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INCOME TAXES: - Tax assets and liabilities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Assets:    
Inventories $ 52.4 $ 28.5
Capitalized exploration expenses 15.6 12.4
U.S. foreign tax credit carryforward, net of Uncertain Tax Positions 1,904.1 1,653.5
U.S. tax effect of Peruvian deferred tax liability 83.5 112.5
U.S. tax effect of Peruvian Uncertain Tax Positions 69.6 45.1
Reserves 315.4 249.6
Deferred workers participation 12.2 15.9
Accrued salaries, wages and vacations 7.7 7.4
Sales price adjustment (PUI) (0.3)  
Deferred charges   28.6
Valuation allowance on U.S. deferred tax assets, foreign tax credits and U.S. tax effect of Peruvian deferred (2,301.7) (2,053.7)
Accrued royalty and special mining tax 29.6 10.8
Other 16.5 21.9
Total deferred tax assets 204.6 132.5
Liabilities:    
Property, plant and equipment (68.1) (19.7)
Social responsibility expenses (9.7) (7.7)
Sales price adjustment (PUI)   (29.0)
Other (2.9)  
Total deferred tax liabilities (80.7) (56.4)
Total net deferred tax (liabilities) / assets 123.9 $ 76.1
Increase in valuation allowance $ 248.0