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Basis for preparation, consolidation and accounting policies - Additional information (Details) |  | 12 Months Ended
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Jan. 01, 2017 | Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2016 USD ($)
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Useful lives or depreciation of Investment property |  | 20 years |  |  |
Impairment loss |  |  |  |  | $ 0
Workers' profit sharing rate |  | 8.00% |  |  |
Qualifying asset, description |  | The Group defines a qualifying asset as one which value is greater than US$5 million and requires a longer period to 12 months to get ready for its intended use. |  |  |
Applicable tax rate | 29.50% | 32.00% | 32.00% | 32.00% |
Lease Liabilities |  | $ 7,839,000 | $ 7,503,000 |  |
Right-of-use assets |  | $ 7,178,000 | $ 6,185,000 |  |
Lease term |  | 10 years |  |  |
Maximum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Normal credit term |  | 90 days |  |  |
Mining Royalties Marginal Rate |  | 12.00% |  |  |
Useful life of intangible assets |  | 10 years |  |  |
Minimum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Normal credit term |  | 30 days |  |  |
Mining Royalties Marginal Rate |  | 1.00% |  |  |
Useful life of intangible assets |  | 1 year |  |  |
Written put options [member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Closing foreign exchange rate |  | 0.2759 | 0.2959 |  |
Purchased call options [member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Closing foreign exchange rate |  | 0.2764 | 0.2968 |  |
Minera Yanacocha SRL and subsidiary [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Applicable tax rate | 29.50% | 29.50% | 29.50% | 29.50% |
Lease Liabilities |  | $ 330,000 | $ 596,000 |  |
Interest from short-term money market funds and interest from current bank accounts |  | $ 8,100,000 | 18,430,000 | $ 11,448,000 |
Terminal compensation percentage |  | 1.50% |  |  |
Maximum severance payments | item |  | 12 |  |  |
Amortization expense of intangible assets |  | $ 3,000,000 | $ 3,000,000 | $ 4,100,000 |
Minera Yanacocha SRL and subsidiary [Member] | Maximum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Mining Royalties Marginal Rate |  | 12.00% |  |  |
Minera Yanacocha SRL and subsidiary [Member] | Minimum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Mining Royalties Marginal Rate |  | 1.00% |  |  |
Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Workers' profit sharing rate |  | 8.00% |  |  |
Applicable tax rate |  | 32.00% | 32.00% | 32.00% |
Right-of-use assets |  | $ 76,862,000 | $ 84,856,000 | $ 95,728,000 |
Amortization expense of intangible assets |  | $ 1,000,000 | $ 1,000,000 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] | Concessions related to the operation of the port terminal |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Useful life of intangible assets |  | 20 years |  |  |
Sociedad Minera Cerro Verde S.A.A. [Member] | Written put options [member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Closing foreign exchange rate |  | 3.624 | 3.317 |  |
Sociedad Minera Cerro Verde S.A.A. [Member] | Purchased call options [member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Closing foreign exchange rate |  | 3.618 | 3.311 |  |
Plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member] | Maximum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Lease term |  | 10 years |  |  |
Plant and equipment [Member] | Minera Yanacocha SRL and subsidiary [Member] | Minimum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Lease term |  | 3 years |  |  |
Buildings and other constructions |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Lease Liabilities |  | $ 3,971,000 | $ 5,296,000 |  |
Right-of-use assets |  | $ 3,370,000 | $ 4,602,000 |  |
Buildings and other constructions | Minera Yanacocha SRL and subsidiary [Member] | Maximum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Lease term |  | 10 years |  |  |
Buildings and other constructions | Minera Yanacocha SRL and subsidiary [Member] | Minimum [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Lease term |  | 5 years |  |  |
OSINERGMIN [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Contribution rate on sales invoice value |  | 0.14% | 0.13% | 0.14% |
OEFA [Member] | Sociedad Minera Cerro Verde S.A.A. [Member] |  |  |  |  |
Basis for preparation, consolidation and accounting policies |  |  |  |  |
Contribution rate on sales invoice value |  | 0.10% | 0.11% |  |

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