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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) |  |
Revenues | $ 0 | $ 0
Operating expense: |  |
Exploration, property evaluation and holding costs | $ (4,803) | $ (6,931)
Type of Cost, Good or Service [Extensible List] | us-gaap:MineralExplorationMember | us-gaap:MineralExplorationMember
Corporate administration | $ (4,072) | $ (3,527)
Depreciation and amortization | (983) | (655)
Write-down of plant and equipment (Note 5) | (1,000) |
Gain on disposal of mineral properties, net (Note 4) |  | 358
Total operating expense | (10,858) | (10,755)
Non-operating income/(expense): |  |
(Loss)/gain on other investments (Note 3) | 1,716 | (1,248)
Interest income | 368 | 111
Other income/(expense) | 60 | (143)
Total non-operating income/(expense) | 2,144 | (1,280)
Loss before income taxes | (8,714) | (12,035)
Net loss | (8,714) | (12,035)
Other comprehensive loss: |  |
Unrealized fair value increase/ (decrease) on available-for-sale securities |  | (17)
Comprehensive loss | $ (8,714) | $ (12,052)
Basic: |  |
Weighted average number of shares outstanding (in shares) | 99,738,461 | 98,627,255
Net loss per share, Basic (in dollars per share) | $ (0.09) | $ (0.12)
Diluted: |  |
Weighted average number of shares outstanding (in shares) | 99,738,461 | 98,627,255
Net loss per share, Diluted (in dollars per share) | $ (0.09) | $ (0.12)

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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration