CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,163	$ 1,431
Short-term investments (Note 3)	9,029	15,144
Other investments, at fair value (Note 3)	5,500	3,746
Other current assets	227	794
Total current assets	15,919	21,115
Non-current assets:
Mineral properties (Note 4)	2,471	2,471
Plant and equipment, net (Note 5)	7,389	7,555
Total non-current assets	9,860	10,026
Total assets	25,779	31,141
Current liabilities:
Accounts payable	217	830
Accrued liabilities and other	493	986
Provision for environmental liability	242	242
Total current liabilities	952	2,058
Total liabilities	952	2,058
Commitments and contingencies – (Note 7)
Shareholders' equity:
Common shares, no par value - unlimited shares authorized; shares outstanding: 2018 - 100,089,561 and 2017 - 99,412,007 (Note 6)	456,730	456,053
Accumulated other comprehensive loss		(2)
Accumulated deficit	(431,903)	(426,968)
Total shareholders' equity	24,827	29,083
Total liabilities and shareholders' equity	$ 25,779	$ 31,141

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer.