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11. Equity (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Details    
Common Stock, Shares Authorized 200,000,000us-gaap_CommonStockSharesAuthorized 200,000,000us-gaap_CommonStockSharesAuthorized
Preferred Stock, Shares Authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Stock options issued to management 2,250,000njmc_ShareBasedCompensationStockOptionsIssuedToManagement1  
Stock options issued to management Value $ 173,844njmc_ShareBasedCompensationStockOptionsIssuedToManagement1Value  
Stock options issued to management 500,000njmc_ShareBasedCompensationStockOptionsIssuedToOfficer  
Stock options issued to officer value 36,250njmc_ShareBasedCompensationStockOptionsIssuedToOfficerValue  
Stock options issued to management 1,750,000njmc_ShareBasedCompensationStockOptionsIssuedToManagement2  
Stock options issued to management Value 116,153njmc_ShareBasedCompensationStockOptionsIssuedToManagement2Value  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures   150,000us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Other General and Administrative Expense   7,250us-gaap_OtherGeneralAndAdministrativeExpense
Units Issued in connection with private placement for cash 3,000,000njmc_UnitIssuedInConnectionWithPrivatePlacementForCash 22,000,000njmc_UnitIssuedInConnectionWithPrivatePlacementForCash
Units Issued in connection with private placement Net Proceeds 405,000njmc_UnitIssuedInConnectionWithPrivatePlacementNetProceeds 990,000njmc_UnitIssuedInConnectionWithPrivatePlacementNetProceeds
Units Issued in connection with private placement 2   200,000njmc_UnitIssuedInConnectionWithPrivatePlacement2
Units Issued in connection with private placement value 2   10,000njmc_UnitIssuedInConnectionWithPrivatePlacementValue2
Units Issued in connection with private placement Description   units consisting of 6,000,000 shares and 3,000,000 warrants
Units Issued in connection with private placement for cash 2 per unit value $ 0.20njmc_UnitIssuedInConnectionWithPrivatePlacementForCash2PerUnitValue  
Units Issued in connection with private placement for cash 2 6,000,000njmc_UnitIssuedInConnectionWithPrivatePlacementForCash2  
Units Issued in connection with private placement Net Proceeds 2 1,080,000njmc_UnitIssuedInConnectionWithPrivatePlacementNetProceeds2  
Agent Warrants Issued in connection with private placement Net Proceeds 1,200,000njmc_AgentWarrantsIssuedInConnectionWithPrivatePlacement  
Agent Warrants Issued in connection with private placement per warrant value $ 0.10njmc_AgentWarrantsIssuedInConnectionWithPrivatePlacementPerWarrantValue  
Issuance of common stock and warrants for mineral property agreement, stock   5,180,000njmc_CommonStockIssuedForMineralPropertiesAgreementStock
Common stock issued for mineral properties   259,000njmc_CommonStockIssuedForMineralPropertiesAgreement
Issuance of common stock and warrants for exploration, stock   714,286us-gaap_StockIssuedDuringPeriodSharesOther
Non-controlling interest in GF&H Company $ 50,000us-gaap_NoncashOrPartNoncashAcquisitionInvestmentsAcquired1