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Document and Entity Information Document
12 Months Ended
Dec. 31, 2022
Document and Entity Information [Abstract]  
Entity Registrant Name ALAMOS GOLD INC
Entity Central Index Key 0001178819
Document Type 40-F
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2022
Document Fiscal Period Focus FY
Amendment Flag false
Document Period End Date Dec. 31, 2022