CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Consolidated net loss	$ (7,900)	$ (11,116)
Adjustments to reconcile net loss to net cash used by operating activities:
Depreciation and amortization	134	1,870
Non-cash interest expense	89	62
Income realized on lease of water rights	(13)	(13)
Stock-based compensation for employees and directors	84	737
Decrease (increase) in deposits, prepaid expenses and other	(210)	52
Decrease in accounts payable and accrued liabilities	1,956	(508)
(Decrease) increase in post closure reclamation and remediation costs	76	(38)
Net cash used by operating activities	(5,784)	(8,954)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase and development of mining properties, land and water rights	(284)	(2,470)
Deposits on property, plant and equipment	152	(298)
Increase in investments for reclamation bonds	(308)
Net cash used by investing activities	(440)	(2,768)
CASH FLOWS FROM FINANCING ACTIVITIES:
Stock proceeds, net of issuance costs	4,962	2,365
Proceeds from unit offering	647
Net cash provided/(used) by financing activities:	5,609	2,365
Net (decrease) in cash, cash equivalents and restricted cash	(615)	(9,357)
Cash, cash equivalents and restricted cash, beginning of period	8,617	17,974
Cash, cash equivalents and restricted cash, end of period	8,002	8,617
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest, net of capitalized	(600)	(735)
NON-CASH INVESTING AND FINANCING ACTIVITIES:
Equity compensation capitalized as development	$ 8	134
Accrued portion of advance royalties		500
Change in accrued payments to Agricultural Sustainability Trust		1,550
Noncash change in deposits on property, plant and equipment		$ 153