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Oro Rico Mine (Penon Blanco Mine), Peñon Blanco Peak, Coulterville, Coulterville District, Mother Lode Belt, Mariposa Co., California, USA

Latitude: 37°44'50"N
Longitude: 120°14'10"W
A Au-Cu-Pb-Zn occurrence/group of claims/mine located in secs. 19, 20 & 29, T2S, R16E, MDM, 2.8 km (9,200 feet) NE of Peño Blanco Peak (coordinates of record) (on the E slope of Penon Blanco Point, just S of the Tuolumne County line along highway 49). Property consisted of 5 patented claims and 2 unpatented claims, totaling over 100 acres. Operated by Oro Rico Mines Co. C/O A. D. Vencile. MRDS database stated accuracy for this location is 500 meters. Location may be the prospects shown in the NE¼ of sec. 19, SW¼ sec. 20, and in the NW¼ sec. 29, USGS quadrangle Coulterville, California (1949).

Claims includes: Old Judge, South Judge, Little Judge, Penon Blanco and North Penon Blanco (patented); and the Star and Stevenson claims (unpatented).

Local rocks include ultramafic rocks, chiefly Mesozoic, unit 2 (Western Sierra Nevada and Klamath Mountains).

Workings include underground openings comprised of adits, shafts, tunnels and drifting. Inn 1954, 2 workigns were still recognizable on the Penon Blanco claim, but none was accessible without some cleaning out.

One of the earliest worked claims in the county. Considerable development had been made by 1868 and several ore shoots 2-4 feet thick had been discovered and ore averaged $10 - $12 per ton (period values). Worked intermittently until 1912. Little or no work done until after 1928 due to litigation. Some exploration and development done in 1934. Little or no work done since.

Total production, although incompletely recorded, is small. Copper production was less than 100,000 pounds (Eric, J.C. (1948)).

Mineral List

Albite
Altaite
Chalcopyrite
'Chlorite Group'
Dolomite
var: Ferroan Dolomite

Galena
Gersdorffite
Gold
Graphite
Hessite
Magnesite
Melonite
Millerite
Muscovite
var: Sericite

Petzite
'Phengite
var: Mariposite'

Pyrite
Pyrrhotite
Quartz
Rutile
'Serpentine Group'
Skutterudite
Sphalerite
Talc
Tetrahedrite


25 entries listed. 20 valid minerals.

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References

Logan, Clarence August (1934), Mother Lode Gold Belt of California: California Division Mines Bulletin 108, 221 pp.: 185-186.

Eric, J.C. (1948), Copper in California: California Division of Mines Bulletin 144: part 3: 269.

Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology (Report 53): 53(1&2): 147-148, 294.

Goodwin, Joseph Grant (1957) Lead and zinc in California. California Journal of Mines and Geology, Division of Mines (Report 53): 53(3&4): 551.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10030836 & 10284930.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060430040.

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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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