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Leases
 12 Months Ended
Dec. 31, 2021
Disclosure of Leases [Abstract]  
Leases
16. LEASES
a.Right-of-use assets ("ROU")
The following table summarizes changes in ROU assets for the year ended December 31, 2021, which have been recorded in mineral properties, plant and equipment on the consolidated statements of financial position:
December 31,
2021		December 31,
2020
Opening net book value$33,543 $43,361 
Additions9,924 5,534 
Depreciation(12,444)(14,244)
Other(1,527)(1,108)
Closing net book value$29,496 $33,543 
b.Lease obligations
The following table presents a reconciliation of the Company's undiscounted cash flows at December 31, 2021 and December 31, 2020 to their present value for the Company's lease obligations:
December 31,
2021		December 31,
2020
Within one year$11,690 $13,505 
Between one and five years16,676 17,902 
Beyond five years16,934 19,255 
Total undiscounted lease obligations45,300 50,662 
Less future interest charges(14,739)(17,097)
Total discounted lease obligations$30,561 $33,565 
Less: current portion of lease obligations(10,663)(12,829)
Non-current portion of lease obligations$19,898 $20,736