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Related parties - Additional Information (Details)
$ in Thousands

12 Months Ended

Dec. 31, 2019

USD ($)

Dec. 31, 2018

USD ($)

Freeport Minerals Corporation [Member]

Disclosure Of Related Party Explanatory [Line Items]

Amounts payable, related party transactions

$ 10,441

$ 8,860

Sociedad Minera Cerro Verde S.A.A. [Member]

Disclosure Of Related Party Explanatory [Line Items]

Description of basis for determining transaction price and type of delivery

at a price based on MWDO and under a delivery type known as CIF (cost, insurance and freight)

Amounts payable, related party transactions

$ 14,088

14,874

Amounts receivable, related party transactions

$ 453,070

$ 413,351

Benefits derived to key managerial personnel, Percentage

0.42

0.38

Sociedad Minera Cerro Verde S.A.A. [Member] | Stock option benefits [Member]

Disclosure Of Related Party Explanatory [Line Items]

Amounts payable, related party transactions

$ 10,100

$ 8,900

Sociedad Minera Cerro Verde S.A.A. [Member] | Freeport Minerals Corporation [Member]

Disclosure Of Related Party Explanatory [Line Items]

Amounts receivable, related party transactions

^[1]

401,211

409,688

Sociedad Minera Cerro Verde S.A.A. [Member] | Sumitomo Metal Mining Company, Ltd. [Member]

Disclosure Of Related Party Explanatory [Line Items]

Amounts receivable, related party transactions

^[2]

10,760

12,918

Sociedad Minera Cerro Verde S.A.A. [Member] | Climax Molybdenum Marketing Corporation [Member]

Disclosure Of Related Party Explanatory [Line Items]

Amounts receivable, related party transactions

^[3]

$ 5,022

$ 10,038

Sociedad Minera Cerro Verde S.A.A. [Member] | Copper concentrate [Member] | Sumitomo Metal Mining Company, Ltd. [Member] | Long-term contracts [member]

Disclosure Of Related Party Explanatory [Line Items]

Proportion of sales commitment made by entity, related party transactions

21.00%

Sociedad Minera Cerro Verde S.A.A. [Member] | Molybdenum concentrate [Member] | Climax Molybdenum Marketing Corporation [Member] | Long-term contracts [member]

Disclosure Of Related Party Explanatory [Line Items]

Proportion of sales commitment made by entity, related party transactions

100.00%

Bottom of range [member] | Sociedad Minera Cerro Verde S.A.A. [Member] | Copper concentrate [Member] | Freeport Minerals Corporation [Member] | Long-term contracts [member]

Disclosure Of Related Party Explanatory [Line Items]

Proportion of sales commitment made by entity, related party transactions

70.00%

Top of range [member] | Sociedad Minera Cerro Verde S.A.A. [Member] | Copper concentrate [Member] | Freeport Minerals Corporation [Member] | Long-term contracts [member]

Disclosure Of Related Party Explanatory [Line Items]

Proportion of sales commitment made by entity, related party transactions

80.00%

[1]	Accounts receivable from FMC mainly correspond to sales of copper concentrate and copper cathode. The Company has a long-term agreement with FMC through which it has committed to sell between 70% and 80% of its annual copper concentrate production through December 31, 2021. Terms of the contracts are reviewed annually.
[2]	The Company has a long-term agreement with Sumitomo through which it has committed to sell 21% of its annual copper concentrates production through December 31, 2021. Terms of the contracts are reviewed annually.
[3]	The Company has a long-term agreement with Climax Molybdenum Marketing Corporation (a wholly owned subsidiary of FMC) through which it has committed to sell 100% of its annual molybdenum concentrate production, at a price based on MWDO and under a delivery type known as CIF (cost, insurance and freight) through December 31, 2020.

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