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COMMITMENTS AND CONTINGENCIES: - Environmental matters (Details) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2011 category person
Environmental costs |  |  |
Environmental capital investment | $ 77.6 | $ 42.5 |
Peru |  |  |
Environmental costs |  |  |
Environmental capital investment | 5.5 | 7.1 |
Mexico |  |  |
Environmental costs |  |  |
Environmental capital investment | $ 72.1 | $ 35.4 |
Number of categories of collective actions | category |  |  | 3
Minimum number of people claiming injury due to collective action initiative in Civil Federal Procedures Code (CFPC) | person |  |  | 30

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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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