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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
FSE [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Joint ventures, Group beneficial interest | 40.00% | 40.00% | 40.00%
Equity investments [member] | Galiano Gold Inc. (formerly Asanko Gold Inc.) [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Listed equity investments, Shares held | 21,971,657 | 22,354,657 |
Listed equity investments, Group beneficial interest | 9.80% | 9.90% |
Equity investments [member] | Bezant Resources PLC [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Listed equity investments, Shares held | 17,945,922 | 17,945,922 |
Listed equity investments, Group beneficial interest | 0.60% | 1.80% |
Equity investments [member] | Cardinal Resources Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Listed equity investments, Shares held |  | 81,038,233 |
Listed equity investments, Group beneficial interest |  | 16.40% |
Equity investments [member] | Clancy Exploration Limited [member] |  |  |
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% |
Equity investments [member] | Consolidated Woodjam Copper Corporation [member] |  |  |
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 | 16.30% | 19.90% |
Equity investments [member] | Lefroy Exploration Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Listed equity investments, Shares held | 21,613,910 | 18,214,535 |
Listed equity investments, Group beneficial interest | 18.00% | 18.40% |
Equity investments [member] | Magmatic Resources Limited [member] |  |  |
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 | 10.90% | 12.50% |
Equity investments [member] | Orsu Metals Corporation [member] |  |  |
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 | 6.10% | 6.20% |
Equity investments [member] | Chakana Copper Corp3 [ member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Listed equity investments, Shares held | 15,686,275 | 15,686,275 |
Listed equity investments, Group beneficial interest | 16.80% | 16.80% |
Equity investments [member] | Amarc Resources Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Listed equity investments, Shares held | 5,000,000 |  |
Listed equity investments, Group beneficial interest | 2.80% |  |
Associates [member] | Rusoro Mining Limited [member] |  |  |
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% |
Joint ventures [member] | FSE [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Joint ventures, Shares held | 1,737,699 | 1,737,699 |
Joint ventures, Group beneficial interest | 40.00% | 40.00% |
Joint ventures [member] | Asanko Gold Ghana Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Joint ventures, Shares held | 450,000,000 | 450,000,000 |
Joint ventures, Group beneficial interest | 45.00% | 45.00% |
Joint ventures [member] | Adansi Gold Company Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Joint ventures, Shares held | 100,000 | 100,000 |
Joint ventures, Group beneficial interest | 50.00% | 50.00% |
Joint ventures [member] | Shika Group Finance Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Joint ventures, Shares held | 10,000 | 10,000 |
Joint ventures, Group beneficial interest | 50.00% | 50.00% |

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