XML 278 R199.htm IDEA: XBRL DOCUMENT v3.20.1
Net sales (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Sales of goods [Line Items]      
Revenue from sale of goods $ 821,930,000 $ 1,106,329,000 $ 1,187,206,000
Revenue from rendering of services 23,661,000 24,001,000 29,697,000
Gold 298,171,000 362,122,000 393,257,000
Silver 254,194,000 411,877,000 510,982,000
Copper 238,304,000 274,761,000 268,527,000
Zinc 149,317,000 164,666,000 170,518,000
Lead 89,141,000 85,555,000 85,957,000
Manganese sulfate 6,046,000 6,655,000 6,317,000
Revenue from sale of goods before commercial deductions 1,035,173,000 1,305,636,000 1,435,624,000
Commercial deductions (220,306,000) (192,684,000) (247,151,000)
Indium 0 0 66,000
Royalty income 22,297,000 20,385,000 20,739,000
Revenue from contracts with customers 860,825,000 1,157,338,000 1,238,909,000
Revenue 867,888,000 1,150,715,000 1,237,642,000
Contracts with customers for sale of goods 814,867,000 1,112,952,000 1,188,473,000
Hedge Operations 4,322,000 (1,398,000) (10,921,000)
Fair Value of accounts receivables. 2,347,000 (6,013,000) 8,417,000
Adjustments to prior period liquidations 394,000 788,000 1,237,000
Peru [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from rendering of services 23,501,000 23,712,000 14,903,000
Royalty income 22,297 20,385 20,739
Contracts with customers for sale of goods 476,978,000 521,017,000 516,054,000
America - other than Peru [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from rendering of services 130,000 289,000 14,794,000
Contracts with customers for sale of goods 171,769,000 370,624,000 471,863,000
Asia [Member]      
Disclosure of Sales of goods [Line Items]      
Contracts with customers for sale of goods 105,645,000 120,519,000 120,719,000
Europe [Member]      
Disclosure of Sales of goods [Line Items]      
Revenue from rendering of services 30,000    
Contracts with customers for sale of goods $ 60,475,000 $ 100,792,000 $ 79,837,000