Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended		12 Months Ended				172 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss for the period	$ (15,430)	$ (21,061)	$ (22,246)	$ (29,362)	$ (34,994)	$ (16,657)	$ (99,441)
Adjustments to reconcile loss for the period to net cash and cash equivalents used in operations:
Depreciation	90	42	197	170	123	38	459
Asset retirement obligation	(46)		26	288	334	101	415
Fair value of warrants received pursuant to the sale of mineral properties							(15)
Realized gain on derivatives			(150)				(150)
Unrealized loss on derivatives	4	(173)	69	142	(35)	2,345	1,021
Write-down of mineral property		931		943	1,874		1,891
(Gain)/Loss on currency translation	16	12		(29)	(33)		(17)
Loss on disposal of marketable securities	7	9	39	10	11		57
Loss on disposal of equipment	(3)			(3)			(3)
Stock-based compensation	1,643	6,041	1,378	6,358	10,757	7,414	22,927
Changes in working capital
Accounts receivable	6	(22)	(12)	(155)	(183)	(34)	(170)
Interest receivable	(128)	(200)	299	188	109	(276)	(12)
Prepaid expenses	55	(1)	(217)	169	113	(282)	(414)
Accounts payable and accrued liabilities	1,389	1,777	(1,839)	641	1,036	609	1,386
Due to related party		(45)		(29)	(74)	62	(28)
Net cash and cash equivalents used in operating activities	(12,397)	(12,690)	(22,456)	(20,668)	(20,961)	(6,680)	(72,094)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of marketable securities						(207)	(207)
Purchases of short-term investments	(485)		(9,823)	(15,118)	(14,633)		(24,941)
Additions to mineral properties, net of cost recoveries						(2)	(29)
Additions to restricted cash						(312)	(422)
Release of restricted cash	422			422			422
Purchases of equipment	(11)	(270)	(201)	(316)	(575)	(143)	(981)
Purchases of land			(980)				(980)
Proceeds from sale of marketable securities	36	70	36	80	114		186
Proceeds from sale of short-term investments			24,941				24,941
Payments received for sale/option of mineral properties							279
Net cash and cash equivalents provided by (used in) investing activities	(38)	(200)	13,973	(14,932)	(15,094)	(664)	(1,732)
CASH FLOWS FROM FINANCING ACTIVITIES:
Advance of promissory note							111
Repayment of promissory note							(129)
Cash received for common shares, net of share issuance costs	390	55	7,400	1,108	773	68,196	97,528
Net cash and cash equivalents provided by financing activities	390	55	7,400	1,108	773	68,196	97,510
Cash acquired in capital transaction							219
Increase/(decrease) in cash and cash equivalents	(12,045)	(12,835)	(1,083)	(34,492)	(35,282)	60,852	23,902
Cash and cash equivalents - beginning of the period	37,030	72,312	24,985	59,477	72,312	11,460
Cash and cash equivalents - end of the period	$ 24,985	$ 59,477	$ 23,902	$ 24,985	$ 37,030	$ 72,312	$ 23,902