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New Jersey Mining Company Consolidated Statements of Cash Flows (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net loss $ (265,846) $ (274,178)
Adjustments to reconcile net loss to net cash provided (used) by operating activities:    
Depreciation and amortization 69,061 27,280
Amortization of discount on note payable   14,518
Accretion of asset retirement obligation 4,013 1,803
Stock based compensation 16,635 33,504
Change in fair value of forward gold contracts 10,019 143,214
Change in operating assets and liabilities:    
Gold sales receivables 211,984 (79,175)
Inventories 58,162 8,966
Joint venture receivable (718) (5,650)
Other current assets (27,811) 20,822
Accounts payable (10,672) 5,132
Accrued payroll and related payroll expenses 1,779 869
Interest payable related parties 3,659 5,516
Net cash provided (used) by operating activities 70,265 (97,379)
Cash flows from investing activities:    
Purchases of property, plant and equipment (182,634) (23,855)
Purchase of mineral property (7,179) (5,125)
Net cash provided (used) by investing activities (189,813) (28,980)
Cash flows from financing activities:    
Sales of common stock and warrants, net of issuance costs 607,570 1,041,000
Payments on forward gold contracts in cash (62,900) (81,724)
Gold purchased for payments on forward gold contracts (84,214) (83,515)
Principal payments on notes payable (48,871) (260,169)
Principal payments on notes payable, related parties (42,852) (22,411)
Contributions from non-controlling interest 5,400 5,650
Net cash provided (used) by financing activities 374,133 598,831
Net change in cash and cash equivalents 254,585 472,472
Cash and cash equivalents, beginning of period 124,617 154,833
Cash and cash equivalents, end of period 379,202 627,305
Non-cash investing and financing activities:    
Deposit on equipment applied to purchase of equipment 30,000  
Note payable for equipment purchase 125,000  
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