CONSOLIDATED BALANCE SHEETS - USD ($)
|
Jun. 30, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
| CURRENT ASSETS: |
|
|
|
| Cash and cash equivalents |
$ 5,501,245
|
$ 12,858,873
|
$ 11,722,102
|
| Prepaid expenses and other current assets |
708,533
|
1,006,779
|
1,139,760
|
| Deposit |
62,667
|
27,884
|
0
|
| Total Current Assets |
6,272,445
|
13,893,536
|
12,861,862
|
| NON - CURRENT ASSETS: |
|
|
|
| Property and equipment, net |
2,837,443
|
3,303,366
|
4,310,980
|
| Mineral rights |
22,873,912
|
22,803,912
|
22,786,912
|
| Restricted cash |
3,690,000
|
3,690,000
|
2,250,000
|
| Reclamation bond deposit |
50,000
|
50,000
|
25,000
|
| Other non-current assets |
20,596
|
9,689
|
3,884
|
| Total Non - Current Assets |
29,471,951
|
29,856,967
|
29,376,776
|
| Total Assets |
35,744,396
|
43,750,503
|
42,238,638
|
| CURRENT LIABILITIES: |
|
|
|
| Accounts payable and accrued expenses |
1,364,547
|
1,651,461
|
2,150,195
|
| Deferred rent - current portion |
645
|
4,513
|
6,738
|
| Deposit |
1,750
|
1,750
|
0
|
| Total Current Liabilities |
1,366,942
|
1,657,724
|
2,156,933
|
| LONG-TERM LIABILITIES: |
|
|
|
| Deposit |
|
0
|
1,750
|
| Deferred rent - long term portion |
|
0
|
4,512
|
| Asset retirement obligation |
980,930
|
963,303
|
895,085
|
| Total Liabilities |
2,347,872
|
2,621,027
|
3,058,280
|
| Commitments and Contingencies |
|
|
|
| STOCKHOLDERS' EQUITY : |
|
|
|
| Common stock ($0.0001 Par Value; 200,000,000 Shares Authorized; 33,544,125 and 28,389,378 shares issued and outstanding as of December 31, 2017 and 2016) |
3,363
|
3,354
|
2,839
|
| Additional paid-in capital |
212,349,059
|
211,817,072
|
195,705,344
|
| Accumulated deficit |
(178,955,899)
|
(170,690,951)
|
(156,527,826)
|
| Total Stockholders' Equity |
33,396,524
|
41,129,476
|
39,180,358
|
| Total Liabilities and Stockholders' Equity |
35,744,396
|
43,750,503
|
42,238,638
|
| Convertible Series A Preferred Stock |
|
|
|
| STOCKHOLDERS' EQUITY : |
|
|
|
| Preferred Stock, Value, Issued |
0
|
0
|
0
|
| Convertible Series B Preferred Stock |
|
|
|
| STOCKHOLDERS' EQUITY : |
|
|
|
| Preferred Stock, Value, Issued |
0
|
0
|
0
|
| Convertible Series C Preferred Stock |
|
|
|
| STOCKHOLDERS' EQUITY : |
|
|
|
| Preferred Stock, Value, Issued |
0
|
0
|
0
|
| Convertible Series D Preferred Stock |
|
|
|
| STOCKHOLDERS' EQUITY : |
|
|
|
| Preferred Stock, Value, Issued |
0
|
0
|
0
|
| Convertible Series E Preferred Stock |
|
|
|
| STOCKHOLDERS' EQUITY : |
|
|
|
| Preferred Stock, Value, Issued |
$ 1
|
$ 1
|
$ 1
|