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Rio Hondo Mine, Goldstone, Goldstone District, San Bernardino Co., California, USA

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Latitude & Longitude (WGS84): 35° 14' 13'' North , 116° 49' 26'' West
Latitude & Longitude (decimal): 35.23695,-116.82389
Köppen climate type:BWk : Cold desert climate


A former lode Au occurrence/mine located in sec. 12, T13N, R1E, SBM, 10.5 km (6.5 miles) SE of Goldstone (12.5 miles NE of Lane Mountain). The property is comprised of 6 claims. MRDS database stated accuracy for this location is 10 meters. Tucker and Sampson (1943) place this mine in sec. 33, T14N, R2E, SBM. The location was taken from Wright (1953) by the USGS MRDS database staff.

Mineralization is hosted in limestone and schist. The ore body strikes N50W and dips 80N at a thickness of 1.52 meters. Granitic rock intrudes metasediments at depth. Several small, discontinuous veins cut the complexly folded metasedimentary units. The main vein is several hundred feet long and 2 to 5 feet thick. The gold is partly free and partly in auriferous pyrite. Associated rocks include granite. Local rocks include Paleozoic marine rocks, undivided, unit 2 (Northern Mojave Desert and Southeastern Sierra Nevada).

Workings include surface and underground openings with an overall depth of 27.43 meters and comprised of 2 shafts at 72 and 90 feet deep, and 50 feet apart, plus an open cut and 2 short adits. Remnants of an amalgamation mill are present.

Analytical data results: Assays ranged from $7-$15 (period values) Au/ton.


Mineral List


3 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

Jurassic - Cambrian
145 - 541 Ma



ID: 2943787
Paleozoic marine rocks, undivided, unit 2 (Northern Mojave Desert and Southeastern Sierra Nevada)

Age: Phanerozoic (145 - 541 Ma)

Stratigraphic Name: Robbers Mountain Formation

Description: Undivided Paleozoic metasedimentary rocks. Includes slate, sandstone, shale, chert, conglomerate, limestone, dolomite, marble, phyllite, schist, hornfels, and quartzite

Comments: North-central Mojave Desert and southeastern Sierra Nevada. Argillite, chert, phyllite, sandstone, conglomerate, limestone, and quartzite. Includes some rocks of probable Triassic or Jurassic age

Lithology: Major:{argillite,chert,phyllite}, Minor:{sandstone,quartzite,hornfels}, Incidental:{conglomerate, limestone, marble, dolostone}

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]

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

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Tucker, W. Burling & Reid J. Sampson (1943b), Mineral resources of San Bernardino County: California Journal of Mines and Geology, California Division of Mines (Report 39): 39(4): 459.
Wright, L.A., et al (1953), Mines and mineral resources of San Bernardino County, California: California Journal of Mines and Geology, California Division of Mines (Report 49): 49(1-2): 79.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10035704 & 10262663.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060710174.

 
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