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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Environmental costs |  |
Environmental capital investment | $ 42.0 | $ 43.7
Peru |  |
Environmental costs |  |
Environmental capital investment | 1.5 | 1.6
Mexico |  |
Environmental costs |  |
Environmental capital investment | $ 40.5 | $ 42.1

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- Definition Amount of environmental remediation costs capitalized. These expenditures may relate to long-lived improvements in operating facilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 30 -Name Accounting Standards Codification -Section 25 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482049/410-30-25-18 + Details
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