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Gains (losses) from operating activities in the statement of income by function of expenses, included according to their nature (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Amounts recovered from insurance $ 827 $ 126  
Total 32,048 17,827 $ 15,202
Other Incomes [Member]      
Discounts obtained from suppliers 705 345 771
Fines charged to suppliers 698 199 358
Taxes recovered 685 1,278 657
Amounts recovered from insurance 443 154 5,636
Overestimate of provisions for third-party obligations 375 586 573
Options on mining claims 16,095 2,607 2,577
Easements, pipelines and roads 10,806 4,656 219
Reimbursement mining licenses and notary expenses 394 1,196 1,300
Shares obtained in junior mining companies 0 2,263 421
Other operating income 1,847 4,543 2,690
Total $ 32,048 $ 17,827 $ 15,202