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Leases
 12 Months Ended
Dec. 31, 2020
Disclosure of Leases [Abstract]  
Leases
18. LEASES
a.ROU Assets
The following table summarizes changes in ROU Assets for the years ended December 31, 2020 and 2019, which include land, buildings, vehicles, and machinery and equipment which have been recorded in mineral properties, plant and equipment on the Consolidated Statements of Financial Position:
December 31,
2020		December 31,
2019
CostCost
Balance, January 1, 2020$60,779 Balance, January 1, 2019$34,983 
Additions5,534 
Additions (1)
42,415 
Transfer out(10,458)Transfer out(16,619)
Balance, December 31, 202055,855 Balance, December 31, 201960,779 
Accumulated DepreciationAccumulated Depreciation
Balance, January 1, 2020(17,418)Balance, January 1, 2019(4,780)
Amortization(14,244)
Amortization (2)
(20,103)
Transfer out9,350 Transfer out7,465 
Balance, December 31, 2020(22,312)Balance, December 31, 2019(17,418)
Carrying AmountsCarrying Amounts
At January 1, 202043,361 At January 1, 201930,203 
At December 31, 2020$33,543 At December 31, 2019$43,361 
(1)Includes $8.5 million in assets acquired from Tahoe Acquisition (Note 8).
(2)Includes an impairment charge of $2.4 million (Note 13) related to the Manantial Espejo mineral property, and the COSE and Joaquin projects.
b.Lease obligations
The following table presents a reconciliation of the Company's undiscounted cash flows at December 31, 2020 and December 31, 2019 to their present value for the Company's lease obligations:
December 31,
2020		December 31,
2019
Within one year$13,505 $16,221 
Between one and five years17,902 23,099 
Beyond five years19,255 21,675 
Total undiscounted lease obligations50,662 60,995 
Less future interest charges(17,097)(19,787)
Total discounted lease obligations$33,565 $41,208 
Less: current portion of lease obligations(12,829)(14,198)
Non-current portion of lease obligations$20,736 $27,010