UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 6,262	$ 7,762
Short-term investments (Note 3)		400
Other investments, at fair value (Note 3)	340	293
Other current assets	541	952
Total current assets	7,143	9,407
Non-current assets:
Mineral properties (Note 4)	2,146	2,146
Plant and equipment, net (Note 5)	5,678	5,643
Right-of-use assets	24	34
Total non-current assets	7,848	7,823
Total assets	14,991	17,230
Current liabilities:
Accounts payable	461	356
Accrued liabilities and other	963	702
Deferred option gain (Note 4)	248	68
Total current liabilities	1,672	1,126
Non-current liabilities:
Provision for environmental liability (Note 7)	240	240
Other liabilities	21	13
Total non-current liabilities	261	253
Total liabilities	1,933	1,379
Commitments and contingencies (Note 8)
Shareholders' equity:
Common shares, no par value - unlimited shares authorized; shares outstanding: 2021 - 104,909,837 and 2020 - 103,171,904 (Note 6)	461,560	460,501
Accumulated deficit	(448,502)	(444,650)
Total shareholders' equity	13,058	15,851
Total liabilities and shareholders' equity	$ 14,991	$ 17,230