Latitude & Longitude (WGS84):
35° 22' 20'' North , 115° 28' 34'' West
Latitude & Longitude (decimal):
Long-form identifier:
mindat:1:2:87951:9
A former Cu-Au-Ag occurrence/mine located in the NW¼SE¼NW¼ sec. 22 & in sec. 27, T15N, R14E, SBM, about 6.0 km SSE of Kokoweef Peak (summit) (8½ miles NE of Mountain Pass). MRDS database stated accuracy for this location is 10 meters.
Mineralization is a vein deposit hosted in limestone, quartzite and granitic gneiss. The ore body strikes N and dips 70E. The Hillside claim is in an oxidized, pulverized fault zone with quartzite and limestone on the E and sheared granitic gneiss on the W. The oxide workings are in a Cu-stained gouge zone between granitic rock on the E and limestone on the W. On the Cuprite claim, an Fe-silica-bearing zone forms a bold outcrop on a granite-limestone contact. Copper occurs in both the sulfide and carbonate forms. Associated rocks include Late Cretaceous - Late Permian monzonite. Local rocks include Mesozoic granitic rocks, unit 3 (Sierra Nevada, Death Valley area, Northern Mojave Desert and Transverse Ranges) and/or Cambrian marine rocks.
Workings include underground openings with an overall depth of 41.15 meters. There are 3 groups of workings on the Hillside claim: 1) a 20 foot tunnel and a 25 foot winze that opens into an E-W stope 40 by 15 by 20 feet; 2) ½ mile W, the oxide workings with a main shaft 135 feet deep, inclined 55W with several 40 to 50 foot drifts totaling 200 feet, and a 30 foot vertical shaft. There are several shallow shafts and a short tunnel on the Cuprite claim.
Production data are found in: Wright, L.A., et al (1953).
Several hundred tons of Ag-Au-Cu ore were obtained during the period 1925 to 1940. A small additional tonnage of ore was shipped during 1947 and 1949.
Analytical data results: 8 to 20% Cu.
Select Mineral List Type
Standard
Detailed Gallery
Strunz
Chemical Elements
Commodity List
This is a list of exploitable or exploited mineral commodities recorded at this locality.Mineral List
2 valid minerals.
Rock Types Recorded
Note: data is currently VERY limited. Please bear with us while we work towards adding this information!
Select Rock List Type
Alphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
Gallery:
List of minerals arranged by Strunz 10th Edition classification
| Group 2 - Sulphides and Sulfosalts |
|---|
| ⓘ | Chalcopyrite | 2.CB.10a | CuFeS2 |
| Group 4 - Oxides and Hydroxides |
|---|
| ⓘ | Quartz | 4.DA.05 | SiO2 |
List of minerals for each chemical element
Other Databases
Other Regions, Features and Areas containing this locality
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
Mindat.org® is an outreach project of the
Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are
© OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by
Jolyon Ralph and Ida Chau.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844.
doi:10.2138/am-2024-9486.
Privacy Policy -
Terms & Conditions -
Contact Us / DMCA issues -
Report a bug/vulnerability
Current server date and time: April 4, 2026 10:10:00
Page updated: August 23, 2025 14:36:58
