This folder contains correspondence and other documents relating to mining and ore milling. Among the documents for 1909 are items pertaining to mining property in Canada and mining equipment in Australia. There are also letters enclosing ore samples or inquiring about Edison's interest in ore milling, mines, and ores. One memorandum concerns shares in the Edison Ore Milling Syndicate, Ltd., and the Dunderland Iron Ore Co., Ltd.

Approximately 50 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.