (Monetary) For Period Debit ifrs-full:ShareIssueRelatedCost
661 Net proceeds from issuing shares Concept (Monetary) For Period Debit mag:NetProceedsFromIssuingShares
662 Number of share options exercised for cash in share-based payment arrangement Concept (Decimal) For Period mag:NumberOfShareOptionsExercisedForCashInSharebasedPaymentArrangement
663 Number of share options exercised in share-based payment arrangement, cashless Concept (Decimal) For Period mag:NumberOfShareOptionsExercisedInSharebasedPaymentArrangementCashless
664 Shares issued in lieu of exercise of stock options Concept (Shares) For Period mag:SharesIssuedInLieuOfExerciseOfStockOptions
665 Number of share options cancelled during the period Concept (Shares) For Period mag:NumberOfShareOptionsCancelledDuringThePeriod
666 Proceeds from exercise of options Concept (Monetary) For Period Debit ifrs-full:ProceedsFromExerciseOfOptions
667 Number of other equity instruments exercised or vested in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
668 Stock options issuance limitations, maximum percentage of allowed issuable common shares Concept (Percent) As Of mag:StockOptionsIssuanceLimitationsMaximumPercentageOfAllowedIssuableCommonShares
669 Option life, share options granted Concept (Decimal) For Period ifrs-full:DescriptionOfOptionLifeShareOptionsGranted
670 Number of share options outstanding in share-based payment arrangement at end of period Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
671 Number of share options granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
672 Weighted average fair value at measurement date, share options granted Concept (Monetary) As Of Credit ifrs-full:WeightedAverageFairValueAtMeasurementDateShareOptionsGranted
673 Weighted average share price, share options granted Concept (Monetary) For Period ifrs-full:WeightedAverageSharePriceShareOptionsGranted
674 Designated value of options to be granted in share-based payment arrangement Concept (Monetary) As Of Credit mag:DesignatedValueOfOptionsToBeGrantedInSharebasedPaymentArrangement
675 Expense from share-based payment transactions with employees and consultants Concept (Monetary) For Period Debit mag:ExpenseFromSharebasedPaymentTransactionsWithEmployeesAndConsultants
676 Restricted and performance Units issuance limitations, maximum percentage of allowed issuable common shares Concept (Percent) As Of mag:RestrictedAndPerformanceUnitsIssuanceLimitationsMaximumPercentageOfAllowedIssuableCommonShares
677 Life of restricted share units and performance share units Concept (xbrli:durationItemType) For Period mag:LifeOfRestrictedShareUnitsAndPerformanceShareUnits
678 Number of common shares issuable from a restricted share unit Concept (Shares) For Period mag:NumberOfCommonSharesIssuableFromARestrictedShareUnit
679 Number of other equity instruments granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfInstrumentsOtherEquityInstrumentsGranted
680 Number of other equity instruments outstanding in share-based payment arrangement at end of period Concept (Decimal) As Of ifrs-full:NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
681 Designated value of other equity instruments to be granted in share-based payment arrangement Concept (Monetary) As Of Credit mag:DesignatedValueOfOtherEquityInstrumentsToBeGrantedInSharebasedPaymentArrangement
682 Number of other equity instruments forfeited in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
683 Expense from share-based payment transactions with employees Concept (Monetary) For Period Debit ifrs-full:ExpenseFromSharebasedPaymentTransactionsWithEmployees
684 Number of other equity instruments vested and convertible in share-based payment arrangement Concept (Shares) As Of mag:NumberOfOtherEquityInstrumentsVestedAndConvertibleInSharebasedPaymentArrangement
685 Number of other equity instruments outstanding with vesting conditions subject to a market share price performance factor Concept (Shares) As Of mag:NumberOfOtherEquityInstrumentsOutstandingWithVestingConditionsSubjectToAMarketSharePricePerformanceFactor
686 Performance share unit payout, percentage Concept (Percent) For Period mag:PerformanceShareUnitPayoutPercentage
687 Performance share unit payout, units Concept (Shares) For Period mag:PerformanceShareUnitPayoutUnits
688 Deferred Units issuance limitations, maximum percentage of allowed issuable common shares Concept (Percent) As Of mag:DeferredUnitsIssuanceLimitationsMaximumPercentageOfAllowedIssuableCommonShares
689 Number of instruments other equity instruments granted in lieu of director fees Concept (Shares) As Of mag:NumberOfInstrumentsOtherEquityInstrumentsGrantedInLieuOfDirectorFees
690 Number of common shares issued under the deferred share unit plan prior to termination date Concept (Shares) As Of mag:NumberOfCommonSharesIssuedUnderTheDeferredShareUnitPlanPriorToTerminationDate
691 Common shares issuable under share-based compensation arrangements Concept (Shares) As Of mag:CommonSharesIssuableUnderSharebasedCompensationArrangements
692 Percentage of common shares issuable and common shares issued and outstanding Concept (Percent) As Of mag:PercentageOfCommonSharesIssuableAndCommonSharesIssuedAndOutstanding
693 Number of share based awards available for grant Concept (Shares) As Of mag:NumberOfShareBasedAwardsAvailableForGrant
694 051 - Disclosure - Note - 8 - Share Capital - Option Activity (Details) Network

