This folder contains correspondence and other documents relating to mining and ore milling. Included are letters about the use of Edison's ore milling process in the French West Indies and the reissue of Frank McGowan's stock in the Edison Ore Milling Co.

Approximately 20 percent of the documents have been selected. The following items have not been selected: routine correspondence regarding A. H. Lloyd of Chicago, the operation of the Spurr Mountain mine, and the business of the Edison Iron Concentrating Co.; nonsubstantive letters about ore samples sent to Edison; letters from Josiah C. Reiff concerning a copper mining venture; letters about a $12,000 promissory note from Edison and the New Jersey & Pennsylvania Concentrating Works, held by W. T. Alexander; routine meeting announcements for the Ponupo Mining & Transportation Co.