This folder contains correspondence and other documents relating to mining and ore milling. Included are numerous inquiries from mine operators regarding the application, buying, or leasing of Edison's ore processing equipment. Some of the letters are by John Birkinbine, a consulting engineer hired by Edison to evaluate mining properties and to advise him on related projects. Other letters pertain to business dealings between Walter S. Mallory and the Edison Ore Milling Co., Ltd.
Approximately 80 percent of the documents have been selected. The following categories of documents have not been selected: routine inquiries receiving no significant reply; duplicate copies of selected items. Courtesy of Thomas Edison National Historical Park.