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695 Statement Table [Table] Table

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 mag:StatementTable
696 Legal Entity [Axis] Axis dei:LegalEntityAxis
697 Entity [Domain] Member dei:EntityDomain
698 Statement Line Items [Line Items] LineItems mag:StatementLineItems
699 Outstanding options, beginning of year Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
700 Number of share options granted in share-based payment arrangement Concept (Decimal) For Period ifrs-full:NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
701 Exercised for cash, options Concept (Decimal) For Period mag:NumberOfShareOptionsExercisedForCashInSharebasedPaymentArrangement
702 Exercised cashless, options Concept (Decimal) For Period mag:NumberOfShareOptionsExercisedInSharebasedPaymentArrangementCashless
703 Outstanding options, end of year Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
704 Outstanding weighted average exercise price, beginning of year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
705 Granted, weighted average exercise price Concept (Monetary) For Period ifrs-full:WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement
706 Exercised for cash, weighted average exercise price Concept (Monetary) For Period mag:WeightedAverageExercisePriceOfShareOptionsExercisedForCashInSharebasedPaymentArrangement
707 Exercised cashless, weighted average exercise price Concept (Monetary) For Period mag:WeightedAverageExercisePriceOfShareOptionsExercisedInACashlessSharebasedPaymentArrangement
708 Outstanding weighted average exercise price, end of year Concept (Monetary) As Of ifrs-full:WeightedAverageExercisePriceOfShareOptionsOutstandingInSharebasedPaymentArrangement
709 052 - Disclosure - Note - 8 - Share Capital - Stock Options Outstanding and Exercisable (Details) Network

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710 Statement Table [Table] Table

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 mag:StatementTable
711 Ranges of exercise prices for outstanding share options [axis] Axis ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsAxis
712 Ranges of exercise prices for outstanding share options [member] Member ifrs-full:RangesOfExercisePricesForOutstandingShareOptionsMember
713 Range one [member] Member mag:RangeOneMember
714 Range two [member] Member mag:RangeTwoMember
715 Range three [member] Member mag:RangeThreeMember
716 Range four [member] Member mag:RangeFourMember
717 Range five [member] Member mag:RangeFiveMember
718 Range six [member] Member mag:RangeSixMember
719 Range seven [member] Member mag:RangeSevenMember
720 Range eight [member] Member mag:RangeEightMember
721 Range nine [member] Member mag:RangeNineMember
722 Range [axis] Axis ifrs-full:RangeAxis
723 Ranges [member] Member ifrs-full:RangesMember
724 Bottom of range [member] Member ifrs-full:BottomOfRangeMember
725 Top of range [member] Member ifrs-full:TopOfRangeMember
726 Legal Entity [Axis] Axis dei:LegalEntityAxis
727 Entity [Domain] Member dei:EntityDomain
728 Statement Line Items [Line Items] LineItems mag:StatementLineItems
729 Exercise price Concept (Monetary) As Of ifrs-full:ExercisePriceOfOutstandingShareOptions
730 Number outstanding Concept (Decimal) As Of ifrs-full:NumberOfOutstandingShareOptions
731 Number exercisable Concept (Decimal) As Of ifrs-full:NumberOfShareOptionsExercisableInSharebasedPaymentArrangement
732 Weighted average remaining contractual life Concept (Decimal) As Of ifrs-full:WeightedAverageRemainingContractualLifeOfOutstandingShareOptions
733 053 - Disclosure - Note 9 - Capital Risk Management (Details Textual) Network

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734 Statement Table [Table] Table

