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Consolidated Balance Sheets - USD ($)
Dec. 31, 2020
Dec. 31, 2019
Current assets:    
Cash and cash equivalents $ 665,102 $ 115,506
Certificates of deposit 254,212 253,552
Accounts receivable 238,634 284,453
Inventories 650,213 626,244
Total current assets 1,808,161 1,279,755
Properties, plants and equipment, net 11,225,594 12,186,848
Restricted cash for reclamation bonds 57,275 57,261
IVA receivable and other assets 208,472 170,111
Total assets 13,299,502 13,693,975
Current liabilities:    
Checks issued and payable 86,685 17,633
Accounts payable 1,876,874 2,328,977
Payables to related party 227,432 359,309
Accrued liabilities 635,626 638,288
Notes payable to bank 100,000 197,066
Export tax assessment payable (Note 13) 1,120,730 0
Hillgrove advances payable (Note 10) 378,074 378,074
Long-term debt, current portion, net of discount 52,122 56,334
Total current liabilities 4,477,543 3,975,681
Long-term debt, net of current portion 34,304 76,762
Hillgrove advances payable (Note 10) 756,147 756,147
CARES Act note payable 443,400 0
Stock payable to directors for services 110,000 134,375
Asset retirement obligation and accrued reclamation costs 291,719 283,868
Total liabilities 6,113,113 5,226,833
Commitments and contingencies (Notes 13 and 15)
Stockholders' equity:    
Common stock, $0.01 par value, 150,000,000 shares authorized; 75,949,757 and 69,661,436 shares issued and outstanding, respectively 759,496 696,614
Additional paid-in capital 39,050,899 37,107,730
Accumulated deficit (32,650,794) (29,363,990)
Total stockholders' equity 7,186,389 8,467,142
Total liabilities and stockholders' equity 13,299,502 13,693,975
Series A Preferred Stock    
Stockholders' equity:    
Preferred stock 0 0
Series B Preferred Stock    
Stockholders' equity:    
Preferred stock 7,500 7,500
Series C Preferred Stock    
Stockholders' equity:    
Preferred stock 1,779 1,779
Series D Preferred Stock    
Stockholders' equity:    
Preferred stock $ 17,509 $ 17,509