This folder contains correspondence and other documents relating to mining and ore milling. Among the documents for 1908 are items pertaining to relations with the Allis-Chalmers Co.; a balance sheet for the defunct Edison Iron Concentrating Co. covering the period 1890-1901; and letters enclosing ore samples or inquiring about Edison's interest in ore milling, mines, and ores.

Approximately 30 percent of the documents have been selected. The items not selected consist primarily of unsolicited inquiries, some of which contain perfunctory Edison marginalia indicating the desirability or the value of ores.