UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 7,153	$ 7,762
Short-term investments (Note 3)		400
Other investments, at fair value (Note 3)	263	293
Other current assets	656	952
Total current assets	8,072	9,407
Non-current assets:
Mineral properties (Note 4)	2,146	2,146
Plant and equipment, net (Note 5)	5,632	5,643
Right-of-use assets	29	34
Total non-current assets	7,807	7,823
Total assets	15,879	17,230
Current liabilities:
Accounts payable	176	356
Accrued liabilities and other	857	702
Deferred option gain (Note 4)	1,168	68
Total current liabilities	2,201	1,126
Non-current liabilities:
Provision for environmental liability (Note 7)	240	240
Other liabilities	25	13
Total non-current liabilities	265	253
Total liabilities	2,466	1,379
Commitments and contingencies (Note 8)
Shareholders' equity:
Common shares, no par value - unlimited shares authorized; shares outstanding:	461,162	460,501
Accumulated deficit	(447,749)	(444,650)
Total shareholders' equity	13,413	15,851
Total liabilities and shareholders' equity	$ 15,879	$ 17,230

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).

Name:	us-gaap_AccountsPayableCurrent
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 after twelve months or beyond the next operating cycle if longer.