This folder contains correspondence and other documents relating to mining and ore milling. Included are letters about Edison's mining operations at Ogden and about the use of his patent for electrolytic decomposition in the processing of aluminum. There are also items pertaining to a claim for compensation by consulting engineer John Birkinbine and several letters from the firm of Pilling & Crane regarding market conditions and the cost of labor and materials. Also included are a few unsolicited inquiries about mining matters that received a significant response from Edison.

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