This folder contains correspondence and other documents relating to mining and ore milling. Included are items pertaining to mining property in Canada and mining equipment in Australia, as well as correspondence enclosing ore samples or inquiring about Edison's interest in ore milling, mines, and ores. Other documents deal with prospecting work paid for by Edison and the progress of litigation against the Allis-Chalmers Co., which Edison was suing for infringement of his crushing roll patent. One letter concerns the plant at Dunderland, Norway, constructed by the Edison Ore Milling Syndicate, Ltd.

Approximately 20 percent of the documents have been selected. The items not selected consist primarily of letters of transmittal and unsolicited inquiries, some of which contain perfunctory Edison marginalia indicating the desirability or the value of ores.