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ACQUISITIONS AND CHANGE IN INTEREST ON MINERAL PROPERTIES - Consideration Transferred and Net Identifiable Assets Acquired (Details) CAD / shares in Units, $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 31, 2016 CAD year shares CAD / shares | May 30, 2016 CAD | Mar. 07, 2016 CAD | Dec. 31, 2017 CAD year shares | Dec. 31, 2016 CAD year shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | May 31, 2016 USD ($) CAD / $ shares
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Share options assumed (in shares) | shares |  |  |  | 0 | 809,286 |  |  |
Goodwill |  |  |  |  |  | $ 49,786 | $ 49,786 |
Expected life (years) | year |  |  |  | 4.2 | 4.2 |  |  |
Average risk-free interest rate (%) |  |  |  | 1.00% | 0.63% |  |  |
Dividend yield (%) |  |  |  | 0.00% | 0.00% |  |  |
Volatility (%) |  |  |  | 60.90% | 59.50% |  |  |
Minimum |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Exercise price, share options granted | CAD |  |  |  | CAD 12.01 | CAD 7.17 |  |  |
Maximum |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Exercise price, share options granted | CAD |  |  |  | CAD 14.12 | CAD 7.27 |  |  |
Claude Resources Inc. |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Common shares issued |  |  |  |  |  |  |  | $ 325,202
Common shares issued (in shares) | shares |  |  |  |  |  |  |  | 37,394,000
Stock options assumed |  |  |  |  |  |  |  | $ 4,045
Share options assumed (in shares) | shares | 809,286 |  |  |  |  |  |  |
Share exchange cash payment of C$0.001 per Claude Resources share |  |  |  |  |  |  |  | 155
Cash transferred per common share (in CAD per share) | CAD / shares | CAD 0.001 |  |  |  |  |  |  |
Consideration |  |  |  |  |  |  |  | 329,402
Cash and cash equivalents |  |  |  |  |  |  |  | 16,908
Trade and other receivables |  |  |  |  |  |  |  | 814
Marketable securities |  |  |  |  |  |  |  | 351
Inventory |  |  |  |  |  |  |  | 34,801
Property, plant and equipment |  |  |  |  |  |  |  | 52,318
Goodwill |  |  |  |  |  |  |  | 49,786
Trade and other payables |  |  |  |  |  |  |  | (4,657)
Debt |  |  |  |  |  |  |  | (13,707)
Close-down and restoration provisions |  |  |  |  |  |  |  | (5,464)
Deferred income tax liabilities |  |  |  |  |  |  |  | (80,811)
Net identifiable assets acquired |  |  |  |  |  |  |  | $ 329,402
Transaction share price | CAD |  | CAD 11.35 | CAD 7.89 |  |  |  |  |
Closing foreign exchange rate (in CAD per USD) | CAD / $ |  |  |  |  |  |  |  | 0.7662
Expected life (years) | year | 1.6 |  |  |  |  |  |  |
Average risk-free interest rate (%) | 0.60% |  |  |  |  |  |  |
Dividend yield (%) | 0.00% |  |  |  |  |  |  |
Volatility (%) | 60.60% |  |  |  |  |  |  |
Claude Resources Inc. | Minimum |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Exercise price, share options granted | CAD | CAD 1.70 |  |  |  |  |  |  |
Claude Resources Inc. | Maximum |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Exercise price, share options granted | CAD | CAD 12.86 |  |  |  |  |  |  |
Claude Resources Inc. | Mineral properties subject to depreciation |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | $ 62,229
Claude Resources Inc. | Mineral properties not yet subject to depreciation |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | 128,100
Claude Resources Inc. | Exploration and evaluation assets |  |  |  |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  | $ 88,734

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