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Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2020
Aug. 01, 2020
Details    
Registrant CIK 0001030192  
Fiscal Year End --12-31  
Registrant Name NEW JERSEY MINING COMPANY  
SEC Form 10-Q  
Period End date Jun. 30, 2020  
Trading Symbol NJMC  
Trading Exchange NONE  
Tax Identification Number (TIN) 82-0490295  
Number of common stock shares outstanding   125,571,403
Filer Category Non-accelerated Filer  
Current with reporting Yes  
Interactive Data Current Yes  
Shell Company false  
Small Business true  
Emerging Growth Company 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 Q2  
Document Quarterly Report true  
Document Transition Report false