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Derivative financial instruments - Composition of open transactions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) lb	Dec. 31, 2020 USD ($) lb	Dec. 31, 2019 USD ($)
Disclosure of derivative financial instruments [Line Items]
Fair value	$ (6,976)	$ (18,439)
Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	20,000	20,750
Fair value	$ (6,332)	$ (15,804)
Settlement period one [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	3,250	1,250
Fixed Quotation	$ 9,405	$ 6,500
Future quotation	9,748	7,758
Fair value	$ (1,112)	$ (1,572)
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
Fair value	$ (65)
Settlement period one [Member] | Minimum
Disclosure of derivative financial instruments [Line Items]
Fixed Quotation			$ 6,500
Settlement period two [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	2,000	1,250
Fixed Quotation	$ 9,444	$ 6,500
Future quotation	9,740	7,762
Fair value	$ (591)	$ (1,577)
Settlement period two [Member] | Minimum
Disclosure of derivative financial instruments [Line Items]
Fixed Quotation			$ 6,500
Settlement period three [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	2,000	2,250
Fixed Quotation	$ 9,525	$ 6,633
Future quotation	9,732	7,767
Fair value	$ (413)	$ (2,549)
Settlement period four [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	2,700	2,000
Fixed Quotation	$ 9,103	$ 6,750
Future quotation	9,719	7,769
Fair value	$ (1,661)	$ (2,036)
Settlement period five [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	3,050	3,000
Fixed Quotation	$ 9,175	$ 6,897
Future quotation	9,701	7,769
Fair value	$ (1,601)	$ (2,615)
Settlement period six [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	1,000	3,000
Fixed Quotation	$ 9,425	$ 6,967
Future quotation	9,686	7,770
Fair value	$ (260)	$ (2,408)
Settlement period seven [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	3,000	2,000
Fixed Quotation	$ 9,442	$ 7,025
Future quotation	9,676	7,768
Fair value	$ (701)	$ (1,483)
Settlement period eight [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb		2,000
Fixed Quotation		$ 7,100
Future quotation		7,765
Fair value		$ (1,327)
Settlement period nine [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb		2,000
Fixed Quotation		$ 7,500
Future quotation		7,762
Fair value		$ (523)
Settlement period ten [Member] | Copper Price Hedging Instrument [Member]
Disclosure of derivative financial instruments [Line Items]
Quantity of commodity | lb	1,500	2,000
Fixed Quotation	$ 9,762	$ 7,900
Future quotation	9,631	7,757
Fair value	$ 196	$ 286
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
Fair value	$ (124)

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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 2021-01-01
-Paragraph 22
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_22_b&doctype=Standard&book=b
-URIDate 2021-03-24

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