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INCOME AND MINING TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deductible temporary differences relating to: |  |
Marketable securities | $ 634 | $ 0
Inventories | 0 | 3,245
Reclamation liabilities | 27,608 | 20,117
Lease liabilities | 23,895 | 24,307
Deductibility of other taxes | 9,299 | 10,770
Stock-based compensation | 7,247 | 11,410
Other items | 16,595 | 7,873
Deferred tax assets, gross | 85,278 | 77,722
Investment incentive tax credits | 46,354 | 168,447
Tax loss carryforwards | 25,395 | 22,597
Less: Valuation allowance | (38,496) | (37,410)
Total deferred income tax assets | 118,531 | 231,356
Taxable temporary differences relating to: |  |
Marketable securities | (270) | (2,041)
Inventories | (17,768) | (47,484)
Mineral properties, plant and equipment | (365,793) | (566,922)
Convertible notes | (359) | (414)
Mineral tax | (38,452) | (39,575)
Foreign withholding tax | (17,080) | (32,875)
Other items | (9,096) | 0
Total deferred income tax liabilities | (448,818) | (689,311)
Balance sheet presentation |  |
Deferred income tax assets | 8,501 | 15,072
Deferred income tax liabilities | (338,788) | (473,027)
Deferred income tax liabilities, net | $ (330,287) | $ (457,955)

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