UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 2,209	$ 1,408
Short-term investments (Note 3)	3,294	3,260
Other investments, at fair value (Note 3)	2,692	3,676
Other current assets	315	482
Total current assets	8,510	8,826
Non-current assets:
Mineral properties (Note 4)	2,146	2,146
Plant and equipment, net (Note 5)	5,600	5,623
Right-of-use assets	40	89
Total non-current assets	7,786	7,858
Total assets	16,296	16,684
Current liabilities:
Accounts payable	54	190
Accrued liabilities and other	650	640
Deferred option gain (Note 4)	2,960
Provision for environmental liability (Note 7)		240
Total current liabilities	3,664	1,070
Non-current liabilities:
Deferred option gain (Note 4)		2,960
Provision for environmental liability (Note 7)	240
Lease liability	5	8
Total non-current liabilities	245	2,968
Total liabilities	3,909	4,038
Commitments and contingencies - (Note 8)
Shareholders' equity:
Common shares, no par value - unlimited shares authorized; shares outstanding: 2020 - 102,096,256 and 2019 - 100,698,124 (Note 6)	459,055	457,716
Accumulated deficit	(446,668)	(445,070)
Total shareholders' equity	12,387	12,646
Total liabilities and shareholders' equity	$ 16,296	$ 16,684