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Financial obligations - Additional information (Details) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 29, 2020 USD ($) | Jul. 30, 2020 USD ($) | Apr. 30, 2020 USD ($) | Oct. 29, 2019 USD ($) | Jun. 27, 2016 USD ($) | Jun. 30, 2014 USD ($) | Apr. 30, 2020 | Apr. 30, 2018 | Jun. 27, 2016 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Oct. 29, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 02, 2009 USD ($)
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank loans |  |  |  |  |  |  |  |  |  |  | $ 55,000,000 | $ 65,793,000 | $ 95,000,000 |  | $ 95,000,000 |
Equity |  |  |  |  |  |  |  |  |  |  | $ 2,968,200,000 | $ 2,799,857,000 | $ 3,029,565,000 |  | $ 3,063,627,000 |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 2.00% | 1.65% |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  | 2.95% | 3.70% |  |  |  |
LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  | 2.15% |  |  |  |  |
Spread on variable interest rate |  |  |  |  |  |  |  |  |  |  | 2.15% |  |  |  |  |
Compaa de Minas Buenaventura S.A.A. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 275,000,000 |  |  |  | $ 275,000,000 |  | $ 275,000,000 | $ 275,000,000 |  |  |  |
Borrowings, interest rate basis |  |  |  |  |  |  |  |  | Three-month LIBOR plus 3% |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  | 3.00% |  |  |  | 3.00% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  | June 30, 2021 |  |  |  |  |  |  |  |  |  |  |
Borrowings Modified Repayment Terms |  |  |  |  | six semiannual installments |  |  |  |  |  |  |  |  |  |  |
Borrowings Periodic Repayment Amount |  |  |  |  | $ 39,285,714 |  |  |  | $ 39,285,714 |  |  |  |  |  |  |
Final installment |  |  |  |  | $ 39,285,716 |  |  |  |  |  |  |  |  |  |  |
Grace Period |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate |  |  |  |  | 3.00% |  |  |  | 3.00% |  |  |  |  |  |  |
Compaa de Minas Buenaventura S.A.A. [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  |  |
Equity |  |  |  |  | $ 2,711 |  |  |  | $ 2,711 |  |  |  |  |  |  |
Compaa de Minas Buenaventura S.A.A. [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  |  | 3.0 |  |  |  |  |  |  |  |  |  |  |
Banco De Credito Del Peru - New Financial Obligation [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 161,893,850 |  |  |  |  |  |  |  |  |  |  |  |
Bank loans |  |  |  |  |  |  |  |  |  |  |  | 10,793,000 |  |  |  |
Deferred periodic payment |  | $ 5,396,000 | $ 5,396,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Banco De Credito Del Peru - New Financial Obligation [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  | 1.3 |  |  |  |  |  |  |  |  |  |  |  |
Banco De Credito Del Peru - New Financial Obligation [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Leverage ratio |  |  |  | 1.0 |  |  |  |  |  |  |  |  |  |  |  |
Indebtedness ratio |  |  |  | 2.25 |  |  |  |  |  |  |  |  |  |  |  |
Banco De Credito Del Peru - New Financial Obligation Maturing on October 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 113,325,695 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.76% |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  | October 2024 |  |  |  |  |  |  |  |  |  |  |  |
Banco De Credito Del Peru - New Financial Obligation Maturing on October 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 48,568,155 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate basis |  |  |  | Three-month LIBOR plus 2.39 percent |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 2.39% |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  | October 2026 |  |  |  |  |  |  |  |  |  |  |  |
Spread on variable interest rate |  |  |  | 2.39% |  |  |  |  |  |  |  |  |  |  |  |
Banco de Credito del Peru [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 103,373,000 |  |  |  | $ 103,373,000 | $ 61,667,000 | $ 66,667,000 |  | $ 119,000,000 |  |
Borrowings, interest rate basis |  |  |  |  |  | LIBOR 30 days plus 2.10 percent (three -month LIBOR plus 2.75 percent |  |  |  |  | LIBOR 30 days plus 2.10 percent (three -month LIBOR plus 2.75 percent |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  | 2.75% |  |  |  | 2.75% | 2.75% |  |  |  |  |
Borrowings, maturity |  |  |  |  |  | November 2020 |  |  |  |  | November 2020 |  |  |  |  |
Final installment | $ 44,191,000 |  |  |  |  | $ 68,905,000 |  |  |  | $ 68,905,000 | $ 44,191,000 |  |  |  |  |
Spread on variable interest rate |  |  |  |  |  | 2.75% |  |  |  | 2.75% | 2.75% |  |  |  |  |
Banco de Credito del Peru [member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  |  |  |  |  | 1.1 |  |  |  |  |
Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000,000
Syndicated Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  |  |  | 5 years | 4 years |  |  |  |  |  |  |  |
Number of semi-annual installments |  |  |  |  |  |  |  |  |  |  | 41,200,000 |  |  |  |  |
Periodic payment |  |  |  |  |  |  |  |  |  |  | $ 55,000,000 |  |  |  |  |
Final payment |  |  |  |  |  |  |  |  |  |  | $ 68,750,000 |  |  |  |  |
Syndicated Term Loan | LIBOR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of Financial obligations [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  |  |  |  |  |  | 1.90% |  |  |  |  |
Spread on variable interest rate |  |  |  |  |  |  |  |  |  |  | 1.90% |  |  |  |  |

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