Trout Creek Mining District, Juab County, Utah, USAi

Regional Level Types
Trout Creek Mining District	Mining District
Juab County	County
Utah	State
USA	Country

The Trout Creek district lies on the southeast flank of the Deep Creek Range in western Juab County, about 110 mi due west of Nephi. The district is a minor Zn-Ag producer and most of its production occurred during World War II. The district produced 93 tons of Zn-Pb-Ag ore and the total W production was 7980 lbs WO3 (Hannigan, 1990). Total district metal production at modern metal prices is estimated at $41,000. Three mines have minor reported production from the district: Trout Creek (Zn- Ag-W-Pb), Gold Bond (Au), and Apex (W).
The Deep Creek Range is a major mountain range in the Basin and Range Province. The most important geological feature of the Trout Creek district is that Neoproterozoic metamorphic rocks of the Trout Creek sequence have been thrust over Middle Cambrian strata. These Neoproterozoic rocks have been intruded and domed by a series of alaskite sills (Nutt and others, 1990). The age of the alaskite is uncertain (radiometric ages range from 29.4 to 20.5 Ma), but an Oligocene age (~27 Ma) is inferred. The alaskite primarily occurs as sills and varies from coarse-grained pegmatite to aplite, is commonly foliated along its contacts, and is principally composed of quartz, potassium feldspar, muscovite, garnet, and locally biotite (Nutt and others, 1990).
Mineralization occurs as coarse greisen-like veins and carbonate replacement/skarn deposits surrounding the alaskite intrusive in the Neoproterozoic dolomite (Nutt and others, 1990). Mineralization consists of sphalerite, scheelite, quartz, muscovite, fluorite, pyrrhotite, and beryl. Geochemical sampling shows sporadic ore-grade W, Zn, and Be, and geochemically anomalous Au, Ag, Bi, Cd, Cu, F, Pb, Mo, and Sn (Thomson, 1973; Hannigan, 1990; Nutt and others, 1990).