2.4.0.8139 - Disclosure - Option agreement (Detail)truefalsefalse1false USDfalsefalse$eol_PE793818--1310-Q0005_STD_182_20120430_0_705999x709155_735149x795004http://www.sec.gov/CIK0001450708duration2011-11-01T00:00:002012-04-30T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$eol_PE793818--1310-Q0005_STD_273_20130731_0_705999x709155_735149x795004http://www.sec.gov/CIK0001450708duration2012-11-01T00:00:002013-07-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$eol_PE793818--1310-Q0005_STD_365_20111031_0_705999x709155_735149x795004http://www.sec.gov/CIK0001450708duration2010-11-01T00:00:002011-10-31T00:00:00iso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse1false USDtruefalse$eol_PE793818--1310-Q0005_STD_182_20120430_0_705999x709155_735149x795004http://www.sec.gov/CIK0001450708duration2011-11-01T00:00:002012-04-30T00:00:00falsefalseCentury Thrust Joint Venture Agreement [Member]dei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_CorporateJointVentureMemberdei_LegalEntityAxisexplicitMemberfalsefalseCentury Concession in Laos [Member]aurm_MiningProjectAxisxbrldihttp://xbrl.org/2006/xbrldiaurm_CenturyConcessionMemberaurm_MiningProjectAxisexplicitMemberiso4217_USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse0Century Thrust Joint Venture Agreement [Member] | Century Concession in Laos [Member]2true 3aurm_MineralRightsLineItemsaurm_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Mineral Rights [Line Items]3false 4aurm_MiningProjectOptionFeesPaidaurm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse405000405000USD$falsetruefalsexbrli:monetaryItemTypemonetaryThe aggregate amount of fees paid to an unrelated third party to obtain or preserve rights to exploit a mining project.No definition available.false2Mining project, option fees paid, capitalized4false 4aurm_CostsAssociatedWithMiningProjectOptionAgreementaurm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse2000020000USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe direct and indirect costs incurred, that are associated with a mining project.No definition available.false2Costs associated with mining project, capitalized5false 4aurm_ExercisePriceOfMiningProjectOptionaurm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2truefalsefalse13500001350000USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe purchase price to obtain the rights offered in a mining project option agreement.No definition available.false2Mining project, exercise price of option6false 4aurm_MiningProjectWritedownOfPreviouslyCapitalizedCostsaurm_falsedebitdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse425000425000USD$falsetruefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe charge against earnings to write-off capitalized costs resulting from abandonment of a mining project or a shutdown for other reasons during the period.No definition available.false2Mining project, write-down of previously capitalized costsfalseOption agreement (Detail) (Century Thrust Joint Venture Agreement [Member], Century Concession in Laos [Member], USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://auruminc.net/taxonomy/role/DisclosureOptionAgreement36