Between 1987 and 1988, the U.S. Bureau of Mines studied the mineral resources of the White River National Forest and part of the Arapaho National Forest to appraise the resources present and to determine the types of deposits, and their location, that could be mined economically if sufficient demand and metal prices existed. The study included a comprehensive literature search and a limited amount of field investigation of minerals and mining activity in and near the forests. Mineral resource information indicates that in the gore range the area between Tennessee pass and gilman may contain large base- and precious-metal deposits and could be the focus of exploration activity in the near future. The Breckenridge Mining District was found to have a moderate to high likelihood for mineral exploration and possible development of gold. Recent exploration and minor development work has occurred in several other areas: Montezuma, Kokomo-Tenmile, and Upper Blue River Districts, and portions of the Sawatch Range. Limestone, marble, sand and gravel, rock for crushed aggregate, and other industrial rocks have been recently mined or quarried in the forest and will likely be mined or quarried in the near future. Currently coal is being produced at one mine in the forest, and extensive identified coal resources are located in the forest. Parts of four known gasfields lie within the forest west of Glenwood Springs; there is current production at one field.