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Mineral Properties (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Capitalized Investment in Mineral Properties |
(in thousands) | December 31,
| 2017 | 2016
Exploration |  |
Lik project (Alaska – US) | $15,611 | $ -
La Promesa (Peru) | 6 | 6
Montana Royalty property (US) | 40 | 40
Total exploration mineral property | $15,657 | $46
Exploration Expense |
| For the year ended December 31,
(in thousands) | 2017 | 2016
Geologic and field expenses | $447 | $537
Administrative | 252 | 91
Total exploration expense | $699 | $628

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