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Summit lode, Mountain Spring, Argus District (Kellcy District; Sherman District), Argus Mts (Argus Range), Inyo Co., California, USA

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A Au-Ag-Mn-Fe-Pb-Cu occurrence located in sec. 18, T23S, R42E, MDM, 7.4 km (4.6 miles) E of Mountain Spring (approximately 1.5 miles NW of Birchum Springs; approximately 5 miles due E of the intersection of Mountain Springs Canyon, Junction Ranch, and Birchum Spring Roads, on military reservation land (China Lake Naval Ordnance Test Station). MRDS database accuracy for this location is not stated. Difficult to find, trail to prospect pit not visible from the intersection of Mountain Springs Canyon, Birchum Springs and Junction Ranch Roads; approximately 1 mile E of the above mentoned intersection.

Mineralization is a vein deposit hosted in granite. The form of the ore body is not defined due to insufficient information. It strikes N25W and dips 60SW at a thickness of 0.41 meters. Controls for ore emplacement included a shear zone. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges).

Approximately 2 feet of the vein is visible in the pit. It appears as if it should pinch & swell since it is within a shear zone; it couldm, however, pinch out.

The pit is a small feature and sits on a ridge with no signs of mineralization on either side. The Summit Lode prospect pit (not a shaft as reflected on the topo map) was found as described above. A quartz vein 16 inches (40 cm) wide was found within a shear zone in decomposed granite. The vein contained specular hematite. Epidote is a filling along cracks. Galena (?) and minor amounts of chrysocolla and Mn-dendrites are present. The workings are located along the edge of a ridge. There are no visible signs of the vein along either the N or S edges of this ridge. This implies a deposit of limited size, possibly 30 to 40 feet along strike.

Workings include surface openings comprised of a prospect pit with an overall depth of 1.52 meters, overall length of 6.1 meters, and an overall width of 2.44 meters (10 feet x 8 feet x 5 feet). There is a prospect "scratching" immediately to the S of the pit (3 x 5 x 1 foot deep).
Comments on the workings information

Mineral List



5 entries listed. 3 valid minerals.

The above list 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

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10036262.

Field observations by unstated party(ies) on an undisclosed date.

 
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