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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Far Southeast Gold Resources Incorporated [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Group beneficial interest | 40.00% | 40.00% | 40.00%
Equity investments [member] | Asanko Gold Inc [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 22,354,657 | 0 |
Group beneficial interest | 9.90% | 0.00% |
Equity investments [member] | Bezant Resources PLC [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 17,945,922 | 17,945,922 |
Group beneficial interest | 1.80% | 2.90% |
Equity investments [member] | Cardinal Resources Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 42,818,182 | 42,818,182 |
Group beneficial interest | 11.30% | 11.50% |
Equity investments [member] | Cardinal Resources Limited Options [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 38,220,051 | 38,220,051 |
Group beneficial interest | 25.80% | 33.00% |
Equity investments [member] | Cascadero Copper Corporation [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 0 | 2,025,000 |
Group beneficial interest | 0.00% | 1.10% |
Equity investments [member] | Clancy Exploration Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 17,764,783 | 17,764,783 |
Group beneficial interest | 0.50% | 0.60% |
Equity investments [member] | Consolidated Woodjam Copper Corporation [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 16,115,740 | 12,848,016 |
Group beneficial interest | 19.90% | 17.20% |
Equity investments [member] | Fjordland Exploration Incorporated [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 0 | 363,636 |
Group beneficial interest | 0.00% | 0.80% |
Equity investments [member] | Gold Road Resources Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 87,117,909 | 87,117,909 |
Group beneficial interest | 9.90% | 9.90% |
Equity investments [member] | Hummingbird Resources Plc [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 21,258,503 | 21,258,503 |
Group beneficial interest | 6.00% | 6.20% |
Equity investments [member] | Lefroy Exploration Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 14,764,535 | 0 |
Group beneficial interest | 18.20% | 0.00% |
Equity investments [member] | Magmatic Resources Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 17,600,000 | 0 |
Group beneficial interest | 15.00% | 0.00% |
Equity investments [member] | Orsu Metals Corporation [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 2,613,491 | 2,613,491 |
Group beneficial interest | 7.20% | 7.30% |
Equity investments [member] | Radius Gold Incorporated [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 0 | 3,625,124 |
Group beneficial interest | 0.00% | 4.20% |
Equity investments [member] | Red 5 Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Asanko Gold Inc. | 246,875,821 | 246,875,821 |
Group beneficial interest | 19.90% | 19.90% |
Associates [member] | Maverix Metals Incorporated [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Maverix Metals Incorporated ("Maverix") | 42,850,000 | 42,850,000 |
Group beneficial interest | 19.90% | 27.90% |
Associates [member] | Rusoro Mining Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Maverix Metals Incorporated ("Maverix") | 140,000,001 | 140,000,001 |
Group beneficial interest | 25.70% | 25.70% |
Joint ventures [member] | Far Southeast Gold Resources Incorporated [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Adansi Gold Company Limited | 1,737,699 | 1,737,699 |
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] |  |  |
Adansi Gold Company Limited | 450,000,000 | 0 |
Group beneficial interest | 45.00% | 0.00% |
Joint ventures [member] | Adansi Gold Company Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Adansi Gold Company Limited | 100,000 | 0 |
Group beneficial interest | 50.00% | 0.00% |
Joint ventures [member] | Shika Group Finance Limited [member] |  |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [line items] |  |  |
Adansi Gold Company Limited | 10,000 | 0 |
Group beneficial interest | 50.00% | 0.00% |

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