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Property, plant and equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 01, 2019
Dec. 31, 2017
Property, plant and equipments [Abstract]        
Land $ 23,620 $ 24,695    
Buildings 252,969 238,808    
Other property, plant and equipment 32,604 28,175    
Transport equipment 6,042 2,892    
Suppliers and accessories 4,579 4,722    
Office equipment 420 513    
Network and communication equipment 663 692    
Mining assets 23,174 11,501    
IT equipment 4,359 4,980    
Energy generating assets 5,998 6,117    
Construction in progress 375,316 207,830    
Machinery, plant and equipment 877,326 923,898    
Total 1,607,070 1,454,823   $ 1,429,354
Description of classes of property, plant and equipment [Abstract]        
Pumps 32,525 34,145    
Conveyor belt 21,911 22,082    
Crystallizer 24,102 27,112    
Plant equipment 170,263 188,934    
Water tanks 14,159 14,876    
Filter 27,080 29,300    
Facilities or electrical equipment 92,090 96,179    
Other machinery, plant and equipment 53,396 58,997    
Site Closure 12,056 12,967    
Right-of-use assets 8,066   $ 45,115  
Piping 96,402 98,498    
Pond 41,319 42,903    
Well 238,670 250,045    
Parts 45,287 47,860    
Total 877,326 923,898    
Gross carrying amount [member]        
Property, plant and equipments [Abstract]        
Land 23,620 24,695    
Buildings 695,316 648,719    
Other property, plant and equipment 257,206 245,731    
Transport equipment 16,036 11,668    
Suppliers and accessories 25,531 24,456    
Office equipment 11,441 11,377    
Network and communication equipment 8,009 7,505    
Mining assets 161,619 132,309    
IT equipment 28,693 29,955    
Energy generating assets 38,495 36,930    
Construction in progress 375,316 207,830    
Machinery, plant and equipment 3,154,435 3,068,862    
Total 4,795,717 4,450,037   4,225,199
Description of classes of property, plant and equipment [Abstract]        
Total 3,154,435 3,068,862    
Accumulated depreciation and amortisation [member]        
Property, plant and equipments [Abstract]        
Buildings (442,347) (409,911)    
Other property, plant and equipment (224,602) (217,556)    
Transport equipment (9,994) (8,776)    
Suppliers and accessories (20,952) (19,734)    
Office equipment (11,021) (10,864)    
Network and communication equipment (7,346) (6,813)    
Mining assets (138,445) (120,808)    
IT equipment (24,334) (24,975)    
Energy generating assets (32,497) (30,813)    
Machinery, plant and equipment (2,277,109) (2,144,964)    
Total (3,188,647) (2,995,214)   $ (2,795,845)
Description of classes of property, plant and equipment [Abstract]        
Total $ (2,277,109) $ (2,144,964)