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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities:    
Net loss $ (2,367,000) $ (939,000)
Adjustments to reconcile net loss to net cash used in operating activities:    
Unrealized gain on marketable equity securities (82,000) (360,000)
Unrealized loss on short-term investments 102,000 57,000
Loss (gain) on sale of marketable equity securities 248,000 (50,000)
Loss on derivative instruments 38,000 92,000
Other income - Paycheck Protection Program loan forgiveness (10,000) (60,000)
Other income - gain on conversion of SilverStream note 0 (44,000)
Mineral property impairment 17,000 6,000
Employee stock option expense 124,000 315,000
Depreciation 27,000 25,000
Amortization of right of use lease asset 40,000 38,000
Changes in operating assets and liabilities:    
Prepaid expenses and other current assets (277,000) 38,000
Accounts payable and other current liabilities 17,000 128,000
Net cash used in operating activities (2,157,000) (1,010,000)
Investing activities:    
Sale of short-term investments - net 609,000 974,000
Additions to mineral property (635,000)  
Sale of marketable equity securities 147,000 123,000
Sale (Purchase) of derivative instruments - net 8,000 (121,000)
Additions to other assets (39,000) 0
Net cash provided by investing activities 90,000 976,000
Financing activities:    
Issuance of common stock - net of acquisition costs 1,841,000  
Stock options exercised for cash 83,000  
Paycheck Protection Program loan 0 70,000
Repurchase of Solitario common stock for cancellation 0 (5,000)
Net cash provided in financing activities 1,924,000 65,000
Net (decrease) increase in cash and cash equivalents (143,000) 31,000
Cash and cash equivalents, beginning of year 605,000 574,000
Cash and cash equivalents, end of year 462,000 605,000
Supplemental Cash Flow information:    
Accrued mineral property acquisition costs included in accounts payable 60,000 0
Acquisition of right to use asset 99,000 0
Conversion of SilverStream note to Marketable equity securities 0 294,000
Acquisition of Gold Coin property included in accounts payable $ 0 $ 17,000