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v3.20.1

Acquisitions and Divestitures - Additional Information (Detail) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |
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Dec. 30, 2019 | Nov. 18, 2019 USD ($) shares | Jun. 30, 2019 USD ($) | Jun. 20, 2019 USD ($) $ / shares shares | Jun. 20, 2019 CAD ($) | May 16, 2019 USD ($) | May 16, 2019 CAD ($) | Mar. 19, 2019 USD ($) $ / shares shares | Mar. 19, 2019 CAD ($) | Aug. 21, 2018 USD ($) $ / shares shares | Aug. 03, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) Mineral Hectares | Dec. 31, 2018 USD ($) | Nov. 18, 2019 CAD ($) shares | Sep. 30, 2019 USD ($) | May 16, 2019 CAD ($) | Jan. 28, 2019 | Oct. 30, 2018 USD ($) | Aug. 21, 2018 CAD ($) shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition financing package |  |  |  |  |  |  |  |  |  |  |  |  | $ 670,000 |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,283 |  |  |  |  |  |
Proceeds from equity interest sold |  |  |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment received |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Non cash payments received |  |  |  |  |  |  | $ 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Note payable in annual instalments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,000,000 |  |  |
Inca One [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued or issuable on purchase of joint venture | shares |  |  |  |  |  |  |  |  |  | 51,300,000 |  |  |  |  |  |  |  |  |  | 51,300,000
Percentage of interest issued or issuable |  |  |  |  |  |  |  |  |  | 19.99% |  |  |  |  |  |  |  |  |  | 19.99%
Value of shares issued or issuable |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Promissory note payable |  |  |  |  |  |  |  |  |  | 6,800 |  |  |  |  |  |  |  |  |  |
Value of cash or shares payable in one installment |  |  |  |  |  |  |  |  |  | 1,900 |  |  |  |  |  |  |  |  |  |
Value of cash payable in installment |  |  |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |  |  |  |  |
Payment of recoverable taxes |  |  |  |  |  |  |  |  |  | 2,200 |  |  |  |  |  |  |  |  |  |
Working capital adjustment payment payable |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |  |  |  |  |  |  |
Koricancha [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,135 |  |  |  |  |  |
Percentage of gold stream obligation |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |
Gain on loss of control |  |  |  |  |  |  |  |  |  |  |  |  |  | (545) |  |  |  |  |  |
Gross consideration for sale of portion in joint venture |  |  |  |  |  |  |  |  |  | $ 12,100 |  |  |  |  |  |  |  |  |  | $ 15,900,000
Private Placement Member [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dilution loss |  |  |  |  |  |  |  |  |  |  |  |  | 500 |  |  |  |  |  |  |
At Market [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition financing package |  |  |  |  |  |  |  |  |  |  |  |  | 40,000 |  |  |  |  |  |  |
New Convertible Debenture [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition financing package |  |  |  |  |  |  |  |  |  |  |  |  | 130,000 |  |  |  |  |  |  |
Corporate Revolving Credit Facility [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition financing package |  |  |  |  |  |  |  |  |  |  |  |  | 400,000 |  |  |  |  |  |  |
Term Loan [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition financing package |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |
Elk Gold [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contiguous mineral claims number | Mineral |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  |  |  |
Hectares in one mining Lease | Hectares |  |  |  |  |  |  |  |  |  |  |  |  | 16,566 |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  | $ 9,900 |  |  |  |  |  |  |
Percentage of equity interest sold |  |  |  |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from equity interest sold |  |  |  |  |  | $ 7,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash payment received |  |  |  |  |  | 700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non cash payments received |  |  |  |  |  | 6,700 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Note payable in annual instalments |  |  |  |  |  | $ 2,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity investment payment terms |  |  |  |  |  | The total amount due under the promissory note may be adjusted such that if the buyer pays an additional C$7 million within two years from closing, that will represent full and final payment; or if the buyer pays an additional C$8.5 million within three years from closing, that will represent full and final payment. | The total amount due under the promissory note may be adjusted such that if the buyer pays an additional C$7 million within two years from closing, that will represent full and final payment; or if the buyer pays an additional C$8.5 million within three years from closing, that will represent full and final payment. |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration receivable |  |  |  |  |  | $ 5,200 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future cash flow discount rate |  |  |  |  |  | 15.00% |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |
