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v3.21.1

Commitments and contingencies - Associates - Cerro Verde (Details) $ in Millions, S/ in Billions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 05, 2021 installment | Jun. 23, 2004 | Dec. 31, 2020 PEN (S/) installment | Dec. 31, 2020 USD ($) installment
SUNAT |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Number Of Equal Monthly Payments | installment | 66 |  |  |
SUNAT | Sociedad Minera Cerro Verde S.A.A. [Member] | December 2006 to December 2013 |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Amount of the assessment, including interest and penalties |  |  | S/ 2.8 | $ 771.2
Deferred Interest, Interest And Penalties | $ |  |  |  | $ 496.5
Number Of Equal Monthly Payments | installment |  |  | 66 | 66
Payment of Litigation Settlement Amount |  |  | S/ 1.6 | $ 476.7
Payment of litigation amount on exchange rate basis | $ |  |  |  | $ 435.2
Minimum | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Royalty rate on net sales |  | 1.00% |  |
Maximum | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Royalty rate on net sales |  | 3.00% |  |
New guarantee contract | Minimum | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Royalty rate on net sales |  | 1.00% |  |
New guarantee contract | Maximum | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |
Disclosure of Commitments and contingencies [Line Items] |  |  |  |
Royalty rate on net sales |  | 12.00% |  |

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