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Identification and business activity - Additional information (Details)
lb in Thousands, $ in Thousands
 12 Months Ended 24 Months Ended
Dec. 31, 2019
USD ($)
T
lb
oz
Dec. 31, 2018
USD ($)
lb
Dec. 31, 2017
USD ($)
lb
Dec. 31, 2019
USD ($)
Identification and business activity        
Proceeds from sales of property, plant and equipment, classified as investing activities $ 726 $ 2,240 $ 1,962  
Processing Capacity | T 548,500      
Concentrator Facility Capacity | T 409,500      
Pre Expansion Capacity Approved | T 361,500      
Capacity of Crushed Leach Facility | T 39,000      
Run Of Mine Capacity | T 100,000      
Assets $ 4,107,274 4,217,221 $ 4,332,813 $ 4,107,274
Quecher Main project [Member]        
Identification and business activity        
Average production capacity | oz 200,000      
Development Capital costs $ 96,800     193,000
Conga Project [Member]        
Identification and business activity        
Assets $ 458,200 $ 484,500   458,200
Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Volume of gold produced | lb 527,000,000 515,000,000 660,000,000  
Description Of Location of Entity Operation In order to perform its activities, the Company is required to obtain mining concessions or provisional permits for exploration and processing concessions for the treatment of mining ores from the Peruvian Ministry of Energy and Mines ("MEM"). Under Peru's current legal and regulatory regime, these mining and processing rights are maintained by meeting a minimum annual level of production or investment and by the annual payment of a concession fee. A fine is payable for the years in which minimum production or investment requirements are not met. The Company holds mining concessions which exploration and processing rights do not expires as long as the Company comply with the legal requirements. To date the Company has complied with all the applicable legal requirements related to its concession rights.The Company's operations are located approximately 375 miles (604 kilometers) north of Lima and 30 miles (48 kilometers) north of the city of Cajamarca and are primarily accessible by paved roads. The Yanacocha property began production in 1993 and consists of the following open pit mines: the La Quinua Complex, the Yanacocha Complex, the Carachugo Complex and Maqui Maqui. In addition, The Company has four leach pads (La Quinua, Yanacocha, Carachugo and Maqui Maqui), three gold processing plants (Pampa Larga, Yanacocha Norte and La Quinua), one limestone processing facility (China Linda) and one mill (Yanacocha Gold Mill).      
Assets $ 2,312,072 $ 2,047,472   $ 2,312,072
Sociedad Minera Cerro Verde Saa [Member] | Quecher Main project [Member]        
Identification and business activity        
Average production capacity | lb 200,000      
Newmont Second Capital Corporation [Member] | Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Proportion of ownership interest in subsidiary 51.35%      
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] | Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Royalty rate on net sales 3.00%      
Newmont Mining Corporation [Member] | Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Proportion of ownership interest in subsidiary 100.00%      
Cyprus Climax Metals [Member] | Sociedad Minera Cerro Verde Saa [Member]        
Identification and business activity        
Proportion of ownership interest in subsidiary 53.56%      
SMM Cerro Verde Netherlands B.V [Member] | Sociedad Minera Cerro Verde Saa [Member]        
Identification and business activity        
Proportion of ownership interests held by non-controlling interests 21.00%      
Compania de Minas Buenaventura S.A.A. [Member] | Sociedad Minera Cerro Verde Saa [Member]        
Identification and business activity        
Proportion of ownership interests held by non-controlling interests 19.58%      
other stakeholders [Member] | Sociedad Minera Cerro Verde Saa [Member]        
Identification and business activity        
Proportion of ownership interests held by non-controlling interests 5.86%      
Mining activities [Member]        
Identification and business activity        
Losses on disposals of non-current assets   4,000    
Reversal of impairment loss   $ 11,800    
El Brocal [Member] | Mining activities [Member]        
Identification and business activity        
Proportion of voting rights held in subsidiary 61.43% 61.43%    
El Brocal [Member] | Mining activities [Member] | Indirect [Member]        
Identification and business activity        
Proportion of voting rights held in subsidiary 58.24% 58.24%    
Colquijirca S.A. [Member] | Mining activities [Member]        
Identification and business activity        
Proportion of voting rights held in subsidiary 99.99% 99.99%    
Compania Minera Condesa S.A. [Member] | Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Proportion of ownership interests held by non-controlling interests 43.65%      
Compania Minera Condesa S.A. [Member] | Mining activities [Member] | Indirect [Member]        
Identification and business activity        
Proportion of ownership interest in subsidiary 0.00% 0.00%    
Minas Buenaventura S.A.A [Member] | Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Proportion of ownership interest in subsidiary 100.00%      
Breapampa [Member] | Mining activities [Member]        
Identification and business activity        
Proceeds from sales of property, plant and equipment, classified as investing activities   $ 2,000    
Reversal of impairment loss   7,400    
Recuperada [Member] | Mining activities [Member]        
Identification and business activity        
Proceeds from sales of property, plant and equipment, classified as investing activities   600    
Reversal of impairment loss   $ 7,100    
Summit Global Management [Member] | Minera Yanacocha SRL and subsidiary [Member]        
Identification and business activity        
Proportion of ownership interests held by non-controlling interests 5.00%