Federal Income Taxes - Schedule of Components of Future Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Net operating loss carryforwards	$ 71,882	$ 63,539
Mineral properties	11,375	14,153
Equipment & Furniture	133	127
Restoration Reserves	1,360	1,303
Stock-based compensation	199
Derivatives		37
Deferred tax assets	84,949	79,159
Valuation allowance	(82,435)	(78,544)
Net	2,514us-gaap_DeferredTaxAssetsNetNoncurrent	615us-gaap_DeferredTaxAssetsNetNoncurrent
Prepaids and other	100	50
Deferred tax liabilities current	100us-gaap_DeferredTaxLiabilitiesCurrent	50us-gaap_DeferredTaxLiabilitiesCurrent
Equipment & Furniture	(956)
Derivatives	(1,658)	(665)
Deferred tax liabilities noncurrent	(2,614)	(665)
Deferred tax liabilities	(2,514)us-gaap_DeferredTaxLiabilities	(615)us-gaap_DeferredTaxLiabilities
Net deferred tax asset (liability)

Deferred tax assets mineral properties noncurrent.

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Deferred tax assets restoration reserves noncurrent.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from derivative instruments.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards, net of deferred tax liability attributable to taxable temporary differences.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from property, plant, and equipment.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences net of deferred tax asset attributable to deductible temporary differences and carryforwards after valuation allowances.

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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Amount of deferred tax consequences attributable to taxable temporary differences derived from prepaid expenses.

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