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Leases and right-of-use assets
 12 Months Ended
Dec. 31, 2020
Disclosure of Leases [Abstract]  
Leases and right-of-use assets
13. Leases and right-of-use assets
As a lessee, the Company leases various assets including mobile mine equipment, office and properties. These right-of-use assets are presented as property, plant and equipment.
Right-of-use
Land and buildings
Right-of-use
Plant and equipment 		Total
Cost
Opening balance at January 1, 2019$— $11,345 $11,345 
Initial adoption of IFRS 167,555 1,824 9,379 
Additions552 13,463 14,015 
Disposals— (232)(232)
Balance at December 31, 2019$8,107 $26,400 $34,507 
Additions6,922 4,372 11,294 
Disposals(474)(931)(1,405)
Balance at December 31, 2020$14,555 $29,841 $44,396 
Accumulated Depreciation
Opening balance at January 1, 2019$— $— $— 
Depreciation for the year(1,184)(4,705)(5,889)
Disposals— 151 151 
Balance at December 31, 2019$(1,184)$(4,554)$(5,738)
Depreciation for the year(1,200)(5,926)(7,126)
Disposals81 206 287 
Balance at December 31, 2020$(2,303)$(10,274)$(12,577)
Right-of-use assets, net carrying amount at December 31, 20196,923 21,846 28,769 
Right-of-use assets, net carrying amount at December 31, 2020$12,252 $19,567 $31,819 
Interest expense on lease liabilities is disclosed in Note 18(b) and the cash payments for the principal portion of lease liabilities is presented on the Consolidated Statement of Cash Flow. The Company's future obligations related to lease liabilities is disclosed in Note 24.