Carr Fork Mine, Bingham District (West Mountain District), Oquirrh Mts, Salt Lake Co., Utah, USA
|Latitude & Longitude (WGS84):||40° 31' 52'' North , 112° 11' 27'' West|
|Latitude & Longitude (decimal):||40.53133,-112.19108|
|Köppen climate type:||Cfa : Humid subtropical climate|
Alteration: Dolomitization, Diopsitization, Actinloitization, Biotitization, Silicification, Chloritization
Tectonics: Sevier Orogenic Belt, Basin And Range
Commodity: High-grade gold zone characterized by anomalous au, as, sb, hg, si, s, and tl and depleted pd, ca, and se.
Deposit: Sedimentary section exposed in carr fork area is about 2,150 ft thick; it includes 2 thick limestones in lower part of section separated and overlain by calcareous quartzite and thin silty limestone. Alteration in quartzite and silty limestone is characterized by replacement of calcite by diopside, which was later altered to quartz-actinolite-calcite resulting in alteration envelopes along fractures near bingham stock and orbicular textures farther away. Biotite replaced actinolite in envelopes near stock. Thicker limestones sho W a progressive alteration to calcite-wollastonite, andradite-calcite-wollastonite, andradite-wollastonite, and andradite-quartz. Chalcopyrite deposition was greatest in andradite-bearing rocks. Diopside-salite may have formned with andradite but its distribution and paragenesis are obscured by its susceptibility to clay alteration and leaching. Exposed seminentary rocks lie on limbs of an overturned anticline, the axial plane of which strikes nearly east and dips 50s. The trace of the axial plane is located immediately north of apex shaft and just north of carr fork mine exhause shaft. Rocks on south limb of anticline dip 20-30n and strike n60-80w; those on north limb dip 70-80n and strike n70-80w. Only a minor amount of normal faulting with apparent maximum offset of 20 ft is observied at surface. Best cu values are in marblized-silicated zones and pb-zn-cu ores are in transition from white to black limestone. The more intensely silicated limestone has become a massive or granular garnetite containing specular hematite, magnetite, chalcopyrite, pyrite. Consequently a telescoping order of mineralization may follo W a pattern such As cu-pb-zn, pb-cu-zn, pb-zn-cu, zn-pb-mn. Ag and Au are present in variable amounts throughout but increast in an outer environment. ; info.src : 1 pub lit; 2 unpub rept; 3 field observ record w002689 has been deleted. Deposit lies on west flank of oquirrh mountains along occidental fault. Ore is a skarn formed in two limestone units enclosed by quartzites. Evidence suggests two gold mineralizing episodes. Some geologists classify this deposit As a cu skarn or a gold-bearing skarn.
Development: Vcr (vertical crater retreat) mining is used to reduce blast damage throughout the mine and, at the same time, produce better fragmentation.
Geology: Limestone grades from dark gray to black through banded, gray, black, and white toward more intensely silicated zones at igneous contacts. Ore minerals are intimately associated with quartz veins in altered wall rocks.
Commodity ListThis is a list of exploitable or exploited mineral commodities recorded at this locality.
19 valid minerals.
Rock Types Recorded
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
0 - 2.588 Ma
|Older alluvial deposits|
Age: Pleistocene (0 - 2.588 Ma)
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. 
|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.