This folder contains correspondence and other documents relating to nickel- and cobalt-bearing properties in the Sudbury district of Ontario. The documents concern mining properties, including options on the Darby Mine; the transmittal of ore samples; and the purchase of ores. Most of the letters are by Horace M. Wilson, mining scout and manager of the Darby Mine. Also included is correspondence from the Toronto law firm of Denton, Dunn & Boultbee, along with a few items by John V. Miller and Walter S. Mallory.

Approximately 30 percent of the documents have been selected. The unselected material includes additional letters, news clippings, and pamphlets from Wilson; and letters of reference or inquiry.