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 mag:StatementTable
735 Legal Entity [Axis] Axis dei:LegalEntityAxis
736 Entity [Domain] Member dei:EntityDomain
737 Statement Line Items [Line Items] LineItems mag:StatementLineItems
738 Dividends paid, ordinary shares Concept (Monetary) For Period Debit ifrs-full:DividendsPaidOrdinaryShares
739 Total non-current liabilities Concept (Monetary) As Of Credit ifrs-full:NoncurrentLiabilities
740 Working capital Concept (Monetary) As Of Credit mag:WorkingCapital
741 054 - Disclosure - Note 9 - Capital Risk Management - Capital Component (Details) Network

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742 Statement Table [Table] Table

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 mag:StatementTable
743 Legal Entity [Axis] Axis dei:LegalEntityAxis
744 Entity [Domain] Member dei:EntityDomain
745 Statement Line Items [Line Items] LineItems mag:StatementLineItems
746 Equity Concept (Monetary) As Of Credit ifrs-full:Equity
747 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
748 Concept (Monetary) As Of Credit mag:NetCapital
749 055 - Disclosure - Note 10 - Financial Risk Management (Details Textual) Network

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750 Statement Table [Table] Table

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 mag:StatementTable
751 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
752 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
753 MEXICO Member country:MX
754 Country of domicile [member] Member ifrs-full:CountryOfDomicileMember
755 Associates [axis] Axis ifrs-full:SignificantInvestmentsInAssociatesAxis
756 Entity's total for associates [member] Member ifrs-full:EntitysTotalForAssociatesMember
757 Minera Juanicipio [member] Member mag:MineraJuanicipioMember
758 Legal Entity [Axis] Axis dei:LegalEntityAxis
759 Entity [Domain] Member dei:EntityDomain
760 Statement Line Items [Line Items] LineItems mag:StatementLineItems
761 Value added tax receivables Concept (Monetary) As Of Debit ifrs-full:ValueAddedTaxReceivables
762 Net assets liabilities denominated in foreign currencies Concept (Monetary) As Of Debit mag:NetAssetsLiabilitiesDenominatedInForeignCurrencies
763 Percentage change in foreign exchange rates Concept (Percent) As Of mag:PercentageChangeInForeignExchangeRates
764 Impact on earnings excluding currency exposure related taxes Concept (Monetary) As Of mag:ImpactOnEarningsExcludingCurrencyExposureRelatedTaxes
765 Proportion of ownership interest in associate Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInAssociate
766 Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method Concept (Monetary) For Period Credit ifrs-full:ShareOfProfitLossOfContinuingOperationsOfAssociatesAndJointVenturesAccountedForUsingEquityMethod
767 056 - Disclosure - Note 10 - Financial Risk Management - Maximum Exposure to Credit Risk to the Carrying Value of Cash, Term Deposits, and Accounts Receivable (Details) Network

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768 Statement Table [Table] Table

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 mag:StatementTable
769 Legal Entity [Axis] Axis dei:LegalEntityAxis
770 Entity [Domain] Member dei:EntityDomain
771 Statement Line Items [Line Items] LineItems mag:StatementLineItems
772 Cash and cash equivalents Concept (Monetary) As Of Debit ifrs-full:CashAndCashEquivalents
773 Accounts receivable (Note 4) Concept (Monetary) As Of Debit ifrs-full:CurrentTradeReceivables
774 Concept (Monetary) As Of Debit mag:MaximumExposureOfCashTermDepositsAndAccountsReceivableToCreditRisk
775 057 - Disclosure - Note 10 - Financial Risk Management - Currency Risk (Details) Network

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776 Statement Table [Table] Table

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 mag:StatementTable
777 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
778 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
779 MEXICO Member country:MX
780 Country of domicile [member] Member ifrs-full:CountryOfDomicileMember
781 Legal Entity [Axis] Axis dei:LegalEntityAxis
782 Entity [Domain] Member dei:EntityDomain
783 Statement Line Items [Line Items] LineItems mag:StatementLineItems
784 Cash Concept (Monetary) As Of Debit mag:CashAndCashEquivalentDenominatedInForeignCurrencies
785 Accounts receivable Concept (Monetary) As Of Debit mag:CurrentTradeReceivablesDenominatedInForeignCurrencies
786 Prepaid Concept (Monetary) As Of Debit mag:CurrentPrepaidExpensesDenominatedInForeignCurrencies
787 Investments Concept (Monetary) As Of Debit mag:NoncurrentFinancialAssetsDenominatedInForeignCurrencies
788 Accounts payable Concept (Monetary) As Of Credit mag:TradeAndOtherCurrentPayablesDenominatedInForeignCurrencies
789 Net assets exposure Concept (Monetary) As Of Debit mag:NetAssetsLiabilitiesDenomintatedInForeignCurrencies
790 058 - Disclosure - Note 11 - Financial Instruments and Fair Value Disclosures - Financial Assets or Liabilities Measured at Fair Value (Details) Network

