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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Cash flows from operating activities: |  |  |  |
Net loss |  |  | $ (3,852) | $ (1,598)
Adjustments to reconcile net income/(loss) to net cash used in operations: |  |  |  |
Depreciation and amortization | $ 12 | $ 11 | 23 | 23
Stock-based compensation |  |  | 584 | 592
Gain on disposal of mineral property | (2,100) | (2,568) | (2,100) | (2,568)
(Gain)/Loss on other investments | (77) | (1,099) | (47) | 30
Change in working capital account items: |  |  |  |
Other current assets |  |  | 220 | 167
Accounts payable, accrued liabilities and other |  |  | 384 | 88
Net cash used in operating activities |  |  | (4,788) | (3,266)
Cash flows from investing activities: |  |  |  |
Proceeds from sales of marketable securities |  |  |  | 954
Disposition of short-term investments, net |  |  | 400 | (34)
Additions to plant and equipment |  |  | (58) |
Proceeds from option/sale agreements, net |  |  | 2,280 | 2,400
Net cash provided by investing activities |  |  | 2,622 | 3,320
Cash flows from financing activities: |  |  |  |
Proceeds from equity financing, net |  |  | 1,062 | 807
Payment of taxes from withheld shares |  |  | (396) | (97)
Proceeds from exercise of stock options |  |  |  | 37
Net cash provided by financing activities |  |  | 666 | 747
Net increase/(decrease) in cash and cash equivalents |  |  | (1,500) | 801
Cash and cash equivalents, beginning of period |  |  | 7,762 | 1,408
Cash and cash equivalents, end of period | $ 6,262 | $ 2,209 | $ 6,262 | $ 2,209

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