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COMMITMENTS AND CONTINGENCIES: - Litigation matters (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
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Mar. 31, 2022 lawsuit item | Sep. 30, 2016 lawsuit | Jun. 30, 2015 lawsuit item | Dec. 31, 2018 lawsuit | Dec. 31, 2015 lawsuit item | Dec. 31, 2017 lawsuit | Dec. 31, 2016 lawsuit
Litigation Matter |  |  |  |  |  |  |
Number of collective action lawsuits |  |  | 6 |  |  |  |
Number of subsidiaries against which lawsuits were filed | item |  |  | 2 |  |  |  |
Number of collective action lawsuits dismissed |  |  | 3 |  |  |  |
Number of lawsuits in process | 3 |  |  |  |  |  |
Number of civil actions seeking damages |  |  |  |  |  | 33 |
Number Of Constitutional Action Lawsuits |  |  |  |  | 4 |  |
Number of subsidiaries to which environmental impact authorizations were granted | item |  |  |  |  | 1 |  |
Tia Maria |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of lawsuits | 5 |  |  |  |  |  |
Buenavista del Cobre, S.A. de C.V |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of civil actions seeking damages |  |  |  | 3 | 8 |  | 3
Number of resolutions | 45 |  |  |  |  |  |
Francisca Garcia Enriquez |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  |  | 2 |  |
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  | 4 |  |  |  |  |
Mario Alberto Salcido et al; Maria Elena Heredia Bustamante et al; Martin Eligio Ortiz Gamez et al and Maria de los Angeles Enriquez Bacame et al | Mexico |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of monitoring wells downstream from the dam | item | 3 |  |  |  |  |  |
Period to submit Semarnat | 2 years |  |  |  |  |  |
Norberto Bustamante et al |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of additional constitutional lawsuits filed |  |  |  | 2 |  |  |
Acciones Colectivas de Sinaloa |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of lawsuits in process | 2 |  |  |  |  |  |
Defensa Colectiva |  |  |  |  |  |  |
Litigation Matter |  |  |  |  |  |  |
Number of lawsuits in process | 1 |  |  |  |  |  |

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