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Final Purchase Price Allocation (Detail) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Schedule of Business Acquisitions, Purchase Price Allocation [Line Items]    
Tonopah mine tailings $ 24,888,252smpr_BusinessAcquisitionPurchasePriceAllocationsMineralRights  
Tonopah dormant milling facility 8,062,875smpr_BusinessAcquisitionPurchasePriceAllocationsPlant  
Tonopah land 1,760,000smpr_BusinessAcquisitionspurchasePriceAllocationLand  
Tonopah water rights 348,300smpr_BusinessAcquisitionsPurchasePriceAllocationNaturalResources  
Manhattan mine dumps 100,000smpr_BusinessAcquisitionsPurchasePriceAllocationOtherAssets  
Total $ 35,159,427smpr_BusinessAcquisitionCostOfAcquiredEntityPurchasePrices $ 35,159,427smpr_BusinessAcquisitionCostOfAcquiredEntityPurchasePrices