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INCOME TAXES: (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Taxes
Statutory income tax provision	$ 399.0	$ 511.6
Peruvian royalty	9.8	17.0
Mexican royalty	51.7	58.0
Peruvian special mining tax	20.0	25.5
Total income tax provision	$ 480.5	$ 612.1
Effective income tax rate (as a percent)	36.90%	43.80%
Unrecognized tax benefits	$ 23.1
Peru
Income Taxes
Increase (Decrease) in Income tax expense (benefit)	6.9
Royalty charges	29.8	$ 42.5
Mexico
Income Taxes
Mexican royalty	$ 51.7	$ 58.0

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