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5. Property, Plant and Equipment: Property, Plant and Equipment (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Details    
Mill land $ 225,289njmc_MillLand $ 225,289njmc_MillLand
Mill building 536,193njmc_MillBuilding 522,786njmc_MillBuilding
Milling equipment 4,001,771njmc_MillingEquipment 3,716,011njmc_MillingEquipment
Mill buildings and improvements, accumulated depreciation (152,151)njmc_MillBuildingsAndImprovementsAccumulatedDepreciation (144,236)njmc_MillBuildingsAndImprovementsAccumulatedDepreciation
Mill Buildings and Improvements, Net 4,611,102njmc_MillBuildingsAndImprovementsNet 4,319,850njmc_MillBuildingsAndImprovementsNet
Buildings and Improvements, Gross 252,348us-gaap_BuildingsAndImprovementsGross 495,037us-gaap_BuildingsAndImprovementsGross
Buildings and improvements, accumulated depreciation (216,926)njmc_BuildingsAndImprovementsAccumulatedDepreciation (348,021)njmc_BuildingsAndImprovementsAccumulatedDepreciation
Buildings and improvements net 35,442njmc_BuildingsAndImprovementsNet 147,016njmc_BuildingsAndImprovementsNet
Land 1,007,675us-gaap_Land 441,858us-gaap_Land
Property, plant and equipment, net of accumulated depreciation $ 5,654,199us-gaap_PropertyPlantAndEquipmentNet $ 4,908,724us-gaap_PropertyPlantAndEquipmentNet