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Debt and Debt Guarantee - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | 2 Months Ended | 12 Months Ended | 1 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 6 Months Ended | |||||||||||||||||
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Apr. 30, 2012
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Mar. 31, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Jun. 30, 2011
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Jun. 30, 2012
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Jun. 30, 2011
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2011
Notes Payable - other
Installment
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Mar. 26, 2012
Notes Payable
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Mar. 31, 2012
Notes Payable
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Dec. 31, 2011
Notes Payable
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Dec. 31, 2010
Notes Payable
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Apr. 30, 2012
24% Note Transaction
Demand Notes Payable
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Jun. 30, 2012
24% Note Transaction
Demand Notes Payable
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Dec. 31, 2011
24% Note Transaction
Demand Notes Payable
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Apr. 30, 2012
6% Note Transaction
Demand Notes Payable
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Jun. 30, 2012
6% Note Transaction
Demand Notes Payable
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Dec. 31, 2011
6% Note Transaction
Demand Notes Payable
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Sep. 30, 2009
Convertible Debentures - 2009
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Dec. 31, 2010
Convertible Debentures - 2009
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Jun. 30, 2012
Convertible Debentures - 2009
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Dec. 31, 2011
Convertible Debentures - 2009
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Aug. 13, 2011
Convertible Debentures - 2009
Second Amended And Restated Credit Agreement
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Jul. 31, 2011
Convertible Debentures - 2010
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Jun. 30, 2012
Convertible Debentures - 2010
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Dec. 31, 2011
Convertible Debentures - 2010
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Dec. 31, 2010
Convertible Debentures - 2010
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Dec. 31, 2009
Convertible Debentures - 2010
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May 31, 2011
Convertible Debentures - 2010
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Jul. 31, 2011
Convertible Debentures - 2010
Amended and Restated Credit Agreement
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May 31, 2011
Convertible Debentures - 2010
Amended and Restated Credit Agreement
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Nov. 30, 2010
Convertible Debentures - 2010
Amended and Restated Credit Agreement
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Jun. 30, 2012
Convertible Debentures - 2010
Second Amended And Restated Credit Agreement
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Dec. 31, 2011
Convertible Debentures - 2010
Transaction debenture 2
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Mar. 31, 2012
Convertible Debentures - 2010
Transaction Debenture 1
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Dec. 31, 2011
Convertible Debentures - 2010
Transaction Debenture 1
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Dec. 31, 2010
Convertible Debentures - 2010
Transaction Debenture 1
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Jun. 30, 2012
Convertible Debentures
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||||||||
| Notes payable | $ 202,484 | $ 25,000 | $ 25,000 | $ 71,000 | $ 79,980 | |||||||||||||||||||||||||||||||||||
| Debt interest rate | 12.00% | 12.00% | 24.00% | 6.00% | ||||||||||||||||||||||||||||||||||||
| Accrued interest Expense | 75,115 | 372,133 | 460,704 | 783,360 | 1,244 | 5,082 | 6,211 | 5,929 | 2,688 | 0 | ||||||||||||||||||||||||||||||
