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Significant accounting policies (Tables)

12 Months Ended

Dec. 31, 2022

Significant accounting policies

Schedule of foreign exchange rates used to translate monetary items

The main exchange rates and UF used to translate monetary assets and liabilities, expressed in foreign currency at the end and average of each period in respect to U.S. dollars, are as follows:



		Closing exchange rates				Average exchange rates
		As of		As of		As of		As of
		December 31,		December 31,		December 31,		December 31,
Currencies		2022		2021		2022		2021
		ThUS$		ThUS$		ThUS$		ThUS$
Brazilian real		5.28		5.57		5.25		5.66
New Peruvian sol		3.81		3.99		3.83		4.04
Japanese yen		131.32		115.18		134.70		113.87
Euro		0.93		0.88		0.94		0.88
Mexican peso		19.50		20.54		19.60		20.90
Australian dollar		1.47		1.38		1.48		1.40
Pound Sterling		0.83		0.74		0.82		0.75
South African rand		17.01		15.94		17.28		15.88
Chilean peso		855.86		844.69		873.81		849.46
Chinese yuan		6.92		6.38		6.98		6.37
Indian rupee		82.73		74.42		82.52		75.40
Thai Baht		34.64		33.32		34.76		33.55
Turkish lira		18.71		13.28		18.66		13.54
Korean Won		1,259.98		1,188.79		1,291.64		1,183.95
Indonesian Rupiah		15,570.00		14,265.00		15,596.90		14,320.57
United Arab Emirates dirham		3.67		3.67		3.67		3.67
Polish Zloty		4.37		4.06		4.42		4.08
UF (*)		41.02		36.69		40.18		36.48

Schedule of useful lives of property, plant and equipment

The useful lives used for the depreciation and amortization of assets included in property, plant and equipment in years are presented below:


		Minimum life or		Maximum life or		Life or average rate
Classes of property, plant and equipment		rate (years)		rate (years)		in years
Mining assets		3		10		8
Energy generating assets		5		16		10
Buildings		3		25		13
Supplies and accessories		4		10		8
Office equipment		5		10		9
Transport equipment		8		9		9
Network and communication equipment		4		12		8
IT equipment		5		10		8
Machinery, plant and equipment		3		25		10
Other fixed assets		3		15		9

Schedule of useful lives of intangible assets

Minimum and maximum amortization lives or rates of intangible assets:


		Minimum Life or		Maximum Life or
Estimated useful life or amortization rate		Rate		Rate
Water rights		5 years		Indefinite
Rights of way		Indefinite		Indefinite
Corfo Mining properties (1)		8 years		8 years
Mining rights		Unit-production method
Intellectual property		9 years		9 years
IT programs		3 years		9 years

Schedule of basic and diluted earnings per share


		For the year ended December 31
Earnings per Share		2022		2021		2020
Profit attributable to the owners of the parent (ThUS$)		3,906,311		585,454		164,518
Weighted average number of shares		285,638,456		278,157,812		263,196,524
Basic earnings per share (US$)		13.6757		2.1048		0.6251
Profit attributable to the owners of the parent (ThUS$)		3,906,311		585,454		164,518
Weighted average number of shares		285,638,456		278,157,812		263,196,524
Diluted earnings per share (US$)		13.6757		2.1048		0.6251

Series A common shares		142,819,552		142,819,552		142,819,552
Series B common shares		142,818,904		135,338,260		120,376,972
Total weighted average number of shares		285,638,456		278,157,812		263,196,524