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