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SUMMARY OF MATERIAL ACCOUNTING POLICIES - Principles of consolidation (Details)	12 Months Ended
	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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