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INCOME AND MINING TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Deductible temporary differences relating to:    
Marketable securities $ 2,397 $ 634
Reclamation liabilities 31,080 27,608
Lease liabilities 28,730 23,895
Deductibility of other taxes 10,224 9,299
Stock-based compensation 2,931 7,247
Other items 13,286 16,595
Deferred tax assets, gross 88,648 85,278
Investment incentive tax credits 18,772 46,354
Tax loss carryforwards 43,384 25,395
Less: Valuation allowance   (61,101) (38,496)
Total deferred income tax assets 89,703 118,531
Taxable temporary differences relating to:    
Marketable securities 0 (270)
Inventories (49,004) (17,768)
Mineral properties, plant and equipment (332,886) (365,793)
Convertible notes (95) (359)
Mineral tax (41,803) (38,452)
Foreign withholding tax 0 (17,080)
Other items (6,401) (9,096)
Total deferred income tax liabilities (430,189) (448,818)
Balance sheet presentation    
Deferred income tax assets 1,915 8,501
Deferred income tax liabilities (342,401) (338,788)
Deferred income tax liabilities, net $ (340,486) $ (330,287)