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Revenue (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of Revenue From Contracts with Customers [Abstract]  
Revenue from contracts with customers by product and segment
For the year ended December 31, 2020, revenue from contracts with customers by product and segment was as follows:
TurkeyCanadaGreeceTotal
Gold revenue - doré$403,823 $256,069 $— $659,892 
Gold revenue - concentrate181,727 — 100,928 282,655 
Silver revenue - doré2,194 1,198 — 3,392 
Silver revenue - concentrate3,981 — 24,029 28,010 
Lead concentrate— — 18,285 18,285 
Zinc concentrate— — 36,993 36,993 
Revenue from contracts with customers$591,725 $257,267 $180,235 $1,029,227 
Gain (loss) on revaluation of derivatives in trade receivables(3,537)— 995 (2,542)
$588,188 $257,267 $181,230 $1,026,685 

For the year ended December 31, 2019, revenue from contracts with customers by product and segment was as follows:
TurkeyCanadaGreeceTotal
Gold revenue - doré$196,590 $124,760 $— $321,350 
Gold revenue - concentrate149,841 — 57,419 207,260 
Silver revenue - doré1,191 522 — 1,713 
Silver revenue - concentrate2,793 — 14,795 17,588 
Lead concentrate— — 24,943 24,943 
Zinc concentrate— — 43,067 43,067 
Revenue from contracts with customers$350,415 $125,282 $140,224 $615,921 
Gain (loss) on revaluation of derivatives in trade receivables1,970 — (68)1,902 
$352,385 $125,282 $140,156 $617,823