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Exploration and Evaluation Assets - Disclosure Of Exploration And Evaluation Assets Comprised Of Acquisition Costs (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Exploration and evaluation assets are comprised of acquisition costs [Line Items] |  |
Exploration And Evaluation Assets | $ 13,750 | $ 171,709
Castle Mountain [Member] |  |
Exploration and evaluation assets are comprised of acquisition costs [Line Items] |  |
Exploration And Evaluation Assets |  | 133,060
Aurizona [Member] |  |
Exploration and evaluation assets are comprised of acquisition costs [Line Items] |  |
Exploration And Evaluation Assets | $ 13,750 | 13,750
Elk Gold [member] |  |
Exploration and evaluation assets are comprised of acquisition costs [Line Items] |  |
Exploration And Evaluation Assets |  | 5,000
Solaris [Member] |  |
Exploration and evaluation assets are comprised of acquisition costs [Line Items] |  |
Exploration And Evaluation Assets |  | $ 19,899

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- Definition The amount of exploration and evaluation assets recognised as tangible assets in accordance with the entity's accounting policy. [Refer: Exploration and evaluation assets [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 6 -IssueDate 2019-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=6&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard -URIDate 2019-03-27 + Details
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