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

X
- Definition Depreciation and amortization expense of Mineral Rights + References No definition available. + Details
Name: | fil_DepletionOfMineralRights
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Depreciation and amortization expense included in operations + References No definition available. + Details
Name: | fil_DepreciationAndAmortizationExpenseIncludedInOperations
Namespace Prefix: | fil_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | fil_DepreciationAndAmortizationExpenseIncludedInOperationsAbstract
Namespace Prefix: | fil_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration