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INCOME AND MINING TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deductible temporary differences relating to:    
Marketable securities $ 1,147 $ 2,397
Reclamation liabilities 40,118 31,080
Lease liabilities 26,618 28,730
Deductibility of other taxes 10,311 10,224
Stock-based compensation 2,030 2,931
Other items 19,627 13,286
Deferred tax assets, gross 99,851 88,648
Investment incentive tax credits 17,912 18,772
Tax loss carryforwards 53,164 43,384
Less: Valuation allowance   (74,640) (61,101)
Total deferred income tax assets 96,287 89,703
Taxable temporary differences relating to:    
Marketable securities (1,137) 0
Inventories (16,969) (49,004)
Mineral properties, plant and equipment (380,348) (332,886)
Convertible notes 0 (95)
Mineral tax (38,969) (41,803)
Other items (409) (6,401)
Total deferred income tax liabilities (437,832) (430,189)
Balance sheet presentation    
Deferred income tax assets 22,307 1,915
Deferred income tax liabilities (363,852) (342,401)
Deferred income tax liabilities, net $ (341,545) $ (340,486)