East Henry Mountains Mining District, Garfield County, Utah, USAi

Regional Level Types
East Henry Mountains Mining District	Mining District
Garfield County	County
Utah	State
USA	Country

The East Henry Mountain (Trachyte, Butler Wash, Taylor Ridge) mining district is in the Henry Mountains U area of eastern Garfield County, about 25 mi south of Hanksville. The district encompasses three subdistricts, from north to south: Butler Wash–Crescent Creek, Cottonwood Wash–Trachyte, and Taylor Ridge. The East Henry Mountain district is a significant U-V producer from a series of small operations which suffered from their remote location (Chenoweth, 1980). Total district metal production at modern metal prices is estimated at $10 million. The most important mines are the Cottonwood Wash, Taylor Ridge, Trachyte Creek, and Woodruff mines.
The East Henry Mountain district is located on the east flank of the Henry Mountains on the Colorado Plateau. The ore is hosted in the Salt Wash Member of the Morrison Formation, which dips gently west into the Henry Mountains syncline (Chenoweth, 1980). The Cottonwood Wash-Trachyte ore occurs 100 to 150 ft above the base of the Salt Wash Member, at a higher stratigraphic horizon than at the Shootaring or Del Monte mines to the south, but it is still associated with a thick, favorable mudstone (USGS Model 30c). Paleo-streams meandered noticeably, but channels in the Salt Wash Member generally trend east-west (Doelling, 1974). Typical orebodies average 50 ft long by 20 ft wide by 2 ft thick and are associated with trash- pocket type accumulations of carbonaceous material. The ore minerals occur interstitially to sand grains (Doelling, 1974).
Uranium production from the East Henry Mountain district through 1978 is estimated at a modest 26,600 tons averaging 0.33% U3O8 and 1.48% V2O5 for a total of 175,560 pounds U3O8 and 787,380 pounds V2O5 (Chenoweth, 1980).