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Major Group Investments Direct and Indirect - Summary of Share Held in Investments in Associates Joint Ventures other Equity Investments and Percentage of Beneficial Interest (Detail) - shares
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Rusoro Mining Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed associates, group beneficial interest 25.70% 25.70%  
Lunnon Metals Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed associates, group beneficial interest 31.65%    
Far Southeast Gold Resources Incorporated ("FSE")      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Interest in joint venture 40.00% 40.00% 40.00%
Listed equity investments | Galiano Gold Inc. (formerly Asanko Gold Inc.)      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 21,971,657 21,971,657  
Listed equity investments, group beneficial interest 9.80% 9.80%  
Listed equity investments | Bezant Resources PLC      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 0 17,945,922  
Listed equity investments, group beneficial interest 0.00% 0.60%  
Listed equity investments | Hamelin Gold Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 11,000,000 0  
Listed equity investments, group beneficial interest 10.00% 0.00%  
Listed equity investments | RareX Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 710,592 710,592  
Listed equity investments, group beneficial interest 0.20% 0.20%  
Listed equity investments | Consolidated Woodjam Copper Corporation      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 16,115,740 16,115,740  
Listed equity investments, group beneficial interest 13.30% 16.30%  
Listed equity investments | Lefroy Exploration Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 21,613,910 21,613,910  
Listed equity investments, group beneficial interest 15.00% 18.00%  
Listed equity investments | Magmatic Resources Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 19,200,000 19,200,000  
Listed equity investments, group beneficial interest 7.50% 10.90%  
Listed equity investments | Orsu Metals Corp      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 2,613,491 2,613,491  
Listed equity investments, group beneficial interest 6.00% 6.10%  
Listed equity investments | Chakana Copper Corp      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 22,270,791 15,686,275  
Listed equity investments, group beneficial interest 19.90% 16.80%  
Listed equity investments | Amarc Resources Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed equity investments, shares held 5,000,000 5,000,000  
Listed equity investments, group beneficial interest 2.80% 2.80%  
Listed associates | Rusoro Mining Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed associates, shares held 140,000,001 140,000,001  
Listed associates, group beneficial interest 25.70% 25.70%  
Listed associates | Lunnon Metals Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Listed associates, shares held 44,711,062 0  
Listed associates, group beneficial interest 31.70% 0.00%  
Joint ventures | Far Southeast Gold Resources Incorporated ("FSE")      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Joint ventures, shares held 1,737,699 1,737,699  
Interest in joint venture 40.00% 40.00%  
Joint ventures | Asanko Gold Ghana Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Joint ventures, shares held 450,000,000 450,000,000  
Interest in joint venture 45.00% 45.00%  
Joint ventures | Adansi Gold Company Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Joint ventures, shares held 100,000 100,000  
Interest in joint venture 50.00% 50.00%  
Joint ventures | Shika Group Finance Limited      
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items]      
Joint ventures, shares held 10,000 10,000  
Interest in joint venture 50.00% 50.00%