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Irma and Weldon prospect, Drytown, Jackson-Plymouth District, Mother Lode Belt, Amador Co., California, USA

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Latitude & Longitude (WGS84): 38° 26' 49'' North , 120° 51' 47'' West
Latitude & Longitude (decimal): 38.44694,-120.86306
Köppen climate type:Csa : Hot-summer Mediterranean climate


A lode Au occurrence/prospect located in sec. 22, T7N, R10E, MDM, 1.0 km (0.6 mile) NW of Drytown, on the W side of highway 49, on private land. Operated by the B. I. Hoxie estate. MRDS database stated accuracy for this location is 1,000 meters.

Mineralization is a quartz vein deposit hosted in granodiorite. The vein contains 10% sulfides. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Workings include underground openings with an overall depth of 58.83 meters and comprised of a 193 foot shaft.


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

Late Jurassic - Triassic
145 - 252.17 Ma



ID: 2945286
Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains)

Age: Mesozoic (145 - 252.17 Ma)

Stratigraphic Name: Agua Fria Formation; Colfax Formation; Cosumnes Formation; Galice Formation; Hunter Valley Cherts; Mariposa Formation; Merced Falls Slate; Salt Spring Slate; Jasper Point Formation

Description: Shale, sandstone, minor conglomerate, chert, slate, limestone; minor pyroclastic rocks

Comments: Western Klamath Mountains, western Sierra Nevada. Primarily slate and metamorphosed graywacke; minor siltstone, conglomerate, chert, and volcanic rocks. Mainly Late Jurassic in age, but also includes some Early Jurassic or older rocks

Lithology: Major:{slate,graywacke}, Minor:{siltstone,conglomerate}, Incidental:{chert, volcanic, 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]

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)
Tucker, W. Burling (1914), Amador County: California Journal of Mines and Geology, California Mines Bureau (Report 14): 14: 20.
Logan, Clarence August (1927), Amador County, California Mining Bureau. (Report 23): 23: 191.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10028158 & 10211599.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060050174.

 
Mineral and/or Locality  
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