Gain on loss of control |  |  |  |  |  | $ 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elk Gold [member] | Other Receivables [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of consideration receivable |  |  |  |  |  | $ 4,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solaris Resources Inc [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest by entity |  |  |  |  |  |  |  |  |  |  | 60.00% |  | 30.00% |  |  |  |  |  |  |
Adjustments to non controlling interest |  |  |  |  |  |  |  |  |  |  | $ 7,400 |  |  |  |  |  |  |  |  |
Ownership Percentage In Subsidiary Due to Dilution of Interest |  |  | 32.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of composition of capital units |  | Each unit is comprised of one common share and one-half of a share purchase warrant. Each full warrant entitles the Company to purchase one common share of Solaris at a price of C$0.60 over a three-year period. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain Loss On Related Party Receivables |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Solaris Resources Inc [member] | Equinox Golds Shareholders [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest by entity |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |  |  |  |  |
Solaris Resources Inc [member] | Equinox Gold [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest by entity | 30.00% |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |  |  |  |  |
Gain on loss of control |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 |  |  |  |  |  |  |
Subscription of units for receivables | shares |  | 6.9 |  |  |  |  |  |  |  |  |  |  |  |  | 6.9 |  |  |  |  |
Cancellation of receivables from subsidiaries |  | $ 2,100 |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.8 |  |  |  |  |
Percentage of pro-rata interest |  | 32.00% |  |  |  |  |  |  |  |  |  |  |  |  | 32.00% |  |  |  |  |
Dilution gain |  |  |  |  |  |  |  |  |  |  |  |  | $ 600 |  |  |  |  |  |  |
Solaris Resources Inc [member] | Private Placement Member [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares Issued | shares |  |  |  | 2,500,000 |  |  |  | 15,700,000 |  |  |  |  |  |  |  |  |  |  |  |
Price per share | $ / shares |  |  |  | $ 0.25 |  |  |  | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issuance |  |  |  | $ 500 | $ 600,000 |  |  | $ 3,000 | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |
Solaris Resources Inc [member] | Other Receivables [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on loss of control |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stream holder [member] | Koricancha [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  |  |  |  |  |  | 24,100 |  |  |  |  |  |
Future cash flow discount rate |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |  | 10.00%
Percentage of gold stream obligation |  |  |  |  |  |  |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |
Number of shares issued or issuable on purchase of joint venture | shares |  |  |  |  |  |  |  |  |  | 51,300,000 |  |  |  |  |  |  |  |  |  | 51,300,000
Value of shares issued or issuable |  |  |  |  |  |  |  |  |  | $ 2,000 |  |  |  |  |  |  |  |  |  |
Value of cash payable in installment |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |  |
Percentage of interest issued or issuable in settlement |  |  |  |  |  |  |  |  |  | 19.99% |  |  |  |  |  |  |  |  |  | 19.99%
Sale related cost payable |  |  |  |  |  |  |  |  |  | $ 1,900 |  |  |  |  |  |  |  |  |  |
Settlement value per common stock | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.068 |  |  |  |  |  |  |  |  |  |
Percentage of interest on exercise of option |  |  |  |  |  |  |  |  |  | 19.99% |  |  |  |  |  |  |  |  |  | 19.99%
Fair value of the net consideration |  |  |  |  |  |  |  |  |  | $ 7,700 |  |  |  |  |  |  |  |  |  |
Leagold Mining Corporation [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interest acquired |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Business combination shares issued |  |  |  |  |  |  |  |  |  |  |  |  | 0.331 |  |  |  |  | 0.331 |  |
Acquisition related costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,300 |  |  |  |  |  |  |
Mesquite acquisition [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in Inventory |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 48,100 |  |  |  |
Reduction Value of Attributed Property and Plant Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 52,500 |  |  |  |
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 158,000 |
Working capital adjustments payable |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,100 |  |  |  |  |  |
Bargain purchase gain recognized in net loss at October 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,600 |  |  |  |  |  |  |
Adjustments to operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,100 |  |  |  |  |  |
Consolidated revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,200 |  |  |  |  |  |
Pre-tax net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,800 |  |  |  |  |  |
Pro-forma unaudited consolidated revenue |  |  |  |  |  |  |  |  |  |  |  |  |  | 176,000 |  |  |  |  |  |
Pre-tax net loss from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000 |  |  |  |  |  |
Increase in Consideration |  |  |  |  |  |  |  |  |  |  |  | $ 3,400 |  |  |  |  |  |  |  |

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