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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 |

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