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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Operating Expenses: |  |  |  |
Mineral property expenses | $ (576) | $ (808) | $ (1,178) | $ (1,426)
Product development expenses | (175) | (16) | (301) | (32)
General and administrative expenses | (1,659) | (1,700) | (3,438) | (3,405)
Arbitration costs | (28) | (354) | (697) | (485)
Accretion of asset retirement obligations | (32) | (30) | (138) | (156)
Depreciation and amortization | (17) | (25) | (30) | (48)
Total operating expenses | (2,487) | (2,933) | (5,782) | (5,552)
Non-Operating Income/(Expenses): |  |  |  |
Loss on sale of marketable securities |  |  |  | (720)
Interest income |  | 168 |  | 334
Other income (expense) | 20 | (10) | 28 | (11)
Total other income (expense) | 20 | 158 | 28 | (397)
Net Loss | (2,467) | (2,775) | (5,754) | (5,949)
Other Comprehensive Income |  |  |  |
Transfer to realized loss upon sale of available for sale securities |  |  |  | 90
Comprehensive Loss | $ (2,467) | $ (2,775) | $ (5,754) | $ (5,859)
BASIC AND DILUTED LOSS PER SHARE | $ (0.43) | $ (1.81) | $ (1.18) | $ (3.95)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING | 5,786,117 | 1,532,802 | 4,895,533 | 1,505,668

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