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SUMMARY OF MATERIAL ACCOUNTING POLICIES - Principles of consolidation (Details) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Sociedad Contractual Minera Puren |  |
Principles of consolidation |  |
Ownership interest in joint venture | 65.00% | 65.00%
Tasiast Mauritanie Ltd. S.A. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Kinross Brasil Minerao S.A. ("KBM") |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Compania Minera Mantos de Oro |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Fairbanks Gold Mining, Inc. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Peak Gold, LLC |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 70.00% | 70.00%
Round Mountain Gold Corporation / KG Mining (Round Mountain) Inc. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
KG Mining (Bald Mountain) Inc. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Great Bear Resources Ltd. |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Compania Minera Maricunga ("CMM") |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%
Echo Bay Minerals Company |  |
Principles of consolidation |  |
Ownership interest in subsidiary (as a percentage) | 100.00% | 100.00%

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