This folder contains correspondence and other documents relating to the technical and commercial development of Edison's technologies for ore concentration. Among the items for 1916 is a letter inquiring about the status of the long-defunct Edison Ore Milling Co., Ltd., along with a response by Edison that the company "is out of existence, the patents upon which it was based were not sustained in the Courts." Also included is a letter from W. Dallas Ross, a journalist and investor in the Edison Ore Milling Syndicate, Ltd., along with letters pertaining to former Edison employee James B. Ballantine.

Approximately 40 percent of the documents have been selected. The unselected items consist primarily of inquiries about ore milling in general, which did not receive a substantive reply, and material not related to Edison.