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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Costs, expenses and other |  |
Exploration expense | $ 1,198 | $ 413
Depreciation and amortization | 27 | 25
Mineral property impairment | 17 | 6
General and administrative | 952 | 1,044
Total costs, expenses and other | 2,194 | 1,488
Other (expense) income |  |
Interest and dividend income (net) | 123 | 184
Other income | 10 | 104
Loss on derivative instruments | (38) | (92)
(Loss) gain on sale of marketable equity securities | (248) | 50
Unrealized loss on short-term investments | (102) | (57)
Unrealized gain on marketable equity securities | 82 | 360
Total other income (expense) | (173) | 549
Net loss | $ (2,367) | $ (939)
Loss per common share |  |
basic and diluted | $ (0.04) | $ (0.02)
Weighted average shares outstanding |  |
Basic and diluted | 58,709 | 58,116

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