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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Jun. 30, 2014
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2014    
Entity Registrant Name New Jersey Mining Company    
Entity Central Index Key 0001030192    
Current Fiscal Year End Date --12-31    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   91,760,148dei_EntityCommonStockSharesOutstanding  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well Known Seasoned Issuer No    
Entity Public Float     $ 7,346,165dei_EntityPublicFloat
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Entity Incorporation, State Country Name Idaho    
Entity Incorporation, Date of Incorporation Jul. 18, 1996