This folder contains correspondence and other documents regarding Edison's dry placer process for the separation of gold ore. Included are items pertaining to orders of equipment and supplies as well as letters between Cloyd M. Chapman, Edison's mining engineer, and mine owners.

Less than 10 percent of the documents have been selected. Selected items include representative samples of the letters received from mine owners and the responses made; printed descriptions of the dry placer process; and a letter from Chapman to Edison. Price estimates for equipment and other correspondence regarding orders have not been selected.