Consolidated Balance Sheets (Unaudited) (Under Creditor Protection Proceedings as of November 29, 2011 - note 1) (USD $) In Thousands, unless otherwise specified	Jan. 31, 2012	Apr. 30, 2011
Current Assets:
Cash and cash equivalents	$ 1,789	$ 15,984
Restricted cash (note 4)	2,279	1,862
Accounts receivable	1,364	921
Prepaid expenses	439	630
Total Current Assets	5,871	19,397
Property and Equipment (notes 5 and 6)	145,546	153,795
Total Assets	151,417	173,192
Current Liabilities:
Accounts payable	370	561
Accrued liabilities	1,659	5,696
Current portion of asset retirement obligation (note 8)	479	7,297
Total Current Liabilities	2,508	13,554
Obligation under sublease contract	1,064	550
Asset Retirement Obligation (note 8)	4,455	19,585
Liabilities subject to compromise (note 7)	25,775	0
Capital Stock
Preferred Stock, par value of $0.001 each, 10,000,000 shares authorized, 1 Series B Preferred share outstanding (notes 10 and 11)	0	0
Common Stock, par value of $0.001 each, 750,000,000 shares authorized, 348,698,837 and 348,495,556 shares outstanding at January 31, 2012 and April 30, 2011 respectively (note 11)	348	348
Additional Paid-in Capital	789,866	789,738
Deficit Accumulated During Development Stage	(725,975)	(711,435)
Accumulated Other Comprehensive Income	53,376	60,852
Total Stockholders' Equity	117,615	139,503
Total Liabilities and Stockholders' Equity	151,417	173,192
Companies' Creditor Arrangement Act (Canada) proceedings and going concern (note 1)
Contingencies and commitments (note 14)
Subsequent events (notes 1, 5, 6, 14 and 15)