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O'Hara Mine (Franklin Mine), Sonora, Sonora District, East Belt, Tuolumne Co., California, USA

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Latitude & Longitude (WGS84): 37° 59' 34'' North , 120° 22' 48'' West
Latitude & Longitude (decimal): 37.99278,-120.38000
GeoHash:G#: 9qf2hsmgy
Locality type:Mine
Köppen climate type:Csa : Hot-summer Mediterranean climate


A former lode Au pocket mine located in sec. 25, T2N, R14E, MDM, 1.0 km (3,200 feet) N of Sonora, along Woods Creek, on private land. Holdings are of 27 acres. MRDS database stated accuracy for this location is 500 meters.

Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).

Workings include unspecified underground openings.


Mineral List


2 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

Triassic - Ordovician
201.3 - 485.4 Ma



ID: 2914721
Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada)

Age: Phanerozoic (201.3 - 485.4 Ma)

Stratigraphic Name: Calaveras Complex; Shoo Fly Complex; Blue Canyon Formation; Briceburg Formation; Cape Horn Slate; Delhi Formation; Hite Cove Formation; Kanaka Formation; Relief Quartzite; Tightner Formation

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

Comments: Western Sierra Nevada. Lower Paleozoic Shoo Fly Complex and upper Paleozoic to lower Mesozoic Calaveras Complex, undivided. Deformed and metamorphosed rocks composed primarily of quartzite, argillite, and chert; includes melange

Lithology: Major:{argillite,quartzite,phyllite}, Minor:{mudstone,sandstone,chert}, Incidental:{schist, marble, conglomerate, sedimentary breccia, limestone, basalt}

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]

Devonian - Silurian
358.9 - 443.8 Ma



ID: 3185269
Paleozoic sedimentary and volcanic rocks

Age: Paleozoic (358.9 - 443.8 Ma)

Comments: Mccloud Arc

Lithology: Mudstone-carbonate-sandstone-conglomerate

Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. [154]

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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sharwood, William J. (1911), Notes on tellurium-bearing gold ores: Economic Geology: 6: 22-36.
Logan, Clarence August (1949), Mines and mineral resources of Tuolumne County, California: California Journal of Mines and Geology (California Mines Bureau (Report 45): 45: 70.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 61.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10077915 & 10263262.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0061090291.

 
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