This folder contains correspondence, ore analysis reports, and other documents relating to mining and ore milling. Some of the documents pertain to the exhibition of ore milling machinery in the United States, France, and the United Kingdom. Other items deal with the hiring of John Birkinbine as Edison's mining consultant. Also included are responses to a newspaper advertisement taken out by W. Preston Hix, who was in charge of soliciting gold ore samples for experimentation.

Approximately 70 percent of the documents have been selected. The following categories of documents have not been selected: correspondence from John Birkinbine regarding a visit to the laboratory by members of the United States Association of Charcoal Iron Workers; meeting announcements of the Edison Ore Milling Co., Ltd.; routine correspondence regarding ore samples sent to Edison for assaying; letters offering to sell mining properties, minerals, and ores to Edison; routine correspondence in response to Hix's newspaper advertisement; bills of lading for ore samples; duplicate copies of selected documents.