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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) [Abstract] |  |  |
Revenues | $ 0 | $ 0 | $ 0
Operating expense: |  |  |
Exploration, property evaluation and holding costs | (4,303) | (4,265) | (3,991)
Corporate administration | (2,944) | (3,888) | (3,798)
Depreciation and amortization | (618) | (694) | (863)
Gain on disposal of mineral property, net (Note 4) | 150 | 1,958 |
Write-down of mineral property (Note 4) |  |  | (750)
Write-down of Amayapampa interest (Note 9) |  |  | (4,813)
Write-down of value-added tax receivable |  | (572) |
Total operating expense | (7,715) | (7,461) | (14,215)
Non-operating income/(expenses): |  |  |
Gain on sale of marketable securities |  | 12 | 24
Gain/(loss) on other investments (Note 3) | 3,196 | (1,593) | (4,112)
Write-down of marketable securities and long-term investments |  |  | (138)
Research and development grant, net (Note 10) | 1,295 | 10,220 |
Interest income | 57 | 31 | 10
Interest expense |  |  | (78)
Other income/(expense) | 34 | (198) | (417)
Total non-operating income/(expense) | 4,582 | 8,472 | (4,711)
Net income/(loss) | (3,133) | 1,011 | (18,926)
Other comprehensive income (loss): |  |  |
Unrealized fair value increase/(decrease) on available-for-sale securities | 50 | (46) | 70
Comprehensive income/(loss) | $ (3,083) | $ 965 | $ (18,856)
Basic: |  |  |
Weighted average number of basic shares outstanding (in shares) | 89,064,260 | 82,571,182 | 82,294,331
Net income/(loss) per share, Basic | $ (0.04) | $ 0.01 | $ (0.23)
Diluted: |  |  |
Weighted average number of diluted shares outstanding (in shares) | 89,064,260 | 83,755,080 | 82,294,331
Net income/(loss) per share, Diluted | $ (0.04) | $ 0.01 | $ (0.23)

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