XML 170 R123.htm IDEA: XBRL DOCUMENT v3.21.1
Commitments and Contractual Obligations - Narrative (Details)
m in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 03, 2020
$ / oz
Mar. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Apr. 30, 2007
USD ($)
$ / oz
Jun. 30, 2020
$ / oz
m
Dec. 31, 2020
USD ($)
T
Dec. 31, 2019
USD ($)
Disclosure of contingent liabilities [line items]                
Proceeds from borrowings, classified as financing activities | $             $ 150,000,000 $ 494,000,000
Consideration paid | $       $ (8,075,000) $ 57,500,000      
Silver price ($/oz) | $ / oz 11.43       3.90 2.00    
Expansion drilling (in meters) | m           30    
Revolving credit facility                
Disclosure of contingent liabilities [line items]                
Proceeds from borrowings, classified as financing activities | $   $ 150,000,000 $ 150,000,000       $ 150,000,000  
Hellas Gold SA ("Hellas") | Zinc                
Disclosure of contingent liabilities [line items]                
Number of dry metric tonnes             28,000  
Hellas Gold SA ("Hellas") | Lead And Silver Concentrates                
Disclosure of contingent liabilities [line items]                
Number of dry metric tonnes             4,500  
Hellas Gold SA ("Hellas") | Gold Concentrate                
Disclosure of contingent liabilities [line items]                
Number of dry metric tonnes             150,000  
Tuprag Metal Madencilik Sanayi Ve Ticaret AS | Gold Concentrate                
Disclosure of contingent liabilities [line items]                
Number of dry metric tonnes             58,500