The Cactus Plain and East Cactus Plain (AZ-050-017) Wilderness Study Areas are in west-central Arizona, about 4 mi southeast of Parker, Arizona. At the request of the U.S. Bureau of Land Management, a mineral survey of approximately 79,065 acres was conducted by the U.S. Geological Survey and U.S. Bureau of Mines to appraise their identified mineral resources (known) and to assess their mineral resource potential (undiscovered). In this report, "study area .. refers collectively to both wilderness study areas for which a mineral survey was requested by the U.S. Bureau of Land Management.The southeastern corner of the Cactus Plain Wilderness Study Area is within the northern part of the Plomosa mining district (Northern Plomosa and Bouse mineral districts). The northeastern corner of the East Cactus Plain Wilderness Study Area is in the Midway mining district. The Cienega and Santa Maria mining districts are within 8 mi and lie north of the study area. Gold, silver, copper, and minor amounts of lead, zinc, manganese, barite, and fluorite have been produced from these districts, though no production is reported from mines located within the study area. There are no identified metallic resources in the study area.