This folder contains correspondence and other documents relating to Edison's dry placer process for the extraction of gold ore. Most of the items are letters to Edison from his brother-in-law, John V. Miller, and from Cloyd M. Chapman, who went to the Ortiz Mine in Dolores, New Mexico, to prospect and to supervise the construction of an experimental ore processing mill. An undated report, probably from late December, gives an overview of activities at the Ortiz Mine during 1900.

Approximately 60 percent of the documents have been selected. Most of the documents not selected are ore assay tables, unsolicited inquires regarding the dry placer process, or brief agreements made between the Galisteo Co., which constructed the mill, and the men hired to sink mine shafts.