| Note payable and accrued interest | 46,819 | 45,575 | 83,140 | 76,929 | 82,668 | |||||||||||||||||||||||||||||||||||
| Number of common stock due to conversion of Note payable and accrued interest | 187,277 | 332,561 | 330,671 | |||||||||||||||||||||||||||||||||||||
| Common stock, fair market value per share | $ 0.25 | $ 0.25 | $ 0.25 | |||||||||||||||||||||||||||||||||||||
| Acquisition of mineral properties | 300,000 | |||||||||||||||||||||||||||||||||||||||
| Acquisition of mineral properties, cash paid | 50,000 | |||||||||||||||||||||||||||||||||||||||
| Acquisition of mineral properties, notes payable assumed | 250,000 | |||||||||||||||||||||||||||||||||||||||
| Number of installment for acquisition payment | 3 | |||||||||||||||||||||||||||||||||||||||
| Debt, maturity start date | Oct. 31, 2011 | Aug. 13, 2010 | Aug. 13, 2012 | |||||||||||||||||||||||||||||||||||||
| Debt, maturity end date | Dec. 31, 2011 | Sep. 15, 2010 | Sep. 15, 2012 | |||||||||||||||||||||||||||||||||||||
| Short term note from officer | 39,200 | 39,200 | ||||||||||||||||||||||||||||||||||||||
| Convertible debenture, face amount | 1,000,000 | 198,000 | 1,462,774 | 1,700,918 | ||||||||||||||||||||||||||||||||||||
| Convertible debenture, interest rate | 18.00% | 24.00% | ||||||||||||||||||||||||||||||||||||||
| Convertible debenture, expected principal payment | 500,000 | |||||||||||||||||||||||||||||||||||||||
| Convertible debenture, conversion price per share | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.25 | $ 0.35 | $ 0.35 | $ 0.25 | $ 0.90 | $ 0.25 | |||||||||||||||||||||||||||||||
| Convertible debenture, conversion price as percentage of five proceeding days of weighted average closing price | 25.00% | 25.00% | ||||||||||||||||||||||||||||||||||||||
| Warrants issued (in shares) | 442,857 | 2,857,142 | 2,857,142 | 2,857,142 | ||||||||||||||||||||||||||||||||||||
| Warrants exercise price | 0.40 | 0.40 | 0.40 | 0.50 | 0.50 | 0.50 | 0.50 | |||||||||||||||||||||||||||||||||
| Number of days used to determining conversion price | 5 days | 5 days | ||||||||||||||||||||||||||||||||||||||
| Warrant exercise term | 2 years | 2 years | 2 years | |||||||||||||||||||||||||||||||||||||
| Convertible debenture, discount to average closing price of five proceeding days | $ 0.25 | |||||||||||||||||||||||||||||||||||||||
| Warrants issued with debt | 581,626 | |||||||||||||||||||||||||||||||||||||||
| Convertible debenture converted to stock (in shares) | 1,725,580 | 10,927,289 | 4,363,611 | 1,000,000 | ||||||||||||||||||||||||||||||||||||
| Convertible debenture converted to stock | 431,395 | 2,731,822 | 3,163,218 | 1,090,902 | 350,000 | |||||||||||||||||||||||||||||||||||
| Convertible debenture | 633,306 | 633,306 | 2,164,205 | |||||||||||||||||||||||||||||||||||||
| Convertible debenture, maturity date | May 17, 2011 | |||||||||||||||||||||||||||||||||||||||
| Beneficial conversion feature issued on convertible debenture | 472,377 | 472,377 | 515,271 | |||||||||||||||||||||||||||||||||||||
| Amortization of Discount on convertible debenture | 212,070 | 444,993 | 646,760 | 512,839 | 260,306 | 202,517 | 386,453 | |||||||||||||||||||||||||||||||||
| Line of credit facility, maximum borrowing capacity | 1,800,000 | 1,500,000 | 2,000,000 | 1,800,000 | 3,000,000 | |||||||||||||||||||||||||||||||||||
| Line of credit facility, royalty interest rate | 3.00% | 6.00% | 6.00% | 3.00% | ||||||||||||||||||||||||||||||||||||
| Line of credit facility amended payment period, due | 1 year | |||||||||||||||||||||||||||||||||||||||
| Line of credit facility amended payment period | Nov. 17, 2012 | |||||||||||||||||||||||||||||||||||||||
| Prepaid royalty interest | 113,164 | 113,164 | ||||||||||||||||||||||||||||||||||||||
| Amortized prepaid financing charge | 42,437 | 35,364 | ||||||||||||||||||||||||||||||||||||||
| Prepaid expenses | (39,812) | (4,257) | 77,800 | |||||||||||||||||||||||||||||||||||||
| Royalty paid | 4,418 | |||||||||||||||||||||||||||||||||||||||
| Royalty earned | 4,418 | |||||||||||||||||||||||||||||||||||||||
| Gain on forgiveness of debt | 235,985 | 86,746 | 322,731 | 77,800 | 158,185 | |||||||||||||||||||||||||||||||||||
| Convertible debenture, discount | $ 0 | $ 212,070 | ||||||||||||||||||||||||||||||||||||||