Deep Mines Operation, a mining company owned by Newmont Mining Corporation, was established in Goldfield, Nevada in the 1940s. The collection contains purchase orders, assays, employee withholding statements, a mechanical brochure, and accident reports and mine safety meeting minutes from 1947-1950.

The Gray Eagle Copper Company, a copper mining company in Nevada’s Goldfield District, was owned by Newmont Mining Corporation. The collection contains the 1946 employment record for one employee, Oscar J. Berscheid.