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Identification and business activity - Additional information (Details) oz in Thousands, lb in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 21, 2021 USD ($) | Dec. 31, 2020 USD ($) T lb oz | Dec. 31, 2019 USD ($) oz | Dec. 31, 2018 USD ($) oz
Identification and business activity |  |  |  |  |
Assets |  |  | $ 3,979,617,000 | $ 4,107,274,000 | $ 4,217,221,000
Decrease in sales |  |  | 191,300,000 |  |
Unabsorbed cost due to production stoppage |  |  | $ 27,758,000 | $ 0 | $ 0
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
Volume of gold produced | oz |  |  | 340,000 | 527,000 | 515,000
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: (i) the La Quinua Complex, (ii) the Yanacocha Complex, (iii) the Carachugo Complex and Maqui Maqui. In addition, The Company has (i) four leach pads (La Quinua, Yanacocha, Carachugo and Maqui Maqui), (ii) three gold processing plants (Pampa Larga, Yanacocha Norte and La Quinua), one limestone processing facility (China Linda) and (iv) one mill (Yanacocha Gold Mill). |  |
Assets |  |  | $ 2,313,438,000 | $ 2,312,072,000 |
Minera Yanacocha SRL and subsidiary [Member] | Conga Project [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
Assets |  |  | $ 449,800,000 | $ 458,200,000 |
Sociedad Minera Cerro Verde Saa [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
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 |  |
Sociedad Minera Cerro Verde Saa [Member] | Quecher Main project [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
Average production capacity | lb |  |  | 200 |  |
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% |  |
Mallay | Discontinued operations |  |  |  |  |
Identification and business activity |  |  |  |  |
Sale price, gross |  |  | $ 10,000,000 |  |
Sale price plus VAT |  |  | 8,500,000 |  |
Related cost on sale of investments |  |  | 3,600,000 |  |
Income from the reversal of provision for mining unit closure |  |  | 5,100,000 |  |
Proceeds collected |  |  | 2,000,000 |  |
Mallay | Discontinued operations | Less than 1 year |  |  |  |  |
Identification and business activity |  |  |  |  |
Remaining balance of proceeds receivable |  |  | 4,000,000 |  |
Mallay | Discontinued operations | Between 1 to 2 years |  |  |  |  |
Identification and business activity |  |  |  |  |
Remaining balance of proceeds receivable |  |  | $ 4,000,000 |  |
El Brocal | Mining activities [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
Proportion of voting rights held in subsidiary |  |  | 61.43% | 61.43% |
El Brocal | 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% |
Compaa Minera Condesa S.A | Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
Proportion of ownership interests held by non-controlling interests |  |  | 43.65% |  |
Compaa Minera Condesa S.A | 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% |  |
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% |  |
Compaa de Minas Buenaventura Chile Ltda. |  |  |  |  |
Identification and business activity |  |  |  |  |
Percentage of share capital sold |  | 100.00% |  |  |
Sale price |  | $ 30,000 |  |  |
Compaa de Minas Buenaventura Chile Ltda. | Mining activities [Member] | Indirect [Member] |  |  |  |  |
Identification and business activity |  |  |  |  |
Proportion of ownership interest in subsidiary | [1] |  | 10.00% | 10.00% |
[1] | (***) On January 21, 2021, the Company sold 100% of its shares of Compañía de Minas Buenaventura Chile Ltda., which were presented as financial investments as of December 31, 2020. The sale value was US$30,000 which are fully collected as of the date of this report.

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