XML 170 R147.htm IDEA: XBRL DOCUMENT v3.19.1
Property, plant and equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, plant and equipments [Abstract]      
Land $ 24,695 $ 24,900  
Buildings 238,808 230,319  
Other property, plant and equipment 28,175 24,862  
Transport equipment 2,892 3,257  
Suppliers and accessories 4,722 1,872  
Office equipment 513 487  
Network and communication equipment 692 1,050  
Mining assets 11,501 16,237  
IT equipment 4,980 3,401  
Energy generating assets 6,117 7,861  
Construction in progress 207,830 165,054  
Machinery, plant and equipment 923,898 950,054  
Total 1,454,823 1,429,354 $ 1,532,710
Description of classes of property, plant and equipment [Abstract]      
Pumps 34,145 33,614  
Conveyor belt 22,082 24,832  
Crystallizer 27,112 15,519  
Plant equipment 188,934 186,885  
Water tanks 14,876 11,296  
Filter 29,300 18,572  
Facilities or electrical equipment 96,179 105,600  
Other machinery, plant and equipment 71,964 72,812  
Piping 98,498 113,641  
Pond 250,045 275,731  
Well 42,903 46,802  
Parts 47,860 44,750  
Total 923,898 950,054  
Gross carrying amount [member]      
Property, plant and equipments [Abstract]      
Land 24,695 24,900  
Buildings 648,719 610,264  
Other property, plant and equipment 245,731 244,831  
Transport equipment 11,668 11,195  
Suppliers and accessories 24,456 19,498  
Office equipment 11,377 11,105  
Network and communication equipment 7,505 7,356  
Mining assets 132,309 129,028  
IT equipment 29,955 27,038  
Energy generating assets 36,930 36,643  
Construction in progress 207,830 165,054  
Machinery, plant and equipment 3,068,862 2,938,287  
Total 4,450,037 4,225,199 4,140,841
Description of classes of property, plant and equipment [Abstract]      
Total 3,068,862 2,938,287  
Accumulated depreciation and amortisation [member]      
Property, plant and equipments [Abstract]      
Buildings (409,911) (379,945)  
Other property, plant and equipment (217,556) (219,969)  
Transport equipment (8,776) (7,938)  
Suppliers and accessories (19,734) (17,626)  
Office equipment (10,864) (10,618)  
Network and communication equipment (6,813) (6,306)  
Mining assets (120,808) (112,791)  
IT equipment (24,975) (23,637)  
Energy generating assets (30,813) (28,782)  
Machinery, plant and equipment (2,144,964) (1,988,233)  
Total (2,995,214) (2,795,845) $ (2,608,131)
Description of classes of property, plant and equipment [Abstract]      
Total $ (2,144,964) $ (1,988,233)