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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2019
Text Block [Abstract]  
Disclosure Of Detailed Information About Contractual Obligations Outstanding
At December 31, 2019, the Company had the following contractual obligations outstanding:
 
    Total   
Within 1
year
   
1-2
years
   
2-3
years
   
3-4
years
   
4–5
years
   Thereafter  
 Loans and borrowings and accrued interest
  $331,720   $77,462   $53,364   $52,280   $6,983   $141,631   $-  
 Accounts payable and accrued liabilities
   67,047    67,047    -    -    -    -    -  
 Reclamation obligations
(1)
   38,116    459    3,642    4,547    3,204    3,717    22,547  
 Purchase commitments
   27,638    25,008    1,541    969    112    7    1  
 Lease commitments
   1,068    365    204    210    216    73    -  
 Total
  $  465,589   $  170,341   $    58,751   $    58,006   $      10,515   $      145,428   $          22,548  
(1)   Amount represents undiscounted future cash flows.