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791 Statement Table [Table] Table

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 mag:StatementTable
792 Classes of financial instruments [axis] Axis ifrs-full:ClassesOfFinancialInstrumentsAxis
793 Financial instruments, class [member] Member ifrs-full:ClassesOfFinancialInstrumentsMember
794 Cash and cash equivalents [member] Member mag:CashAndCashEquivalentsMember
795 Investments [member] Member mag:InvestmentsMember
796 Levels of fair value hierarchy [axis] Axis ifrs-full:LevelsOfFairValueHierarchyAxis
797 All levels of fair value hierarchy [member] Member ifrs-full:AllLevelsOfFairValueHierarchyMember
798 Level 1 of fair value hierarchy [member] Member ifrs-full:Level1OfFairValueHierarchyMember
799 Level 2 of fair value hierarchy [member] Member ifrs-full:Level2OfFairValueHierarchyMember
800 Level 3 of fair value hierarchy [member] Member ifrs-full:Level3OfFairValueHierarchyMember
801 Legal Entity [Axis] Axis dei:LegalEntityAxis
802 Entity [Domain] Member dei:EntityDomain
803 Statement Line Items [Line Items] LineItems mag:StatementLineItems
804 Financial assets Concept (Monetary) As Of Debit ifrs-full:FinancialAssetsAtFairValue
805 059 - Disclosure - Note 12 - Segmented Information (Details Textual) Network

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806 Statement Table [Table] Table

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 mag:StatementTable
807 Legal Entity [Axis] Axis dei:LegalEntityAxis
808 Entity [Domain] Member dei:EntityDomain
809 Statement Line Items [Line Items] LineItems mag:StatementLineItems
810 Number of operating segments Concept (Integer) For Period mag:NumberOfOperatingSegments
811 060 - Disclosure - Note 13 - Related Party Transactions (Details Textual) Network

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812 Statement Table [Table] Table

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 mag:StatementTable
813 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
814 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
815 Cascabel and IMDEX [member] Member mag:CascabelAndIMDEXMember
816 Cascabel [member] Member mag:CascabelMember
817 Classes of property, plant and equipment [axis] Axis ifrs-full:ClassesOfPropertyPlantAndEquipmentAxis
818 Property, plant and equipment [member] Member ifrs-full:PropertyPlantAndEquipmentMember
819 Cinco de Mayo property [member] Member mag:CincoDeMayoPropertyMember
820 Legal Entity [Axis] Axis dei:LegalEntityAxis
821 Entity [Domain] Member dei:EntityDomain
822 Fresnillo PLC [member] Member mag:FresnilloPLCMember
823 Joint ventures [axis] Axis ifrs-full:JointVenturesAxis
824 Entity's total for joint ventures [member] Member ifrs-full:EntitysTotalForJointVenturesMember
825 Minera Juanicipio, S.A. de C.V. [member] Member mag:MineraJuanicipioSADeCVMember
826 MAG Silver Corporation [member] Member mag:MagSilverCorporationMember
827 Statement Line Items [Line Items] LineItems mag:StatementLineItems
828 Amounts payable, related party transactions Concept (Monetary) As Of Credit ifrs-full:AmountsPayableRelatedPartyTransactions
829 Net Smelter Returns Royalty Percentage Concept (Percent) For Period mag:NetSmelterRoyaltyReturnsPercentage
830 Percentage interest in acquisition of mineral property Concept (Percent) As Of mag:PercentageInterestInAcquisitionOfMineralProperty
831 Proportion of ownership interest in joint venture Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInJointVenture
832 Fresnillo investment in MAG Silver Corp. common shares Concept (Percent) For Period mag:FresnilloInvestmentInMagSilverCorpCommonShares
833 061 - Disclosure - Note 13 - Related Party Transactions - Incurred Expenses With Cascabel and IMDEX (Details) Network

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834 Statement Table [Table] Table

