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

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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 entries listed. 2 valid minerals.

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References

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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