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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Operating activities: |  |
Net loss | $ (3,928) | $ (2,367)
Adjustments to reconcile net loss to net cash used in operating activities: |  |
Unrealized loss (gain) on marketable equity securities | 94 | (82)
Unrealized loss on short-term investments | 108 | 102
Loss on sale of marketable equity securities | (201) | 248
Loss on derivative instruments | 4 | 38
Other income - Paycheck Protection Program loan forgiveness | 0 | (10)
Mineral property impairment | 0 | 17
Employee stock option expense | 338 | 124
Depreciation | 29 | 27
Amortization of right of use lease asset | 40 | 40
Changes in operating assets and liabilities: |  |
Prepaid expenses and other current assets | 265 | (277)
Accounts payable and other current liabilities | (51) | (17)
Net cash used in operating activities | (2,900) | (2,157)
Investing activities: |  |
Sale of short-term investments - net | 1,028 | 609
Additions to mineral property | (340) | (635)
Sale of marketable equity securities | 63 | 147
Sale of derivative instruments - net | 0 | 8
Additions to other assets | (50) | (39)
Net cash provided by investing activities | 701 | 90
Financing activities: |  |
Issuance of common stock - net of issuance costs | 2,023 | 1,841
Stock options exercised for cash | 30 | 83
Net cash provided by financing activities | 2,053 | 1,924
Net decrease in cash and cash equivalents | (146) | (143)
Cash and cash equivalents, beginning of year | 462 | 605
Cash and cash equivalents, end of year | 316 | 462
Supplemental Cash Flow information: |  |
Accrued mineral property acquisition costs included in accounts payable | 0 | 60
Acquisition of right to use asset | $ 0 | $ 99

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