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2. Summary of Significant Accounting Policies: Accounting For Investments in Joint Ventures: Schedule of Cost Method Investments (Details) | Dec. 31, 2014 | Dec. 31, 2013
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Investment Owned, Percent of Net Assets | 66.00%us-gaap_InvestmentOwnedPercentOfNetAssets | 66.00%us-gaap_InvestmentOwnedPercentOfNetAssets
investment owned percentage of net assets 2 | 48.00%njmc_InvestmentOwnedPercentageOfNetAssets2 | 48.00%njmc_InvestmentOwnedPercentageOfNetAssets2

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- Definition Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph 2 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.3) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611133-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column D.2) -URI http://asc.fasb.org/extlink&oid=34726532&loc=d3e611225-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Paragraph 3 -Article 12 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12C -Paragraph Column D -Article 12 + Details
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