This folder contains correspondence and other documents relating to mining and ore milling. Included are documents regarding the business of the Edison Iron Ore Concentrating Co., Edison's interest in the Ortiz gold mine in New Mexico, operations at the Ogden mine, and foreign ore milling matters. There is also one letter concerning a proposed visit by Edison to various Portland cement plants in Pennsylvania. Many of the documents have extensive Edison marginalia.
All of the documents have been selected. Courtesy of Thomas Edison National Historical Park.