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Document and Entity Information Document | 12 Months Ended
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Dec. 31, 2020
Document and Entity Information [Abstract] |
Entity Registrant Name | ALAMOS GOLD INC
Entity Central Index Key | 0001178819
Document Type | 6-K
Current Fiscal Year End Date | --12-31
Document Fiscal Year Focus | 2020
Document Fiscal Period Focus | FY
Amendment Flag | false
Document Period End Date | Dec. 31, 2020

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