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New Jersey Mining Company Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net income (loss) $ 1,723,131 $ (89,780)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:    
Depreciation and amortization 145,564 59,991
Amortization of discount on note payable   26,274
Accretion of asset retirement obligation 7,007 3,988
Stock based compensation 27,140 73,137
Change in fair value of forward gold contracts 7,887 141,596
Gain on sale of mineral property (2,947,862)  
Change in operating assets and liabilities:    
Milling receivables   10,500
Gold sales receivable 271,331 (183,236)
Inventories 82,744 209
Joint venture receivable 573 (4,718)
Other current assets (814) 2,328
Accounts payable and other accrued liabilities (4,096) (34,749)
Accrued payroll and related payroll expenses 19,886 (4,752)
Interest payable to related parties (10,772) 9,835
Net cash provided (used) by operating activities (678,281) 10,623
Cash flows from investing activities:    
Issuance of note receivable (250,000) (250,000)
Proceeds from sale of mineral property 3,000,000  
Purchases of property, plant and equipment (242,603) (67,275)
Purchase of mineral property (257,619) (5,125)
Deposit on equipment (10,330)  
Purchase of reclamation bond   (45,320)
Net cash provided (used) by investing activities 2,239,448 (117,720)
Cash flows from financing activities:    
Sales of common stock and warrants, net of issuance costs 1,107,571 1,041,000
Proceeds from exercise of stock options 1,200  
Payments on forward gold contracts (126,287) (175,828)
Gold purchased for payments on forward gold contracts (172,113) (157,887)
Principal payments on notes payable (193,320) (396,192)
Principal payments on notes payable, related parties (1,014,770) (53,657)
Contributions from non-controlling interest 13,456 14,903
Net cash provided (used) by financing activities (384,263) 272,339
Net change in cash and cash equivalents 1,176,904 165,242
Cash and cash equivalents, beginning of period 124,617 154,833
Cash and cash equivalents, end of period 1,301,521 320,075
Non-cash investing and financing activities:    
Deposit on equipment applied to purchase of equipment 30,000  
Equipment purchases financed with notes payable 456,964  
Forward gold contract exchanged for note payable, related party 492,783  
Mineral property acquired with payable and shares of common stock $ 826,587 $ 100,000