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SIGNIFICANT ACCOUNTING POLICIES - Depreciation (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Depreciation and amortization expense included in operations      
Depreciation and amortization expense included in operations $ 176,000fil_DepreciationAndAmortizationExpenseIncludedInOperations $ 188,000fil_DepreciationAndAmortizationExpenseIncludedInOperations $ 165,000fil_DepreciationAndAmortizationExpenseIncludedInOperations
Depletion of mineral rights $ 510,000fil_DepletionOfMineralRights $ 650,000fil_DepletionOfMineralRights $ 614,000fil_DepletionOfMineralRights