Organization and business (Detail) (USD $)	6 Months Ended	12 Months Ended
	Apr. 24, 2012 Century Concession in Laos [Member] Century Thrust Joint Venture Agreement [Member]	Oct. 31, 2012 Century Concession in Laos [Member] Century Thrust Joint Venture Agreement [Member]	Dec. 31, 2010 Century Concession in Laos [Member] Century Thrust Joint Venture Agreement [Member]	Oct. 31, 2012 Golden Target Pty Ltd, Principal Stockholder [Member]	Jul. 31, 2009 Golden Target Pty Ltd, Principal Stockholder [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Percentage of entity owned				96.21%
Percentage of the entity acquired from certain stockholders					96.00%
Aggregate percentage owned by unrelated entity			70.00%
Potential percentage of investee earnings attributable to Aurum if specified funding is provided by Aurum		72.86%
Potential ownership percentage if funding is provided by Aurum		51.00%
Exploration expense funding commitment, maximum amount		$ 6,500,000
Specified period to meet funding requirements		5 years
Mining project option agreement date		Feb. 10, 2011
Potential ownership interest if Aurum exercises an option to acquire shares held by an unrelated investor		20.00%
Potential aggregate ownership interest if Aurum both provides specified funding amounts and exercises an option to acquire shares held by an unrelated investor		71.00%
Monthly required payment to preserve option rights	$ 55,000