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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, 2017 | Dec. 31, 2016
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Group beneficial interest | 50.00% |
Rusoro Mining Limited [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Group beneficial interest | 25.70% |
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%
Equity investments [member] | Bezant Resources PLC [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 17,945,922 | 17,945,922
Group beneficial interest | 2.90% | 8.80%
Equity investments [member] | Cardinal Resources Limited [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 42,818,182 | 13,700,270
Group beneficial interest | 11.50% | 4.50%
Equity investments [member] | Cardinal Resources Limited Options [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 38,220,051 | 19,705,790
Group beneficial interest | 33.00% | 17.00%
Equity investments [member] | Cascadero Copper Corporation [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 2,025,000 | 2,025,000
Group beneficial interest | 1.10% | 1.10%
Equity investments [member] | Clancy Exploration Limited [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 17,764,783 | 17,764,783
Group beneficial interest | 0.60% | 0.70%
Equity investments [member] | Consolidated Woodjam Copper Corporation [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 12,848,016 | 12,848,016
Group beneficial interest | 17.20% | 17.80%
Equity investments [member] | Fjordland Exploration Incorporated [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 363,636 | 1,818,182
Group beneficial interest | 0.80% | 1.80%
Equity investments [member] | Gold Road Resources Limited [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 87,117,909 | 0
Group beneficial interest | 9.90% | 0.00%
Equity investments [member] | Hummingbird Resources Plc [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 21,258,503 | 21,258,503
Group beneficial interest | 6.20% | 6.20%
Equity investments [member] | Orsu Metals Corporation [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 2,613,491 | 26,134,919
Group beneficial interest | 7.30% | 19.70%
Equity investments [member] | Radius Gold Incorporated [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 3,625,124 | 3,625,124
Group beneficial interest | 4.20% | 4.20%
Equity investments [member] | Red 5 Limited [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 246,875,821 | 0
Group beneficial interest | 19.90% | 0.00%
Associates [member] | Maverix Metals Incorporated [member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 42,850,000 | 42,850,000
Group beneficial interest | 27.90% | 32.30%
Associates [member] | Rusoro Mining Limited [Member] |  |
Disclosure of Investments in Associates Joint Venture and Other Equity Investments [Line Items] |  |
Shares held | 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] |  |
Shares held | 1,737,699 | 1,737,699
Group beneficial interest | 40.00% | 40.00%

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