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Derivative financial instruments - Composition of open transactions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) lb | Dec. 31, 2021 USD ($) lb | Dec. 31, 2020 USD ($)
Disclosure of derivative financial instruments [Line Items] |  |  |
Financial instruments designated as hedging instruments, at fair value | $ 8,839 | $ 6,976 |
Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 20,000 | 5,000 |
Financial instruments designated as hedging instruments, at fair value | $ 6,332 | $ 8,839 |
Settlement period one [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 3,250 | 2,000 |
Fixed Quotation | $ 9,405 | $ 10,185 |
Future quotation | 9,748 | 8,344 |
Financial instruments designated as hedging instruments, at fair value | $ 1,112 | $ 4,332 |
Settlement period one [Member] | Zinc Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 500 |  |
Fixed Quotation | $ 3,450 |  |
Future quotation | 9,748 |  |
Financial instruments designated as hedging instruments, at fair value | $ 65 |  |
Settlement period one [Member] | Minimum |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Fixed Quotation |  |  | $ 10,185
Settlement period two [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 2,000 | 1,500 |
Fixed Quotation | $ 9,444 | $ 10,109 |
Future quotation | 9,740 | 8,350 |
Financial instruments designated as hedging instruments, at fair value | $ 591 | $ 1,867 |
Settlement period two [Member] | Minimum |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Fixed Quotation |  |  | $ 10,109
Settlement period three [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 2,000 | 1,500 |
Fixed Quotation | $ 9,525 | $ 10,153 |
Future quotation | 9,732 | 8,353 |
Financial instruments designated as hedging instruments, at fair value | $ 413 | $ 2,640 |
Settlement period four [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 2,700 |  |
Fixed Quotation | $ 9,103 |  |
Future quotation | 9,719 |  |
Financial instruments designated as hedging instruments, at fair value | $ 1,661 |  |
Settlement period five [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 3,050 |  |
Fixed Quotation | $ 9,175 |  |
Future quotation | 9,701 |  |
Financial instruments designated as hedging instruments, at fair value | $ 1,601 |  |
Settlement period six [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 1,000 |  |
Fixed Quotation | $ 9,425 |  |
Future quotation | 9,686 |  |
Financial instruments designated as hedging instruments, at fair value | $ 260 |  |
Settlement period seven [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 3,000 |  |
Fixed Quotation | $ 9,442 |  |
Future quotation | 9,676 |  |
Financial instruments designated as hedging instruments, at fair value | $ 701 |  |
Settlement period ten [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 1,500 |  |
Fixed Quotation | $ 9,762 |  |
Future quotation | 9,631 |  |
Financial instruments designated as hedging instruments, at fair value | $ (196) |  |
Settlement period twelve [Member] | Copper Price Hedging Instrument [Member] |  |  |
Disclosure of derivative financial instruments [Line Items] |  |  |
Quantity of commodity | lb | 1,000 |  |
Fixed Quotation | $ 9,475 |  |
Future quotation | 9,600 |  |
Financial instruments designated as hedging instruments, at fair value | $ 124 |  |

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- Definition The fair value of financial instruments designated as hedging instruments. Hedging instruments are designated derivatives or (for a hedge of the risk of changes in foreign currency exchange rates only) designated non-derivative financial assets or non-derivative financial liabilities whose fair value or cash flows are expected to offset changes in the fair value or cash flows of a designated hedged item. [Refer: At fair value [member]; Derivatives [member]; Derivative financial assets; Derivative financial liabilities; Financial instruments, class [member]; Financial assets; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 22 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b -URIDate 2022-03-24 + Details
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