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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2011
Mar. 01, 2012
Jun. 30, 2011
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2011    
Trading Symbol njmc    
Entity Registrant Name NEW JERSEY MINING CO    
Entity Central Index Key 0001030192    
Current Fiscal Year End Date --12-31    
Entity Filer Category Smaller Reporting Company    
Entity Common Stock, Shares Outstanding   45,305,862  
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well Known Seasoned Issuer No    
Entity Public Float     $ 8,020,000
Document Fiscal Year Focus 2011    
Document Fiscal Period Focus FY