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Mineral Properties, Plant and Equipment - Detailed Information About In Property Plant And Equipment (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of property plant and equipment [line items] |  |
Beginning balance | $ 316,911 |
Ending balance | 497,944 | $ 316,911
Gross carrying amount [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 320,700 | 164,882
Acquisition of Mesquite |  | 43,194
Additions | 89,973 | 125,755
Impairment |  | (4,667)
Transfers | (9,937) |
Transfer from exploration and evaluation assets | 133,060 |
Disposals | (1,832) | (9,929)
Change in ARO asset | 6,080 | 1,465
Ending balance | 538,044 | 320,700
Accumulated impairment [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 3,789 | 1,210
Additions | 37,112 | 4,548
Disposals | (801) | (1,969)
Ending balance | 40,100 | 3,789
Mineral Properties [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 74,066 |
Ending balance | 272,766 | 74,066
Mineral Properties [member] | Gross carrying amount [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 74,392 | 72,592
Acquisition of Mesquite |  | 27
Additions | 16,924 | 308
Transfers | 55,318 |
Transfer from exploration and evaluation assets | 133,060 |
Change in ARO asset | 6,080 | 1,465
Ending balance | 285,774 | 74,392
Mineral Properties [member] | Accumulated impairment [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 326 |
Additions | 12,682 | 326
Ending balance | 13,008 | 326
Property, plant and equipment [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 76,244 |
Ending balance | 178,169 | 76,244
Property, plant and equipment [member] | Gross carrying amount [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 79,607 | 47,873
Acquisition of Mesquite |  | 43,167
Additions | (6,641) | 2,285
Impairment |  | (4,448)
Transfers | 133,694 |
Disposals | (1,758) | (9,270)
Ending balance | 204,902 | 79,607
Property, plant and equipment [member] | Accumulated impairment [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 3,363 | 1,167
Additions | 24,136 | 4,135
Disposals | (766) | (1,939)
Ending balance | 26,733 | 3,363
Pre Development Assets [member] | Gross carrying amount [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance |  | 44,194
Transfers |  | (44,194)
Construction in progress [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 166,542 |
Transfers | 195,300 |
Ending balance | 45,252 | 166,542
Construction in progress [member] | Gross carrying amount [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 166,542 |
Additions | 78,748 | 123,124
Impairment |  | (206)
Transfers | (200,038) | 44,194
Disposals |  | (570)
Ending balance | 45,252 | 166,542
Computer And Office Equipment [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 59 |
Ending balance | 1,757 | 59
Computer And Office Equipment [member] | Gross carrying amount [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 159 | 223
Additions | 942 | 38
Impairment |  | (13)
Transfers | 1,089 |
Disposals | (74) | (89)
Ending balance | 2,116 | 159
Computer And Office Equipment [member] | Accumulated impairment [member] |  |
Disclosure of property plant and equipment [line items] |  |
Beginning balance | 100 | 43
Additions | 294 | 87
Disposals | (35) | (30)
Ending balance | $ 359 | $ 100

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