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Gains (losses) from operating activities in the statement of income, included according to their nature (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Amounts recovered from insurance $ 320 $ 827  
Total 18,218 32,048 $ 17,827
Other Incomes [Member]      
Statement [Line Items]      
Discounts obtained from suppliers 676 705 345
Fines charged to suppliers 483 698 199
Taxes recovered 457 996 1,278
Amounts recovered from insurance 492 443 154
Overestimate of provisions for third-party obligations 983 375 586
Other operating income 2,422 1,536 4,543
Options on mining claims 5,298 16,095 2,607
Easements, pipelines and roads 7,204 10,806 4,656
Reimbursement mining licenses and notary expenses 203 394 1,196
Shares obtained in junior mining companies through options 0 0 2,263
Total $ 18,218 $ 32,048 $ 17,827