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INCOME TAXES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Effective tax rate (as a percent) | 17.80% | 22.00% | 14.90%
Additional recoverable basis | $ (16,300,000) |  |
Non-deductible acquisition cost | 1,615,000 | $ 0 | $ 0
Valuation allowance | 86,747,000 | 44,656,000 |
Net operating losses | 54,455,000 | 5,863,000 |
Operating loss carryforwards valuation allowance | 2,700,000 | 2,200,000 |
Unrecognized tax benefits | 0 | 0 |
Accrued income-tax-related interest and penalties | 0 | 0 | $ 0
United States And Canada |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Non-deductible acquisition cost | 2,900,000 |  |
Mexico |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Recovery of foreign withholding tax | (11,000,000) |  |
Mt. Milligan |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
U.S. GILTI income tax expense |  | $ 13,000,000 |
US Foreign |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Valuation allowance | 35,600,000 |  |
Capital loss |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Valuation allowance | 8,700,000 |  |
Mineral Properties |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Valuation allowance | 39,000,000 |  |
Operating loss carryforwards |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Valuation allowance | 2,700,000 |  |
Other tax carryforwards |  |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |  |
Valuation allowance | $ 700,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-6 + Details
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