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 mag:StatementTable
835 Categories of related parties [axis] Axis ifrs-full:CategoriesOfRelatedPartiesAxis
836 Entity's total for related parties [member] Member ifrs-full:EntitysTotalForRelatedPartiesMember
837 Cascabel and IMDEX [member] Member mag:CascabelAndIMDEXMember
838 Legal Entity [Axis] Axis dei:LegalEntityAxis
839 Entity [Domain] Member dei:EntityDomain
840 Statement Line Items [Line Items] LineItems mag:StatementLineItems
841 Exploration and marketing services Concept (Monetary) For Period Debit mag:ExpensesIncurredForRelatedPartiesExplorationAndMarketingServices
842 Travel and expenses Concept (Monetary) For Period Debit mag:ExpensesIncurredForRelatedPartiesTravelAndExpenses
843 Administration for Mexican subsidiaries Concept (Monetary) For Period Debit mag:ExpensesIncurredForRelatedPartiesAdministrationForForeignSubsidiaries
844 Field exploration services Concept (Monetary) For Period Debit mag:ExpensesIncurredForRelatedPartiesFieldExplorationServices
845 Concept (Monetary) For Period Debit mag:ExpensesIncurredForRelatedParties
846 062 - Disclosure - Note 13 - Related Party Transactions - Subsidiary Ownership (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-13-related-party-transactions-subsidiary-ownership-details
847 Statement Table [Table] Table

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 mag:StatementTable
848 Subsidiaries [axis] Axis ifrs-full:SignificantInvestmentsInSubsidiariesAxis
849 Entity's total for subsidiaries [member] Member ifrs-full:EntitysTotalForSubsidiariesMember
850 Minera Los Lagartos, S.A. de C.V. [member] Member mag:MineraLosLagartosSADeCVMember
851 Minera Pozo Seco S.A. de C.V. [member] Member mag:MineraPozoSecoSADeCVMember
852 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
853 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
854 MEXICO Member country:MX
855 Legal Entity [Axis] Axis dei:LegalEntityAxis
856 Entity [Domain] Member dei:EntityDomain
857 Statement Line Items [Line Items] LineItems mag:StatementLineItems
858 MAG's effective interest Concept (Percent) For Period ifrs-full:ProportionOfOwnershipInterestInSubsidiary
859 063 - Disclosure - Note 13 - Related Party Transactions - Compensation of Key Management Personnel (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-13-related-party-transactions-compensation-of-key-management-personnel-details
860 Statement Table [Table] Table

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 mag:StatementTable
861 Legal Entity [Axis] Axis dei:LegalEntityAxis
862 Entity [Domain] Member dei:EntityDomain
863 Statement Line Items [Line Items] LineItems mag:StatementLineItems
864 Salaries and other short term employee benefits Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationShorttermEmployeeBenefits
865 Share based payments (Note 8(b), (c ), and (d)) Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensationSharebasedPayment
866 Concept (Monetary) For Period Debit ifrs-full:KeyManagementPersonnelCompensation
867 064 - Disclosure - Note 14 - Commitments and Contingencies (Details Textual) Network

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 http://www.magsilver.com/20181231/role/statement-note-14-commitments-and-contingencies-details-textual
868 Statement Table [Table] Table

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 mag:StatementTable
869 Types of contracts [axis] Axis ifrs-full:TypesOfContractsAxis
870 Types of contracts [member] Member ifrs-full:TypesOfContractsMember
871 Contractual commitments for equipment [member] Member mag:ContractualCommitmentsForEquipmentMember
872 Development contracts [member] Member mag:DevelopmentContractsMember
873 Legal Entity [Axis] Axis dei:LegalEntityAxis
874 Entity [Domain] Member dei:EntityDomain
875 Statement Line Items [Line Items] LineItems mag:StatementLineItems
876 Disclosure of capital commitments in relation to investment in associates Concept (Monetary) As Of Credit mag:DisclosureOfCapitalCommitmentsInRelationToInvestmentInAssociates
877 065 - Disclosure - Note 14 - Commitments and Contingencies - Contractual Obligations and Commitments (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-14-commitments-and-contingencies-contractual-obligations-and-commitments-details
878 Statement Table [Table] Table

