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9. Joint Venture Arrangements (Details) | 12 Months Ended
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Dec. 31, 2020
New Jersey Mill |
Equity Method Investment, Additional Information | In January 2011, the Company and United Mine Services, Inc. (“UMS”) entered into a joint venture agreement relating to the New Jersey mineral processing plant.
Butte Highlands JV, LLC |
Equity Method Investment, Additional Information | On January 29, 2016, the Company purchased a 50% interest in Butte Highlands JV, LLC (“BHJV”) for a total consideration of $435,000.

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- Definition This serves as a place to record data that is not required by accounting literature but is useful for readers of the financial statements as it relates to the details of an equity method investment in common stock. Such information may include the amount of change for a change in ownership (equity) percentage in a given period and the amount and type of the consideration given or received in relation to the change in ownership. + References No definition available. + Details
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