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INCOME TAXES: (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Taxes
Statutory income tax provision	$ 511.6	$ 427.3
Peruvian royalty	17.0	11.6
Mexican royalty	58.0	47.4
Peruvian special mining tax	25.5	21.2
Total income tax provision	$ 612.1	$ 507.5
Effective income tax rate (as a percent)	43.80%	40.10%
Unrecognized tax benefits	$ 22.1
Peru
Income Taxes
Increase (Decrease) in Income tax expense (benefit)	33.8
Royalty charges	42.5	$ 32.8
Mexico
Income Taxes
Mexican royalty	$ 58.0	$ 47.4

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