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Paloma Mining District, Mother Lode Belt, Calaveras Co., California, USAi
Regional Level Types
Paloma Mining DistrictMining District
Mother Lode BeltBelt
Calaveras Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
38° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~4km
Locality type:


This Au mining district lies on the Mother Lode between the San Andreas District to the S and the Plymouth-Jackson District (Amador County) to the N, around the town of Paloma.

The Paloma district is within the Sierra foothills in northwestern Calaveras County, where bedrock consists of north trending tectonostratigraphic belts of metamorphosed sedimentary, volcanic, and intrusive rocks that range in age from late Paleozoic to Mesozoic. The structural belts, which extend about 235 miles along the western side of the Sierra, are flanked to the east by the Sierra Nevada Batholith and to the west by sedimentary rocks of the Cretaceous and Jurassic Great Valley sequence. The structural belts are internally bounded by the Melones and Bear Mountains fault zones and are characterized by extensive faulting, shearing, and folding (Earhart, 1988).

Much of the gold produced in the district has come from the famous Gwin mine, which was operated on a large scale during the 1860's, 1870's, and from 1894 to 1908. The mine, named for U.S. Senator William Gwin, had a total output valued at about $7 million (period values). The gold-bearing veins are in the same belt of slate of the Mariposa Formation (Upper Jurassic) on which the large Jackson district mines lie, in Amador County to the North. The quartz veins strike NNW and dip steeply to the east. The ore contains free gold, pyrite, and arsenopyrite. Milling ore recovered from the Gwin mine averaged about 14 ounce gold per ton. The great north ore shoot in this mine had a horizontal stoping length of up to 800 feet and a pitch length of 1,50O feet.

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

Mineral list contains entries from the region specified including sub-localities

10 valid minerals.

Detailed Mineral List:

Albite
Formula: Na(AlSi3O8)
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59
Arsenopyrite
Formula: FeAsS
Description: Occurs as both large and small crystals. The large crystals enclose arborescent masses of crystallized gold.
Reference: ; Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59; Ransome, Frederick Leslie (1900), Description of the Mother Lode district, California: USGS Geol. Atlas, Mother Lode (No. 63), 11 pp.: 8; Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 86.; Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office
Calcite
Formula: CaCO3
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59
Chalcopyrite
Formula: CuFeS2
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59; Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office
Galena
Formula: PbS
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59
Gold
Formula: Au
Localities: Reported from at least 12 localities in this region.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59
Muscovite var: Sericite
Formula: KAl2(AlSi3O10)(OH)2
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59
Pyrite
Formula: FeS2
Reference: Clark, William B. & Lydon, Philip A., California division of mines and geolgy (1963) MINES AND MINERAL RESOURCES OF CALAVERAS COUNTY, CALIFORNIA, county report number 2, pages 56-59; Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office
Quartz
Formula: SiO2
Localities: Reported from at least 12 localities in this region.
Sphalerite
Formula: ZnS
Reference: Emmons and Becker (1885) Statistics and Technology of the precious Metals. Census reports Tenth census. June 1, 1880, Volume 13 By United States. Census office. 10th census, 1880, United States. Census Office

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Sphalerite2.CB.05aZnS
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Calcite5.AB.05CaCO3
Group 9 - Silicates
Albite9.FA.35Na(AlSi3O8)
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Sericite9.EC.15KAl2(AlSi3O10)(OH)2

List of minerals arranged by Dana 8th Edition classification

Group 1 - NATIVE ELEMENTS AND ALLOYS
Metals, other than the Platinum Group
Gold1.1.1.1Au
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Sphalerite2.8.2.1ZnS
AmBnXp, with (m+n):p = 1:1
Chalcopyrite2.9.1.1CuFeS2
AmBnXp, with (m+n):p = 1:2
Arsenopyrite2.12.4.1FeAsS
Pyrite2.12.1.1FeS2
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Group 76 - TECTOSILICATES Al-Si Framework
Al-Si Framework with Al-Si frameworks
Albite76.1.3.1Na(AlSi3O8)
Unclassified Minerals, Mixtures, etc.
Muscovite
var: Sericite
-KAl2(AlSi3O10)(OH)2

List of minerals for each chemical element

HHydrogen
H Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
CCarbon
C CalciteCaCO3
OOxygen
O QuartzSiO2
O AlbiteNa(AlSi3O8)
O Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
O CalciteCaCO3
O MuscoviteKAl2(AlSi3O10)(OH)2
NaSodium
Na AlbiteNa(AlSi3O8)
AlAluminium
Al AlbiteNa(AlSi3O8)
Al Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
SiSilicon
Si QuartzSiO2
Si AlbiteNa(AlSi3O8)
Si Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
SSulfur
S ArsenopyriteFeAsS
S PyriteFeS2
S ChalcopyriteCuFeS2
S GalenaPbS
S SphaleriteZnS
KPotassium
K Muscovite (var: Sericite)KAl2(AlSi3O10)(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
CaCalcium
Ca CalciteCaCO3
FeIron
Fe ArsenopyriteFeAsS
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
CuCopper
Cu ChalcopyriteCuFeS2
ZnZinc
Zn SphaleriteZnS
AsArsenic
As ArsenopyriteFeAsS
AuGold
Au GoldAu
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Turner, H. W. (1894), Jackson folio, California: USGS Geologic Atlas of the U.S., folio No. 11, 6 pp.
Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933: 312-313, 1934]: 56-59.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 104.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10310625.

Other Databases

USGS MRDS Record:10310625

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