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Document and Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Mar. 01, 2021
Jun. 30, 2020
Details      
Registrant CIK 0001030192    
Fiscal Year End --12-31    
Registrant Name NEW JERSEY MINING CO    
SEC Form 10-K    
Period End date Dec. 31, 2020    
Trading Symbol njmc    
Trading Exchange NONE    
Tax Identification Number (TIN) 82-0490295    
Number of common stock shares outstanding   137,573,309  
Public Float     $ 25,057,553
Filer Category Non-accelerated Filer    
Current with reporting Yes    
Interactive Data Current Yes    
Voluntary filer No    
Well-known Seasoned Issuer No    
Shell Company false    
Small Business true    
Emerging Growth Company false    
Document Annual Report true    
Document Transition Report false    
Entity File Number 000-28837    
Entity Incorporation, State or Country Code ID    
Entity Address, Address Line One 201 N. Third Street    
Entity Address, City or Town Coeur d’Alene    
Entity Address, State or Province ID    
Entity Address, Postal Zip Code 83814    
City Area Code 208    
Local Phone Number 625-9001    
Title of 12(g) Security Common Stock, no par value    
Amendment Flag false    
Document Fiscal Year Focus 2020    
Document Fiscal Period Focus FY