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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.

The above list contains all mineral locality references listed on 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 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.


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.

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