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Middlesex Mine, Goodsprings, Goodsprings District, Spring Mts, Clark Co., Nevada, USA

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Latitude & Longitude (WGS84): 35° 51' North , 115° 29' West
Latitude & Longitude (decimal): 35.85000,-115.48333
Köppen climate type:BWk : Cold desert climate


A former Cu-Pb-Ag-Zn mine located in secs. 20 & 21, T24S, R58E, MDM, 4.8 km (3.0 miles) WNW of Goodsprings and E of Shenandoah Peak (½ mile SE of the Yellow Pine Mine), on private land within a Bureau of Land Management administered area. MRDS database stated accuracy for this location is 10 meters.

Mineralization is a deposit hosted in dolomite. The ore body strikes NS (N-S ?) and dips 35W. Controls for ore emplacement included a bedding surface fracture. Galena in coarse cubic crystals embedded in white, coarse dolomite. A granite porphyry sill is 40 feet stratigraphically below the fracture. Associated rocks include Paleocene/Pennsylvanian granite. Local rocks include limestone and sparse dolomite, siltstone, and sandstone.

Regional geologic structures include large scale overthrusts.

Workings include underground openings comprised of 2 tunnels. The upper tunnel is 100 feet long and the lower is 400 feet long. Also, 3 other tunnels were driven within 600 feet from the mine, which explore the same ore zone.

Production data are found in: Hewett (1931).

No recorded production, but estimated at 200 tons of Pb/Zn ore.


Mineral List


2 valid minerals.

Regional Geology

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

Holocene - Pleistocene
0 - 2.588 Ma



ID: 2770762
Alluvium, undifferentiated

Age: Pleistocene (0 - 2.588 Ma)

Description: Unit is present in all counties. Some counties divided the alluvium into younger and older units, and some did not. For those that did not, or used other generalized terms for Quaternary rocks, the unit Qal has been used for the general undivided alluvium. Additionally, when polygons have been edited and changed to alluvium, Qal was used as the general value; hence it now is present in all counties. Qya-Younger alluvium: Map unit is used in Churchill, Elko, Esmeralda, Eureka, Humboldt, Lander, and Lincoln Counties where geologic information suggests better-defined younger versus older alluvium. It is mostly interchangeable with Qal, except that it implies some specifically younger Quaternary deposits.

Lithology: Major:{coarse alluvium,fine alluvium}

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. [133]

Quaternary - Miocene
0 - 23.03 Ma



ID: 3185380
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. [154]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Hewett (1931), Geology and Ore Deposits of Goodsprings Quadrangle, USGS Professional Paper 162: 137-138.
Rocks & Minerals (1936): 11: 243.
Longwell, C.R., et al (1965), Geology and Mineral Deposits of Clark County, Nevada, Nevada Bureau of Mines and Geology Bulletin 62: 192.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10037227 & 10270233.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060190109.

Mineral and/or Locality  
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