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CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (USD $) | Total USD ($) | 7.5% Series A-1 Convertible Preferred Stock [Member] USD ($) | 7.5% Series A-2 Convertible Preferred Stock [Member] USD ($) | 7.5% Series B Convertible Preferred Stock [Member] USD ($) | Preferred Stock [Member] 7.5% Series A-1 Convertible Preferred Stock [Member] USD ($) | Preferred Stock [Member] 7.5% Series A-2 Convertible Preferred Stock [Member] USD ($) | Preferred Stock [Member] 7.5% Series B Convertible Preferred Stock [Member] USD ($) | Common Stock [Member] USD ($) | Common Stock [Member] 7.5% Series A-1 Convertible Preferred Stock [Member] USD ($) | Common Stock [Member] 7.5% Series A-2 Convertible Preferred Stock [Member] USD ($) | Common Stock [Member] 7.5% Series B Convertible Preferred Stock [Member] USD ($) | Additional Paid-in Capital [Member] USD ($) | Additional Paid-in Capital [Member] 7.5% Series A-1 Convertible Preferred Stock [Member] USD ($) | Additional Paid-in Capital [Member] 7.5% Series A-2 Convertible Preferred Stock [Member] USD ($) | Additional Paid-in Capital [Member] 7.5% Series B Convertible Preferred Stock [Member] USD ($) | Accumulated Deficit [Member] USD ($) | Accumulated Deficit [Member] 7.5% Series A-1 Convertible Preferred Stock [Member] | Accumulated Deficit [Member] 7.5% Series A-2 Convertible Preferred Stock [Member] USD ($) | Accumulated Deficit [Member] 7.5% Series B Convertible Preferred Stock [Member] USD ($)
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BALANCE at Dec. 31, 2009 | $ (27,173,284) |  |  |  |  |  |  | $ 12,195 |  |  |  | $ 27,742,913 |  |  |  | $ (54,928,392) |  |  |
BALANCE, shares at Dec. 31, 2009 |  |  |  |  |  |  |  | 18,310,339 |  |  |  |  |  |  |  |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debenture principal/Payment of debt obligation | 835,483 |  |  |  |  |  |  | 468 |  |  |  | 835,015 |  |  |  |  |  |  |
Convertible debenture principal/Payment of debt obligation, shares |  |  |  |  |  |  |  | 703,770 |  |  |  |  |  |  |  |  |  |  |
Convertible debenture interest | 446,913 |  |  |  |  |  |  | 240 |  |  |  | 446,673 |  |  |  |  |  |  |
Convertible debenture interest, shares |  |  |  |  |  |  |  | 359,630 |  |  |  |  |  |  |  |  |  |  |
Employee and director compensation | 19,725 |  |  |  |  |  |  | 7 |  |  |  | 19,718 |  |  |  |  |  |  |
Employee and director compensation, shares |  |  |  |  |  |  |  | 10,000 |  |  |  |  |  |  |  |  |  |  |
Services | 34,000 |  |  |  |  |  |  | 17 |  |  |  | 33,983 |  |  |  |  |  |  |
Services, shares |  |  |  |  |  |  |  | 25,000 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation | 125,955 |  |  |  |  |  |  |  |  |  |  | 125,955 |  |  |  |  |  |  |
Cashless exercise of warrants and options | 2,156,149 |  |  |  |  |  |  | 1,058 |  |  |  | 2,155,091 |  |  |  |  |  |  |
Cashless exercise of warrants and options, shares |  |  |  |  |  |  |  | 1,589,995 |  |  |  |  |  |  |  |  |  |  |
Reclassification of warrant derivative liability | 2,686,431 |  |  |  |  |  |  |  |  |  |  | 2,686,431 |  |  |  |  |  |  |
Exchange of debt (principal and accrued interest) for convertible preferred stock | 72,559,141 |  |  |  | 14 | 6 |  |  |  |  |  | 72,559,121 |  |  |  |  |  |  |
Exchange of debt (principal and accrued interest) for convertible preferred stock, shares |  |  |  |  | 20,912 | 8,484 |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock |  | 2,127,787 |  | 35,749,400 | 1 |  | 24 |  |  |  |  |  | 2,127,786 |  | 35,749,376 |  |  |  |
Issuance of convertible preferred stock, shares |  |  |  |  | 863 |  | 35,749 |  |  |  |  |  |  |  |  |  |  |  |
Issuance costs on convertible preferred stock | (2,571,588) |  |  |  |  |  |  |  |  |  |  | (2,571,588) |  |  |  |  |  |  |
Contingent dividend related to convertible preferred stock | (2,003,688) |  |  |  |  |  |  |  |  |  |  | (2,003,688) |  |  |  |  |  |  |
Deemed dividend on beneficial conversion feature related to convertible preferred stock | 39,482,123 |  |  |  |  |  |  |  |  |  |  | 39,482,123 |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock |  |  |  |  |  | (1) |  |  |  | 104 |  |  |  | (103) |  |  |  |  |
Conversion of convertible preferred stock into common stock, shares |  |  |  |  |  | (102) |  |  |  | 155,929 |  |  |  |  |  |  |  |  |
Net loss | (60,326,419) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (60,326,419) |  |  |
BALANCE at Dec. 31, 2010 | 24,666,005 |  |  |  | 15 | 5 | 24 | 14,089 |  |  |  | 139,906,683 |  |  |  | (115,254,811) |  |  |
BALANCE, shares at Dec. 31, 2010 |  |  |  |  | 21,775 | 8,382 | 35,749 | 21,154,663 |  |  |  |  |  |  |  |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee and director compensation | 980,000 |  |  |  |  |  |  | 200 |  |  |  | 979,800 |  |  |  |  |  |  |
