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Property, plant and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, plant and equipments [Abstract]      
Land $ 23,579 $ 23,620  
Buildings 239,666 227,173  
Other property, plant and equipment 35,418 32,645  
Transport equipment 2,880 2,686  
Suppliers and accessories 4,183 4,579  
Office equipment 459 420  
Network and communication equipment 1,272 663  
Mining assets 47,052 23,174  
IT equipment 4,083 4,359  
Energy generating assets 4,878 5,998  
Construction in progress 486,345 375,316  
Machinery, plant and equipment 887,504 869,273  
Total 1,737,319 1,569,906 $ 1,454,823
Description of classes of property, plant and equipment [Abstract]      
Pumps 28,184 32,525  
Conveyor belt 20,117 21,911  
Crystallizer 22,145 24,102  
Plant equipment 173,335 170,263  
Water tanks 15,367 14,159  
Filter 35,553 27,080  
Facilities or electrical equipment 93,937 92,090  
Other machinery, plant and equipment 49,930 53,409  
Site Closure 36,828 12,056  
Piping 102,578 96,402  
Pond 41,906 41,319  
Well 226,347 238,670  
Parts 41,277 45,287  
Total 887,504 869,273  
Gross carrying amount [member]      
Property, plant and equipments [Abstract]      
Land 23,579 23,620  
Buildings 705,089 666,027  
Other property, plant and equipment 234,238 257,247  
Transport equipment 13,030 12,143  
Suppliers and accessories 26,101 25,531  
Office equipment 11,607 11,441  
Network and communication equipment 8,951 8,009  
Mining assets 194,562 161,619  
IT equipment 29,629 28,693  
Energy generating assets 38,540 38,495  
Construction in progress 486,345 375,316  
Machinery, plant and equipment 3,304,061 3,142,461  
Total 5,075,732 4,750,602 4,450,037
Description of classes of property, plant and equipment [Abstract]      
Total 3,304,061 3,142,461  
Accumulated depreciation and amortisation [member]      
Property, plant and equipments [Abstract]      
Buildings (465,423) (438,854)  
Other property, plant and equipment (198,820) (224,602)  
Transport equipment (10,150) (9,457)  
Suppliers and accessories (21,918) (20,952)  
Office equipment (11,148) (11,021)  
Network and communication equipment (7,679) (7,346)  
Mining assets (147,510) (138,445)  
IT equipment (25,546) (24,334)  
Energy generating assets (33,662) (32,497)  
Machinery, plant and equipment (2,416,557) (2,273,188)  
Total (3,338,413) (3,180,696) $ (2,995,214)
Description of classes of property, plant and equipment [Abstract]      
Total $ (2,416,557) $ (2,273,188)