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SIGNIFICANT ACCOUNTING POLICES (Disclosure of subsidiaries) (Details)
 12 Months Ended
Dec. 31, 2021
Minera Bateas S.A.C. [member]  
Disclosure of subsidiaries [line items]  
Name of subsidiary Minera Bateas S.A.C. ("Bateas")
Principal place of business of subsidiary Peru
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Caylloma Mine
Compania Minera Cuzcatlan S.A. de C.V. [member]  
Disclosure of subsidiaries [line items]  
Name of subsidiary Compania Minera Cuzcatlan S.A. de C.V. ("Cuzcatlan")
Principal place of business of subsidiary Mexico
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary San Jose Mine
Mansfield Minera S.A. [member]  
Disclosure of subsidiaries [line items]  
Name of subsidiary Mansfield Minera S.A. ("Mansfield")
Principal place of business of subsidiary Argentina
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Lindero Mine
Roxgold SANU S.A. ("Sanu") [Member]  
Disclosure of subsidiaries [line items]  
Name of subsidiary Roxgold SANU S.A. (“Sanu”)
Principal place of business of subsidiary Burkina Faso
Proportion of ownership interest in subsidiary 90.00%
Principal activity of subsidiary Yaramoko Mine
Principal activity of subsidiary Mining
Description of functional currency USD
Roxgold SANGO S.A. ("Sango") [Member]  
Disclosure of subsidiaries [line items]  
Name of subsidiary Roxgold SANGO S.A. (“Sango”)
Principal place of business of subsidiary Côte d’Ivoire
Proportion of ownership interest in subsidiary 90.00%
Principal activity of subsidiary Séguéla Exploration Project
Principal activity of subsidiary Exploration
Description of functional currency USD
Roxgold Burkina Faso S.A.R.L. [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Exploration
Description of functional currency USD
Roxgold Exploration S.A.R.L. [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Exploration
Description of functional currency USD
Roxgold Boussoura S. A. R. L. [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Exploration
Description of functional currency USD
FR Mining Limited [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Holding
Description of functional currency USD
FR Gold Limited [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Holding
Description of functional currency USD
Roxgold CI Limited [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Holding
Description of functional currency USD
Roxgold Boussoura [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Holding
Description of functional currency USD
Roxgold Inc. [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Holding
Description of functional currency CAD
FR Gold Mining Inc. [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Holding
Description of functional currency CAD
Fortuna Silver Mines Australia Pty Ltd. [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Corporate
Description of functional currency AUD
LGL Exploration Cte d'Ivoire SA [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Exploration
Description of functional currency XOF
LGL Resources Cte d'Ivoire SA [Member]  
Disclosure of subsidiaries [line items]  
Proportion of ownership interest in subsidiary 100.00%
Principal activity of subsidiary Exploration
Description of functional currency XOF