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v3.20.1

Contingencies and Capital Commitments (Narrative) (Details) S/ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 PEN (S/) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 | Jan. 31, 2020 USD ($)
Disclosure of other provisions [line items] |  |  |  |  |
Security bond |  | $ 1,300,000 |  |  |
Bank letter of guarantee |  | 8,394,000 |  |  |
Capital commitments |  | 24,467,000 | $ 111,940,000 |  |
Tax expense (income) |  | 20,175,000 | 33,350,000 |  |
SGM Royalty (as percentage) |  |  |  | 3.00% |
Proposal Of Cancelling Mining Concession [Member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Claimed Royalty |  |  |  |  | $ 30,000,000
PERU |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Tax expense (income) | S/ 4,343 | 1,310,000 |  |  |
Income tax interest and penalties | 2,405 | 725,000 |  |  |
Payment of disputed amount | S/ 4,343 | 1,310,000 |  |  |
Mineral Properties [member] | Civil Work [Member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Capital commitments |  | 36,454,000 |  |  |
Mineral Properties [member] | Equipment Purchases [Member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Capital commitments |  | 510,000 |  |  |
Mineral Properties [member] | Other Services [Member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Capital commitments |  | 124,000 |  |  |
Caylloma Mine [Member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Undiscounted closure costs |  |  | 11,431,000 |  |
Progressive closure activities |  |  | 3,646,000 |  |
Final closure activities |  |  | 7,156,000 |  |
Post closure activities |  |  | $ 790,000 |  |
Guarantees with government current year |  | 7,237,000 |  |  |
Guarantees with government next year |  | 9,704,000 |  |  |
San Jose Mine [Member] | Environmental obligations [Member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Bank letter of guarantee |  | $ 1,236,000 |  |  |
Number of letters of guarantee |  | 3 |  |  |
Provision for credit commitments [member] |  |  |  |  |
Disclosure of other provisions [line items] |  |  |  |  |
Bank letter of guarantee |  | $ 7,237,000 |  |  |

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