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COMMITMENTS AND CONTINGENCIES: - Labor matters (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 14, 2023 | Feb. 28, 2025 USD ($) item | Dec. 31, 2024 USD ($) item | Sep. 30, 2025 item employee | Jun. 30, 2025 item
Ilo and Cuajone |  |  |  |  |
Labor matters |  |  |  |  |
Number of labor unions |  |  |  | 6 |
Peru | Labor Matters |  |  |  |  |
Labor matters |  |  |  |  |
Percentage of labor unionized |  |  |  | 52.60% |
Total number of workers | employee |  |  |  | 5,294 |
Number of labor unions |  |  | 6 | 6 |
Number of labor unions represent majority of workers |  |  |  | 0 |
Number of labor unions of collective agreement signed |  |  | 5 |  | 6
Extended term of agreement |  | 3 years | 6 years |  |
Total signing payments | $ |  | $ 6.3 | $ 62.0 |  |
Number of meetings with the unions to discuss different issues of collective interest |  | 6 |  |  |
Mexico |  |  |  |  |
Labor matters |  |  |  |  |
Threshold days to resume activities | 15 days |  |  |  |

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