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Subsidiaries with material non-controlling interest - Statements of cash flow (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | $ (122,885) | $ (47,065) | $ (346,260)
Investing activities | (62,224) | (105,601) | (117,559)
Financing activities | (35,258) | (100,618) | (74,052)
Increase in cash and cash equivalents in the year | 25,403 | (159,154) | 154,649
Sociedad Minera El Brocal S.A.A |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 53,304 | 1,545 | 74,985
Investing activities | (24,699) | (28,259) | (29,546)
Financing activities | (1,954) | (405) | (29,974)
Increase in cash and cash equivalents in the year | 26,651 | (27,119) | 15,465
Minera La Zanja S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | (5,751) | (908) | 10,323
Investing activities | (825) | (1,629) | (13,160)
Financing activities | 0 | (763) | 0
Increase in cash and cash equivalents in the year | (6,576) | (3,300) | (2,837)
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | 13,738 | 16,040 | 14,066
Investing activities | 0 | 0 | 0
Financing activities | (12,850) | (16,250) | (13,900)
Increase in cash and cash equivalents in the year | 888 | (210) | 166
Apu Coropuna S.R.L. [Member] |  |  |
Disclosure Of Subsidiaries with material non-controlling interest [Line Items] |  |  |
Operating activities | (74) | 0 | (572)
Investing activities | 0 | 0 | 0
Financing activities | 0 | 1,032 | 0
Increase in cash and cash equivalents in the year | $ (74) | $ 1,032 | $ (572)

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- Definition The cash flows from (used in) financing activities, which are activities that result in changes in the size and composition of the contributed equity and borrowings of the entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 10 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_10&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2020-01-01 -Paragraph 50 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2020-en-r&anchor=para_50_d&doctype=Standard -URIDate 2020-01-01 + Details
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