Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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Francis Mine (Cuyamaca lode; Cuyamaca mill site; Fanny #1-3; Monte Video; Western Star; Woods; Amos; Ramona), Columbia Mountain, Kelso District, San Bernardino County, California, USAi
Regional Level Types
Francis Mine (Cuyamaca lode; Cuyamaca mill site; Fanny #1-3; Monte Video; Western Star; Woods; Amos; Ramona)Mine
Columbia MountainMountain
Kelso DistrictMining District
San Bernardino CountyCounty
CaliforniaState
USACountry

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Latitude & Longitude (WGS84):
35° 3' 56'' North , 115° 29' 2'' West
Latitude & Longitude (decimal):
35.06581,-115.48413
GRN:
N24W68
Type:
Mine
Köppen climate type:
BWk : Cold desert climate
Mindat Locality ID:
11228
Long-form identifier:
mindat:1:2:11228:3
GUID (UUID V4):
0


A former Cu-Pb-Zn occurrence/mine located in the S½NE¼ sec. 4, T11N, R14E, SBM, about 2.6 km SSW of Columbia Mountain (summit), S of Macedonia Canyon (4 miles SE of Ames), on Bureau of Land Management administered federal reservation land (Mojave National Preserve/East Mojave National Scenic Area). MRDS database stated accuracy for this location is 10 meters.

Mineralization is a vein deposit hosted in gneiss. The ore body strikes NE and dips 70NW at a thickness of 9.14 meters and a length of 762 meters. The deposit is a vein in quartz porphyry intrusive. Local rocks include Precambrian rocks, undivided, unit 2 (Mojave Desert and Transverse Ranges).

Workings include underground openings with a length of 265.18 meters and an overall depth of 42.67 meters and comprised of 2 shafts to depths of 70 and 140 feet with a connecting drift on the 70 foot level at 160 feet in length. Other drifts were driven on the 140 level, totaling 600 feet.

Production data are found in: Tucker, W. Burling & Reid J. Sampson (1943b).

Production statistics: Year: 1918 (ore) (accurate): ^1.7 to 2% Cu, 7.8 to 10.6 ounces Ag/ton. Recovery percentage Ag at 260 grams/ton & Cu at 2 weight percent. The ore contains 1 to 2% Pb and 3 to 10% Zn.

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Standard Detailed Gallery Strunz Chemical Elements

Mineral List


6 valid minerals.

Rock Types Recorded

Note: data is currently VERY limited. Please bear with us while we work towards adding this information!

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Alphabetical List Tree Diagram

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘSphalerite2.CB.05aZnS
ⓘChalcopyrite2.CB.10aCuFeS2
ⓘGalena2.CD.10PbS
Group 3 - Halides
ⓘChlorargyrite3.AA.15AgCl
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 7 - Sulphates, Chromates, Molybdates and Tungstates
ⓘScheelite7.GA.05Ca(WO4)

List of minerals for each chemical element

OOxygen
Oⓘ QuartzSiO2
Oⓘ ScheeliteCa(WO4)
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ ChalcopyriteCuFeS2
Sⓘ GalenaPbS
Sⓘ SphaleriteZnS
ClChlorine
Clⓘ ChlorargyriteAgCl
CaCalcium
Caⓘ ScheeliteCa(WO4)
FeIron
Feⓘ ChalcopyriteCuFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2
ZnZinc
Znⓘ SphaleriteZnS
AgSilver
Agⓘ ChlorargyriteAgCl
WTungsten
Wⓘ ScheeliteCa(WO4)
PbLead
Pbⓘ GalenaPbS

Other Databases

Link to USGS MRDS:10077220

Other Regions, Features and Areas containing this locality

North AmericaContinent
North America PlateTectonic Plate
USA

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

Dana, Edward Salisbury; Dana, James Dwight (1892) A System of Mineralogy (6th ed.). John Wiley & Sons, Inc.
Tucker, W. Burling (1918b), Francis Mine: unpubhlished field report, California State Mining Bureau, 3 pp.
Tucker, W. Burling (1921), Los Angeles field division: California Journal of Mines and Geology, California Mining Bureau. (Report 17): 17: 341.
Tucker, W. Burling & Reid J. Sampson (1930), Los Angeles field division: California Journal of Mines and Geology, California Mining Bureau. (Report 26): 26: 210-213.
Tucker, W. Burling & Reid J. Sampson (1931), Los Angeles Field Division; 27th Report of the State Mineralogist; San Bernardino County: California Journal of Mines and Geology, California Mining Bureau. (Report 27): 27: 271-272.
Jenkins, Olaf Pitt (1942), Tabulation of tungsten deposits of California to accompany Economic Minerals Map no. 4: California Division Mines (Report 38): 38 (3&4): 351.
Tucker, W. Burling, Reid J. Sampson (1943) Mineral resources of San Bernardino County. California Journal of Mines and Geology, 39 (4) 427-549p.434
Bramel, Hadley R., Heyl, George R., Cox, Manning W., Ransome, Alfred L., Eric, John H., Wyant, Donald G. (1948) Copper in California. Bulletin 144. California State Mining Bureau p.305
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): tabulated list, p. 9.
Hewett, Donnel Foster (1956) Geology and mineral resources of the Ivanpah quadrangle, California and Nevada, USGS Professional Paper 275, 172 pp.: 142
Moyle, P.R., and others (1986), Mineral Resources of the Providence Mountains Study Area, San Bernardino County, California: U.S. Bureau of Mines Open-File Report MLA 47-86, appendix B, No. 128: 271.
U.S. Bureau of Mines (1995), Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060710281.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
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