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ACQUISITIONS (Details) - USD ($) $ / shares in Units, $ in Thousands | Jun. 11, 2018 | Aug. 25, 2017 | Apr. 26, 2017 | Feb. 13, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 19, 2017
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ACQUISITIONS |  |  |  |  |  |  |
Share price |  |  |  |  |  |  | $ 2.50
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Mineral property interests |  |  |  |  | $ 309,145 | $ 293,437 |
Other current assets |  |  |  |  | 2,707 | 4,539 |
Other non-current assets |  |  |  |  | 5,872 | 10,718 |
Accounts payable and accrued liabilities |  |  |  |  | (30,817) | (34,880) |
Asset retirement obligation |  |  |  |  | (734) | (646) |
Deferred tax liability |  |  |  |  | $ (6,426) | $ (8,430) |
Lexam VG Gold |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |
Common shares issued (in shares) |  |  | 12,687,035 |  |  |  |
Share price |  |  | $ 3.00 |  |  |  |
Share replacement awards |  |  | $ 100 |  |  |  |
Acquisition Purchase Price Stock Issued During Period Value |  |  | 38,141 |  |  |  |
Adjustments to purchase price |  |  | 1,017 |  |  |  |
Total fair value of assets acquired and liabilities assumed |  |  | 39,158 |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Mineral property interests |  |  | 41,595 |  |  |  |
Cash and cash equivalents |  |  | 177 |  |  |  |
Other current assets |  |  | 86 |  |  |  |
Other non-current assets |  |  | 312 |  |  |  |
Accounts payable and accrued liabilities |  |  | (288) |  |  |  |
Asset retirement obligation |  |  | (570) |  |  |  |
Deferred tax liability |  |  | (2,154) |  |  |  |
Total fair value of assets acquired and liabilities assumed |  |  | $ 39,158 |  |  |  |
Ratio of Company's share for acquired company's share |  |  |  | 0.056% |  |  |
Lexam VG Gold | Maximum |  |  |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Percentage of interest in the deposit |  |  | 20.00% |  |  |  |
Lexam VG Gold | Minimum |  |  |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Percentage of interest in the deposit |  |  | 10.00% |  |  |  |
Black Fox |  |  |  |  |  |  |
ACQUISITIONS |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  | $ 35,000 |  |  |  |  |
Common shares issued (in shares) | 178,321 |  |  |  |  |  |
Adjustments to purchase price |  | (7,500) |  |  |  |  |
Total fair value of assets acquired and liabilities assumed |  | 27,500 |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Mineral property interests |  | 8,954 |  |  |  |  |
Cash and cash equivalents |  | 249 |  |  |  |  |
Asset retirement obligation |  | (11,233) |  |  |  |  |
Deferred tax liability |  | (201) |  |  |  |  |
Total fair value of assets acquired and liabilities assumed |  | $ 27,500 |  |  |  |  |
Buffalo Ankerite, Fuller and Davidson Tisdale |  |  |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Percentage of interest in the deposit |  |  | 100.00% |  |  |  |
Paymaster | Lexam VG Gold |  |  |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Percentage of interest in the deposit |  |  | 61.00% |  |  |  |
Goldcorp Inc | Lexam VG Gold |  |  |  |  |  |  |
Fair value of assets acquired and liabilities assumed: |  |  |  |  |  |  |
Percentage of interest in the deposit |  |  | 39.00% |  |  |  |

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