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 mag:StatementTable
879 Classes of liabilities [axis] Axis ifrs-full:ClassesOfLiabilitiesAxis
880 Liabilities [member] Member ifrs-full:LiabilitiesMember
881 Committed exploration expenditures [member] Member mag:CommittedExplorationExpendituresMember
882 Minera Juanicipio [member] Member mag:MineraJuanicipioMember
883 Maturity [axis] Axis ifrs-full:MaturityAxis
884 Aggregated time bands [member] Member ifrs-full:AggregatedTimeBandsMember
885 Not later than one year [member] Member ifrs-full:NotLaterThanOneYearMember
886 Later than one year and not later than three years [member] Member ifrs-full:LaterThanOneYearAndNotLaterThanThreeYearsMember
887 Later than three years and not later than five years [member] Member ifrs-full:LaterThanThreeYearsAndNotLaterThanFiveYearsMember
888 Later than five years [member] Member ifrs-full:LaterThanFiveYearsMember
889 Legal Entity [Axis] Axis dei:LegalEntityAxis
890 Entity [Domain] Member dei:EntityDomain
891 Statement Line Items [Line Items] LineItems mag:StatementLineItems
892 Contractual capital commitments Concept (Monetary) As Of Credit ifrs-full:ContractualCapitalCommitments
893 Office and other commitments Concept (Monetary) As Of Credit mag:MinimumContractualLeasePaymentOnOperatingLeaseAndOtherCommitments
894 Total Obligations Concept (Monetary) As Of Credit mag:FinancialLiabilitiesAndCapitalCommitments
895 066 - Disclosure - Note 15 - Income Taxes (Details Textual) Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes-details-textual
896 Statement Table [Table] Table

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 mag:StatementTable
897 Geographical areas [axis] Axis ifrs-full:GeographicalAreasAxis
898 Geographical areas [member] Member ifrs-full:GeographicalAreasMember
899 Country of domicile [member] Member ifrs-full:CountryOfDomicileMember
900 MEXICO Member country:MX
901 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
902 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
903 Non-capital loss carry forwards [member] Member mag:NoncapitalLossCarryForwardsMember
904 Capital loss carry forwards [member] Member mag:CapitalLossCarryForwardsMember
905 Legal Entity [Axis] Axis dei:LegalEntityAxis
906 Entity [Domain] Member dei:EntityDomain
907 Statement Line Items [Line Items] LineItems mag:StatementLineItems
908 Deductible temporary differences for which no deferred tax asset is recognised Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised
909 Unused tax losses for which no deferred tax asset recognised Concept (Monetary) As Of ifrs-full:UnusedTaxLossesForWhichNoDeferredTaxAssetRecognised
910 Cash and cash equivalents held by subsidiaries Concept (Monetary) As Of Debit mag:CashAndCashEquivalentsHeldBySubsidiaries
911 Current tax liabilities Concept (Monetary) As Of Credit ifrs-full:CurrentTaxLiabilities
912 067 - Disclosure - Note 15 - Income Taxes - Income Taxes Recognized in Profit or Loss (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes-income-taxes-recognized-in-profit-or-loss-details
913 Statement Table [Table] Table

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 mag:StatementTable
914 Legal Entity [Axis] Axis dei:LegalEntityAxis
915 Entity [Domain] Member dei:EntityDomain
916 Statement Line Items [Line Items] LineItems mag:StatementLineItems
917 Deferred tax expense Concept (Monetary) For Period Debit ifrs-full:DeferredTaxExpenseIncomeRelatingToOriginationAndReversalOfTemporaryDifferences
918 Total income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
919 068 - Disclosure - Note 15 - Income Taxes - Provision for Income Taxes (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes-provision-for-income-taxes-details
920 Statement Table [Table] Table

