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Related parties (Details Textual) - USD ($)
$ in Thousands

12 Months Ended

Dec. 31, 2018

Dec. 31, 2017

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 the Metals Week Dealer Oxide price and under a delivery type known as CIF (cost, insurance and freight)

Amounts payable, related party transactions

$ 14,874

$ 13,681

Amounts receivable, related party transactions

413,351

477,419

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

Disclosure Of Related Party Explanatory [Line Items]

Amounts payable, related party transactions

8,900

8,100

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

Disclosure Of Related Party Explanatory [Line Items]

Amounts payable, related party transactions

8,860

8,470

Amounts receivable, related party transactions

^[1]

409,688

372,327

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]

12,918

19,900

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]

$ 10,038

19,570

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

Disclosure Of Related Party Explanatory [Line Items]

Proportion of sales commitment made by entity, related party transactions

70.00%

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

Disclosure Of Related Party Explanatory [Line Items]

Proportion of sales commitment made by entity, related party transactions

80.00%

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%

Embedded derivatives [Member]

Disclosure Of Related Party Explanatory [Line Items]

Amounts receivable, related party transactions

$ 19,300

$ 65,600

[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 the Metals Week Dealer Oxide price and under a delivery type known as CIF (cost, insurance and freight) through December 31, 2020.

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