ASSET RETIREMENT AND ENVIRONMENTAL REMEDIATION OBLIGATIONS - Narrative (Details) $ in Millions |
9 Months Ended |
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Sep. 30, 2026
USD ($)
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| Asset Retirement Obligation And Accrual For Environmental Loss Contingencies [Line Items] | |
| Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag | environmental remediation liability |
| New Horizon Mine | |
| Asset Retirement Obligation And Accrual For Environmental Loss Contingencies [Line Items] | |
| Environmental reclamation obligations | $ 62.5 |
| Discounted basis of environmental reclamation obligation | $ 24.7 |
| Discount rate of environmental reclamation obligations (as a percent) | 6.73% |
| Undiscounted future cash outflows of environmental reclamation obligations | $ 36.6 |
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- Definition Accrual For Environmental Loss Contingencies, Net Of Discount No definition available.
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- Definition Asset Retirement Obligation And Accrual For Environmental Loss Contingencies No definition available.
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- Definition Environmental Loss Contingency, Statement Of Financial Position, Extensible Enumeration, Not Disclosed Flag No definition available.
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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Rate applied to the undiscounted amount of environmental loss contingencies to arrive at the present value recorded as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Undiscounted amount of the accrual for environmental loss contingencies. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Details
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