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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Current assets: |  |
Cash and equivalents | $ 1,360 | $ 3,354
Marketable equity securities | 1,178 | 251
Oil and gas sales receivable | 834 | 1,143
Assets held for sale | 653 |
Prepaid expenses and other | 319 | 136
Oil price risk derivatives | 174 | 1,634
Discontinued operations - assets of mining segment | 135 | 318
Total current assets | 4,653 | 6,836
Oil and gas properties under full cost method: |  |
Unevaluated properties | 4,665 | 5,664
Evaluated properties | 89,402 | 97,912
Less accumulated depreciation, depletion and amortization | (81,774) | (80,144)
Net oil and gas properties | 12,293 | 23,432
Other assets: |  |
Property and equipment, net | 1,934 | 2,658
Other assets | 158 | 206
Total other assets | 2,092 | 2,864
Total assets | 19,038 | 33,132
Accounts payable and accrued liabilities: |  |
Payable to major operator | 3,302 | 4,159
Contingent ownership interests | 3,593 | 3,108
Trade payables and accrued expenses | 1,216 | 1,791
Accrued compensation and benefits | 51 | 1,352
Current portion of long-term debt | 6,000 | 6,000
Discontinued operations of mining properties |  | 204
Total current liabilities | 14,162 | 16,614
Noncurrent liabilities: |  |
Asset retirement obligations | 1,054 | 1,038
Other accrued liabilities | 173 | 5
Total noncurrent liabilities | 1,227 | 1,043
Commitments and contingencies (Note 9) |  |
Shareholders' equity: |  |
Preferred stock, par value $0.01 per share. Authorized 100,000 shares, issued and outstanding 50,000 shares of Series A Convertible Preferred Stock in 2016; liquidation preference of $2,034 as of June 30, 2016 | 1 |
Common stock, $0.01 par value; unlimited shares authorized; issued and outstanding 4,704,267 shares in 2016 and 4,699,956 shares in 2015 | 47 | 47
Additional paid-in capital | 127,197 | 125,133
Accumulated deficit | (124,523) | (109,705)
Other comprehensive income | 927 |
Total shareholders' equity | 3,649 | 15,475
Total liabilities and shareholders' equity | $ 19,038 | $ 33,132

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