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Document and Entity Information Document
 12 Months Ended
Dec. 31, 2018
shares
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 2018
Document Fiscal Period Focus FY
Amendment Flag false
Document Period End Date Dec. 31, 2018
Entity Common Stock, Shares Outstanding 389,074,406
Entity Current Reporting Status Yes
Entity Emerging Growth Company false