| Standard label: | Payments to Acquire Mineral Rights |
| Name: | us-gaap:PaymentsToAcquireMineralRights |
| Documentation: | The cash outflow from the acquisition of a mineral right which is the right to extract a mineral from the earth or to receive payment, in the form of royalty, for the extraction of minerals. |
| Object type: | cm:Concept |
| Data type: | Monetary (xbrli:monetaryItemType) |
| Period type: | For Period (duration) |
| Balance type: | Credit |
| Abstract: | false |
| Workiva Wdesk Taxonomy Analyzer: | us-gaap:PaymentsToAcquireMineralRights |
| Label | Role | Language |
| Payments to Acquire Mineral Rights | http://www.xbrl.org/2003/role/label | en-US |
| Reference | Role | Topic |
| FASB Accounting Standards Codification 230 10 45 13 (c) | http://fasb.org/us-gaap/role/ref/legacyRef | 230 |
| Part Of Roll Up: |
| us-gaap:PaymentsToAcquireProductiveAssets |