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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Principles of consolidation (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Sociedad Contractual Minera Puren |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in joint venture | 65.00% | 65.00%
Bald Mountain Exploration LLC |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in joint venture | 50.00% | 50.00%
Compania Minera Casale |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Percentage of ownership interest in associate |  | 25.00%
Fairbanks Gold Mining, Inc. |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Kinross Brasil Mineracao S.A. ("KBM") |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Compania Minera Maricunga |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Compania Minera Mantos de Oro |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Echo Bay Minerals Company |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Chukotka Mining and Geological |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Northern Gold LLC |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Selene Holdings LP |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary |  | 100.00%
Tasiast Mauritanie Ltd. S.A. |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Chirano Gold Mines Ltd. (Ghana) |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 90.00% | 90.00%
Ownership interest non controlling interest | 10.00% | 10.00%
KG Mining (Bald Mountain) Inc. |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%
Round Mountain Gold Corporation/KG Mining (Round Mountain) Inc. |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Ownership interest in subsidiary | 100.00% | 100.00%

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