XML 122 R83.htm IDEA: XBRL DOCUMENT v3.20.4
Investment in Associates - Additional Information (Details) - USD ($)
 2 Months Ended 5 Months Ended 12 Months Ended
Jun. 05, 2020
Dec. 31, 2020
Oct. 29, 2020
Jun. 05, 2020
Dec. 31, 2020
Dec. 31, 2019
Disclosure of associates [line items]            
Proceeds from issue of equity shares         $ 4,737,000 $ 2,781,000
Warrant liability, representing in-substance ownership   $ 0     0 (15,040,000)
Income (loss) in associate         10,529,000 $ 15,245,000
Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Common shares issued in connection with exercise of stock options (shares) 8,250,000          
Proceeds from exercise of warrants $ 15,600,000          
Warrant liability, representing in-substance ownership   $ (15,000,000.0)     (15,000,000.0)  
Proportion of ownership interest in associate   17.00% 18.00% 26.00%   26.00%
Deferred revenue   $ (13,300,000)     (13,300,000) $ (12,500,000)
Gain on disposition of shares pursuant to Secondary Offering         23,467,000 0
Dilution gains         9,200,000 13,500,000
Income (loss) in associate         1,369,000 $ 1,765,000
Maverix Metals Inc. [member] | Exercise Price of $1.56 [Member]            
Disclosure of associates [line items]            
Common shares issued in connection with exercise of stock options (shares) 5,000,000          
Exercise price (in USD per share) $ 1.56     $ 1.56    
Maverix Metals Inc. [member] | Exercise Price of $2.408 [Member]            
Disclosure of associates [line items]            
Common shares issued in connection with exercise of stock options (shares) 3,250,000          
Exercise price (in USD per share) $ 2.408     2.408    
Maverix Metals Inc. [member] | Secondary Offering [Member]            
Disclosure of associates [line items]            
Gain on disposition of shares pursuant to Secondary Offering         $ 23,500,000  
La Colorada mine [member] | Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Agreements to sell future gold production, percent of production (percent)         100.00%  
Agreements to sell future gold production, price per ounce (in USD per ounce)   650     650  
La Bolsa mine [member] | Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Agreements to sell future gold production, percent of production (percent)         5.00%  
Agreements to sell future gold production, price per ounce (in USD per ounce)   450     450  
Ordinary shares [member] | Maverix Metals Inc. [member]            
Disclosure of associates [line items]            
Number of shares acquired (sold) 8,250,000          
Ordinary shares [member] | Maverix Metals Inc. [member] | Secondary Offering [Member]            
Disclosure of associates [line items]            
Number of shares acquired (sold) (10,350,000)          
Sale of common shares, price per share $ 4.40     $ 4.40    
Proceeds from issue of equity shares $ 45,500,000          
Underwriting fees, percentage of gross proceeds 4.00%          
Underwriting fees paid $ 1,900,000