A mineral-resource survey of the Gros Ventre Wilderness study area in the Gros Ventre Mountains of northwestern Wyoming was carried out. The area was found to have demonstrated phosphate resources in areas of substantiated phosphate resource potential. A probable oil and gas resource potential in the southwestern part of the study area was also identified. Oil and gas may occur in various possible reservoir rocks beneath the Cache Creek thrust fault, which is believed to extend beneath this part of the study area. There is little promise for the occurrence of other mineral or energy resources in the area.