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Slate Mountain Mine, Slate Mountain, Slate Mountain District, Slate Mts, El Dorado Co., California, USA

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Latitude & Longitude (WGS84): 38° 50' 46'' North , 120° 43' 26'' West
Latitude & Longitude (decimal): 38.84611,-120.72389
GeoHash:G#: 9qfhuzewc
Locality type:Mine
Köppen climate type:Csa : Hot-summer Mediterranean climate


A former lode Au occurrence/mine located in the SE¼NW¼ sec. 35, T12N, R11E, MDM, 4.3 km (2.6 miles) NW of Slate Mountain, on the W slope of the Slate Mountains, and 4.5 km (2.8 miles) SSE of Georgetown, on either private or National Forest land. Operated by E. W. Little. Operated intermittently during the period 1921 to 1941 and in 1951. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a vein deposit. The ore body is 2.44 meters thick. The vein varies from 1½ to 8 feet thick. Local rocks include Paleozoic marine rocks, undivided, unit 4 (Western Sierra Nevada).

Workings include underground openings comprised of a 600 foot crosscut adit and 2,400 feet of drifts. A 10-stamp mill was erected on the property.

A small amount of Au was produced in 1951.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


7 valid minerals.

Detailed Mineral List:

Cacoxenite
Formula: Fe3+24AlO6(PO4)17(OH)12 · 75H2O
Description: Occurs as micro-balls and radiating spheres perched on wavellite.
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 313; www.mineralsocal.org
Crandallite
Formula: CaAl3(PO4)(PO3OH)(OH)6
Colour: Light buff to white
Description: Sugary.
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304; www.mineralsocal.org
Quartz
Formula: SiO2
Reference: Rock Currier
Quartz var: Smoky Quartz
Formula: SiO2
Reference: www.mineralsocal.org
Rutile
Formula: TiO2
Reference: Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304; www.mineralsocal.org
Strengite
Formula: FePO4 · 2H2O
Reference: www.mineralsocal.org
Variscite
Formula: AlPO4 · 2H2O
Habit: Tabular; bladed; blocky
Description: Transparent to milky.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 380; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 311; www.mineralsocal.org
Wavellite
Formula: Al3(PO4)2(OH,F)3 · 5H2O
Habit: Prismatic
Colour: Colourless; pale green (massive material)
Description: Occurs as veins and crusts in quartz in well-formed prismatic crystals and massive material.
Reference: Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 383; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 311, 313; www.mineralsocal.org

List of minerals arranged by Strunz 10th Edition classification

Group 4 - Oxides and Hydroxides
'Quartz'4.DA.05SiO2
var: Smoky Quartz4.DA.05SiO2
'Rutile'4.DB.05TiO2
Group 8 - Phosphates, Arsenates and Vanadates
'Cacoxenite'8.DC.40Fe3+24AlO6(PO4)17(OH)12 · 75H2O
'Crandallite'8.BL.10CaAl3(PO4)(PO3OH)(OH)6
Strengite8.CD.10FePO4 · 2H2O
Variscite8.CD.10AlPO4 · 2H2O
Wavellite8.DC.50Al3(PO4)2(OH,F)3 · 5H2O

List of minerals arranged by Dana 8th Edition classification

Group 4 - SIMPLE OXIDES
AX2
Rutile4.4.1.1TiO2
Group 40 - HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
(AB)5(XO4)2·xH2O
Strengite40.4.1.2FePO4 · 2H2O
Variscite40.4.1.1AlPO4 · 2H2O
Group 42 - HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
(AB)2(XO4)Zq·xH2O
Crandallite42.7.3.1CaAl3(PO4)(PO3OH)(OH)6
A3(XO4)2Zq·xH2O
Wavellite42.10.2.1Al3(PO4)2(OH,F)3 · 5H2O
Miscellaneous
Cacoxenite42.13.5.1Fe3+24AlO6(PO4)17(OH)12 · 75H2O
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Rocks, etc.
var: Smoky Quartz-SiO2

List of minerals for each chemical element

HHydrogen
H CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
H CrandalliteCaAl3(PO4)(PO3OH)(OH)6
H StrengiteFePO4 · 2H2O
H VarisciteAlPO4 · 2H2O
H WavelliteAl3(PO4)2(OH,F)3 · 5H2O
OOxygen
O CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
O CrandalliteCaAl3(PO4)(PO3OH)(OH)6
O QuartzSiO2
O RutileTiO2
O Quartz (var: Smoky Quartz)SiO2
O StrengiteFePO4 · 2H2O
O VarisciteAlPO4 · 2H2O
O WavelliteAl3(PO4)2(OH,F)3 · 5H2O
FFluorine
F WavelliteAl3(PO4)2(OH,F)3 · 5H2O
AlAluminium
Al CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
Al CrandalliteCaAl3(PO4)(PO3OH)(OH)6
Al VarisciteAlPO4 · 2H2O
Al WavelliteAl3(PO4)2(OH,F)3 · 5H2O
SiSilicon
Si QuartzSiO2
Si Quartz (var: Smoky Quartz)SiO2
PPhosphorus
P CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
P CrandalliteCaAl3(PO4)(PO3OH)(OH)6
P StrengiteFePO4 · 2H2O
P VarisciteAlPO4 · 2H2O
P WavelliteAl3(PO4)2(OH,F)3 · 5H2O
CaCalcium
Ca CrandalliteCaAl3(PO4)(PO3OH)(OH)6
TiTitanium
Ti RutileTiO2
FeIron
Fe CacoxeniteFe243+AlO6(PO4)17(OH)12 · 75H2O
Fe StrengiteFePO4 · 2H2O

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: 2902487
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 Original map source: Saucedo, G.J., Bedford, D.R., Raines, G.L., Miller, R.J., and Wentworth, C.M., 2000, GIS Data for the Geologic Map of California, California Department of Conservation, Division of Mines and Geology, CD-ROM 2000-07, scale 1:750,000.

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

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Clark, Wm. B. & D.W. Carlson (1956), Mines and mineral resources of El Dorado County, California: California Journal of Mines and Geology: 52(4): 532.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 380, 383.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 304, 311, 313.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10007146, 10030854 & 10163191.
U.S. Bureau of Mines, Minerals Availability System (MAS) file #0060170868.

External Links

www.mineralsocal.org


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