Employee and director compensation, shares |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |
Payment of dividends | 0 |  |  |  |  |  |  | 782 |  |  |  | (782) |  |  |  |  |  |  |
Payment of dividends, shares |  |  |  |  |  |  |  | 1,174,604 |  |  |  |  |  |  |  |  |  |  |
Purchase of mineral property, properties, plant and equipment | 430,000 |  |  |  |  |  |  | 128 |  |  |  | 429,872 |  |  |  |  |  |  |
Purchase of mineral property, properties, plant and equipment, shares |  |  |  |  |  |  |  | 192,600 |  |  |  |  |  |  |  |  |  |  |
Services | 8,125 |  |  |  |  |  |  | 2 |  |  |  | 8,123 |  |  |  |  |  |  |
Services, shares |  |  |  |  |  |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock | 1,931,999 |  |  |  |  |  |  |  |  |  |  | 1,931,999 |  |  |  |  |  |  |
Issuance of convertible preferred stock, shares |  | 862.5 |  |  | 862 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent dividend related to convertible preferred stock | (15,954) |  |  |  |  |  |  |  |  |  |  | (15,954) |  |  |  |  |  |  |
Deemed dividend on beneficial conversion feature related to convertible preferred stock | 638,276 |  |  |  |  |  |  |  |  |  |  | 638,276 |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock |  |  |  |  |  | (1) | (4) |  |  | 1,749 | 2,358 |  |  | (1,748) | (2,354) |  |  |  |
Conversion of convertible preferred stock into common stock, shares |  |  |  |  |  | (1,710) | (5,842) |  |  | 2,625,514 | 3,540,749 |  |  |  |  |  |  |  |
Stock-based compensation | 203,731 |  |  |  |  |  |  |  |  |  |  | 203,731 |  |  |  |  |  |  |
Net loss | (11,606,231) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,606,231) |  |  |
BALANCE at Dec. 31, 2011 | 16,597,675 |  |  |  | 15 | 4 | 20 | 19,308 |  |  |  | 143,439,370 |  |  |  | (126,861,042) |  |  |
BALANCE, shares at Dec. 31, 2011 |  |  |  |  | 22,637 | 6,672 | 29,907 | 28,990,630 |  |  |  |  |  |  |  |  |  |  |
Common stock issued for: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible debenture principal/Payment of debt obligation | 75,000 |  |  |  |  |  |  | 21 |  |  |  | 74,979 |  |  |  |  |  |  |
Convertible debenture principal/Payment of debt obligation, shares |  |  |  |  |  |  |  | 31,721 |  |  |  |  |  |  |  |  |  |  |
Public offering | 26,549,997 |  |  |  |  |  |  | 8,875 |  |  |  | 26,541,122 |  |  |  |  |  |  |
Public offering, shares |  |  |  |  |  |  |  | 13,325,521 |  |  |  |  |  |  |  |  |  |  |
Public offering issuance costs | (2,858,871) |  |  |  |  |  |  |  |  |  |  | (2,858,871) |  |  |  |  |  |  |
Vested restricted stock |  |  |  |  |  |  |  | 406 |  |  |  | (406) |  |  |  |  |  |  |
Vested restricted stock, shares |  |  |  |  |  |  |  | 609,500 |  |  |  |  |  |  |  |  |  |  |
Payment of dividends |  |  |  |  |  |  |  | 1,431 |  |  |  | (1,431) |  |  |  |  |  |  |
Payment of dividends, shares |  |  |  |  |  |  |  | 2,148,934 |  |  |  |  |  |  |  |  |  |  |
Purchase of mineral property, properties, plant and equipment | 444,700 |  |  |  |  |  |  | 114 |  |  |  | 444,586 |  |  |  |  |  |  |
Purchase of mineral property, properties, plant and equipment, shares |  |  |  |  |  |  |  | 170,986 |  |  |  |  |  |  |  |  |  |  |
Cashless exercise of warrants and options |  |  |  |  |  |  |  | 82 |  |  |  | (82) |  |  |  |  |  |  |
Cashless exercise of warrants and options, shares |  |  |  |  |  |  |  | 122,848 |  |  |  |  |  |  |  |  |  |  |
Issuance of convertible preferred stock | 2,466,750 |  |  |  | 1 |  |  |  |  |  |  | 2,466,749 |  |  |  |  |  |  |
Issuance of convertible preferred stock, shares |  | 862.5 |  |  | 862 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent dividend related to convertible preferred stock | (6,009) |  |  |  |  |  |  |  |  |  |  | (6,009) |  |  |  |  |  |  |
Deemed dividend on beneficial conversion feature related to convertible preferred stock | 1,242,927 |  |  |  |  |  |  |  |  |  |  | 1,242,927 |  |  |  |  |  |  |
Conversion of convertible preferred stock into common stock |  |  |  |  |  |  | (1) |  |  | 1,433 | 609 |  |  | (1,432) | (608) |  |  |  |
Conversion of convertible preferred stock into common stock, shares |  |  |  |  |  | (1,401) | (1,508) |  |  | 2,152,217 | 913,910 |  |  |  |  |  |  |  |
Stock-based compensation | 5,887,593 |  |  |  |  |  |  |  |  |  |  | 5,887,593 |  |  |  |  |  |  |
Net loss | (30,762,273) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (30,762,273) |  |  |
BALANCE at Dec. 31, 2012 | $ 18,394,562 |  |  |  | $ 16 | $ 4 | $ 19 | $ 32,279 |  |  |  | $ 175,985,559 |  |  |  | $ (157,623,315) |  |  |
BALANCE, shares at Dec. 31, 2012 |  |  |  |  | 23,499 | 5,271 | 28,399 | 48,466,267 |  |  |  |  |  |  |  |  |  |  |

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