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Significant accounting policies (Details 2)	12 Months Ended
	Dec. 31, 2020
Water rights and rights of way [member] | Bottom of range [member]
Significant accounting policies [Line Items]
Description of useful life, intangible assets other than goodwill	Indefinite
Water rights and rights of way [member] | Top of range [member]
Significant accounting policies [Line Items]
Description of useful life, intangible assets other than goodwill	Indefinite
Mining rights granted by Corfo [member] | Bottom of range [member]
Significant accounting policies [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	10 years
Mining rights granted by Corfo [member] | Top of range [member]
Significant accounting policies [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	10 years
Mining rights [member]
Significant accounting policies [Line Items]
Description of useful life, intangible assets other than goodwill	Unit-production method
IT programs [member] | Bottom of range [member]
Significant accounting policies [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	2 years
IT programs [member] | Top of range [member]
Significant accounting policies [Line Items]
Useful life measured as period of time, intangible assets other than goodwill	8 years

X

- Definition

Description of useful life used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2020-01-01
-Paragraph 118
-Subparagraph a
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-URIDate 2020-01-01

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- Definition

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+ References

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-URIDate 2020-01-01

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