|Latitude & Longitude (WGS84):||40° 9' 41'' North , 113° 48' 24'' West|
|Latitude & Longitude (decimal):||40.16139,-113.80667|
|Köppen climate type:||BWk : Cold desert climate|
A former As-Cu-Au-Pb-Ag-Zn-W-Ba (baryte) mine located in sec. 6, T8S, R17W, SLM, (6800 feet, S78E of Gold Hill Town Road intersection), about 30 miles SW of Wendover, Utah, on private (patented) land within a Bureau of Land Management administered area. Owned by ASARCO (American Smelting and Refining Co.) (100.00%), Utah (1976). MRDS database stated accuracy for this location is 100 meters. Property closed in January 1945. The ore bodies are exhausted.
This mine is famous for an assemblage of secondary minerals of copper and other metals.
Mineralisation is Late Jurassic in age and is hosted in Ochre Mountain Limestone; Manning Canyon Formation (Dark quartzite, black shale). The ore body (first ?) is pad (pod ?)/lenticular in form, strikes N45W and dips 67E. The depth-to-bottom is 274.32 meters and the length is 91.44 meters. The ore body (second ?) strikes N40W and dips 45E at a thickness of 1 meter, depth-to-top of 100 meters, a width of 214 meters, and a length of 100 meters. The ore bodies are 1.) tabular/replacement; and, 2.) fissure vein. The origin is hydrothermal. Primary ore control was lithology and secondary was faulting. Wallrock alteration is moderate [1.) carbonate silicification; 2.) carbonitization]. Controls for ore emplacement were easily replaceable Limestone beds; fissuring within a favourable limestone bed, but limited by the dyke and quartz monzonite wedges. The altered limestone contains white, bladed wollastonite, green-brown garnet, zoisite, and diopside. Granite occurring in small bodies is heavily faulted. Local alteration includes the oxidation of metallics. Associated rocks include Late Jurassic - Mississippian granodiorite & quartz monzonite porphyry dyke. Local rocks include Pennsylvanian and Permian sedimentary rocks in western Utah.
Geologic structures include:
Regional: quartz-monzonite stock surrounding the sedimentary rocks; Ochre Mountain thrust about 3 miles to the W.
Local: Limestone beds strike NW, dipping vertically to 45E. A bed of jasperoid occurs along the shale-limestone contact.
Workings include underground openings with an overall depth of 274.32 meters, overall length of 91.44 meters and an overall width of 60.96 meters. Workings are on 6 levels (150, 300, 400, 600, 700, and 760 feet). There are 2 main shafts with several other shafts between levels. Estimated workings are some 8,000 feet of development.
This mine had the largest As reserves in the U.S. (1924). The decrease in the price of As in 1925 resulted in a shutdown. As production occurred during the period 1919-1923.
Analytical data results: 2.98% Cu; 4.33 ounces/ton Ag (Au ??); 5.62% Pb; 7.98 ounces/ton Ag.
Mineral ListMineral list contains entries from the region specified including sub-localities
106 valid minerals. 2 (TL) - type locality of valid minerals.
Rock Types Recorded
Rock list contains entries from the region specified including sub-localities
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Quaternary - Miocene|
0 - 23.03 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (0 - 23.03 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Cisuralian - Pennsylvanian|
272.3 - 323.2 Ma
Age: Paleozoic (272.3 - 323.2 Ma)
Stratigraphic Name: Oquirrh Group
Description: Oquirrh Group (10,000+ feet thick) of Cedar Mountains and vicinity, is equivalent, in part to Arcturus Formation and Ely Limestone elsewhere
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.