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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Other operating activities    
Share-based compensation expense $ 5,128 $ 3,024
Unrealized investment loss (income) 59,722 (58,673)
Gains on derivatives (Note 8c) (5,393) (3,543)
Gains on warrants 0 (38)
Income from equity investees (Note 12) (4,347) (10,529)
Gains on sale of mineral properties, plant and equipment (Note 11) (32,167) (7,922)
Net realizable value adjustment for inventories 8,719 (16,175)
Other inflows (outflows) of cash, classified as operating activities (28,060) (35,183)
Changes in non-cash operating working capital items:    
Trade and other receivables (2,874) 54,838
Inventories (82,885) (14,623)
Prepaid expenses 1,049 2,353
Accounts payable and accrued liabilities 18,086 56,816
Provisions (4,445) (2,402)
Changes in non-cash working capital (71,069) 96,982
Significant non-cash items [Abstract]    
Increase (decrease) through share-based payment transactions, equity 3,312 2,826
Cash and Cash Equivalents    
Cash in banks 283,550 167,113
Issued capital [member]    
Significant non-cash items [Abstract]    
Increase (decrease) through share-based payment transactions, equity $ 3,312 $ 2,826