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Cover
 12 Months Ended
Dec. 31, 2023
shares
Document Information [Line Items]  
Document Type 40-F
Document Registration Statement false
Document Annual Report true
Document Period End Date Dec. 31, 2023
Entity File Number 001-35783
Entity Registrant Name ALAMOS GOLD INC.
Entity Address, Address Line One Brookfield Place, 181 Bay Street, Suite 3910
Entity Address, City or Town Toronto
Entity Address, State or Province ON
Entity Address, Country CA
Entity Address, Postal Zip Code M5J 2T3
City Area Code 416
Local Phone Number 368-9932
Title of 12(b) Security Class A Common Shares, Without Par Value
Trading Symbol AGI
Security Exchange Name NYSE
Annual Information Form true
Audited Annual Financial Statements true
Entity Common Stock, Shares Outstanding 396,956,984
Entity Interactive Data Current Yes
Entity Current Reporting Status Yes
Entity Emerging Growth Company false
ICFR Auditor Attestation Flag true
Document Financial Statement Error Correction [Flag] false
Entity Central Index Key 0001178819
Current Fiscal Year End Date --12-31
Document Fiscal Year Focus 2023
Document Fiscal Period Focus FY
Amendment Flag false
Entity Incorporation, State or Country Code Z4
Business Contact  
Document Information [Line Items]  
Entity Address, Address Line One 1114 Avenue of the Americas23rd Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10036
City Area Code 212
Local Phone Number 880-6000
Contact Personnel Name Mile T. Kurta