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 mag:StatementTable
921 Legal Entity [Axis] Axis dei:LegalEntityAxis
922 Entity [Domain] Member dei:EntityDomain
923 Statement Line Items [Line Items] LineItems mag:StatementLineItems
924 Loss for the year before income taxes Concept (Monetary) For Period Credit ifrs-full:ProfitLossBeforeTax
925 Statutory tax rate Concept (Percent) For Period ifrs-full:ApplicableTaxRate
926 Recovery of income taxes computed at statutory rates Concept (Monetary) For Period Debit ifrs-full:TaxExpenseIncomeAtApplicableTaxRate
927 Share based payments Concept (Monetary) For Period Debit mag:TaxEffectOfRevenuesShareBasedPayments
928 Mexican inflationary adjustments Concept (Monetary) For Period Debit mag:TaxEffectOfInflationOnTaxValues
929 Differing effective tax rate on loss in foreign jurisdiction Concept (Monetary) For Period Debit mag:TaxEffectOfHigherEffectiveTaxRateOnLossInForeignJurisdiction
930 Impact of change in statutory tax rates Concept (Monetary) For Period Debit ifrs-full:TaxEffectFromChangeInTaxRate
931 Unrecognized deferred tax assets Concept (Monetary) For Period Debit mag:TaxEffectOfUnrecognizedDeferredTaxRates
932 Impact of foreign exchange and other Concept (Monetary) For Period Debit mag:TaxEffectOfForeignExchanges
933 Total income tax expense Concept (Monetary) For Period Debit ifrs-full:IncomeTaxExpenseContinuingOperations
934 069 - Disclosure - Note 15 - Income Taxes - Deferred Tax Liability (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes-deferred-tax-liability-details
935 Statement Table [Table] Table

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 mag:StatementTable
936 Legal Entity [Axis] Axis dei:LegalEntityAxis
937 Entity [Domain] Member dei:EntityDomain
938 Statement Line Items [Line Items] LineItems mag:StatementLineItems
939 Exploration and evaluation assets Concept (Monetary) As Of Debit mag:DeferredTaxAssetsExplorationAndEvaluationAssets
940 Non-capital losses Concept (Monetary) As Of Debit mag:DeferredTaxAssetsNoncapitalLosses
941 Capital losses Concept (Monetary) As Of Debit mag:DeferredTaxAssetsCapitalLosses
942 Other Concept (Monetary) As Of Debit mag:DeferredTaxAssetsOther
943 Concept (Monetary) As Of Debit ifrs-full:DeferredTaxAssets
944 Exploration and evaluation assets Concept (Monetary) As Of Credit mag:DeferredTaxLiabilitiesExplorationAndEvaluationAssets
945 Investment in associate Concept (Monetary) As Of Credit mag:DeferredTaxLiabilitiesInvestments
946 Unrealized capital gain on foreign exchange Concept (Monetary) As Of Credit mag:DeferredTaxLiabilitiesUnrealizedForeignExchange
947 Other Concept (Monetary) As Of Credit mag:DeferredTaxLiabilitiesOther
948 Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilities
949 Net deferred income tax liability Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
950 070 - Disclosure - Note 15 - Income Taxes - Movement of Net Deferred Tax Liabilities (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes-movement-of-net-deferred-tax-liabilities-details
951 Statement Table [Table] Table

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 mag:StatementTable
952 Legal Entity [Axis] Axis dei:LegalEntityAxis
953 Entity [Domain] Member dei:EntityDomain
954 Statement Line Items [Line Items] LineItems mag:StatementLineItems
955 Balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
956 Deferred income tax (expense) recovery through income statement Concept (Monetary) For Period ifrs-full:DeferredTaxExpenseIncomeRecognisedInProfitOrLoss
957 Balance Concept (Monetary) As Of Credit ifrs-full:DeferredTaxLiabilityAsset
958 071 - Disclosure - Note 15 - Income Taxes - Deductible Temporary Differences (Details) Network

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 http://www.magsilver.com/20181231/role/statement-note-15-income-taxes-deductible-temporary-differences-details
959 Statement Table [Table] Table

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 mag:StatementTable
960 Temporary difference, unused tax losses and unused tax credits [axis] Axis ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsAxis
961 Temporary difference, unused tax losses and unused tax credits [member] Member ifrs-full:TemporaryDifferenceUnusedTaxLossesAndUnusedTaxCreditsMember
962 Non-capital losses [member] Member mag:NoncapitalLossesMember
963 Excess of tax value of exploration and evaluation assets over book values [member] Member mag:ExcessOfTaxValueOfExplorationAndEvaluationAssetsOverBookValuesMember
964 Financing fees [member] Member mag:FinancingFeesMember
965 Other deductible temporary differences for which no deferred tax assets have been recognized [member] Member mag:OtherDeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetsHaveBeenRecognizedMember
966 Legal Entity [Axis] Axis dei:LegalEntityAxis
967 Entity [Domain] Member dei:EntityDomain
968 Statement Line Items [Line Items] LineItems mag:StatementLineItems
969 Deductible temporary differences for which no deferred tax assets have been recognized Concept (Monetary) As Of ifrs-full:DeductibleTemporaryDifferencesForWhichNoDeferredTaxAssetIsRecognised

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