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PRODUCTION COSTS (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Analysis of income and expense [abstract]    
Labour $ 120,306,000 $ 110,022,000
Raw materials and consumables 137,215,000 130,007,000
Contractors 58,068,000 42,715,000
Royalties 57,496,000 33,771,000
Change in inventory and capitalized costs (340,437,000) (33,022,000)
Inventory recognised during period 349,767,000 0
Other 36,237,000 46,317,000
Production costs 418,652,000 329,810,000
Acquired inventories, fair value adjustment $ 51,900,000 $ 0