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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Amounts recovered from insurance $ 347 $ 320  
Total 26,893 18,218 $ 32,048
Other Incomes [Member]      
Statement [Line Items]      
Discounts obtained from suppliers 665 676 705
Fines charged to suppliers 267 483 698
Taxes recovered 346 457 996
Amounts recovered from insurance 14,719 492 443
Overestimate of provisions for third-party obligations 118 983 375
Sale of assets classified as properties, plant and equipment 3,222 2,422 1,536
Options on mining claims 5,852 5,298 16,095
Easements, pipelines and roads 1,619 7,204 10,806
Mining licenses and notary costs reimbursed 85 203 394
Total $ 26,893 $ 18,218 $ 32,048