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CONSOLIDATED STATEMENTS OF INCOME/(LOSS) AND COMPREHENSIVE INCOME/(LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Operating expense: |  |
Exploration, property evaluation and holding costs | $ (4,093) | $ (4,803)
Corporate administration | (3,940) | (4,072)
Depreciation and amortization | (52) | (983)
Write-down of plant and equipment (Note 5) |  | (1,000)
Total operating expense | (8,085) | (10,858)
Non-operating income/(expense): |  |
Gain/(loss) on other investments (Note 3) | (1,643) | 1,716
Interest income | 121 | 368
Other income/(expense) | 221 | 60
Total non-operating income/(expense) | (1,301) | 2,144
Loss before income taxes | (9,386) | (8,714)
Net loss | (9,386) | (8,714)
Other comprehensive loss: |  |
Comprehensive loss | $ (9,386) | $ (8,714)
Basic: |  |
Weighted average number of shares outstanding (in shares) | 100,533,448 | 99,738,461
Net loss per share, Basic (in dollars per share) | $ (0.09) | $ (0.09)
Diluted: |  |
Weighted average number of shares outstanding (in shares) | 100,533,448 | 99,738,461
Net loss per share, Diluted (in dollars per share) | $ (0.09) | $ (0.09)

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