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Whitlock Mining District, Bagby-Mariposa-Mount Bullion-Whitlock Mining District, Mother Lode Belt, Mariposa Co., California, USAi
Regional Level Types
Whitlock Mining DistrictMining District
Bagby-Mariposa-Mount Bullion-Whitlock Mining DistrictMining District
Mother Lode BeltBelt
Mariposa Co.County
CaliforniaState
USACountry

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Key
Latitude & Longitude (WGS84):
37° North , 120° West (est.)
Estimate based on other nearby localities or region boundaries.
Margin of Error:
~6km
Locality type:


The Whitlock district is in west-central Mariposa County five miles north of the town of Mariposa. The district is east of the Mother Lode gold belt and includes the Colorado, Sherlock Creek, and Whiskey Flat areas. The area was placer-mined soon after the beginning of the gold rush, and lode mining began shortly afterward. A number of mines were active here during the 1930s, and a few, such as the Diltz and Schroeder mines, have been intermittently prospected in recent years.

Geology: Greenstone and green schist underlie much of the district, with some slate, phyllite, and mica schist in the north portion. Granitic intrusives and serpentine are to the south. There is an appreciable number of diorite, quartz-diorite, and aplite dikes that commonly are associated with the gold-quartz veins. A northwest-trending fault extends along the west side of the district (see fig. 18).

Ore Deposits: Numerous north- and northwest-striking quartz veins contain small but rich ore shoots. The veins usually are one to five feet thick, and a number dip at low angles. The veins have a tendency to roll or bend, and it is in these bends or rolls that the high-grade pockets often occur. Much specimen ore has been produced in the district; in 1932 the Diltz mine yielded 52- and 40-pound masses of gold and quartz. The greatest depth of development is about 900 feet.

Mines: Buffalo, Champion, Colorado ($50,000), Diltz ($750,000 to $1 million), Geary, Golden Key ($154,000+), King Solomon, Landrum, Nutmeg ($180,000+), Our Chance, Permit, Schroeder ($200,000 to $300,000), Spread Eagle $425,000, Whitlock $500,000.

Regions containing this locality

Pacific OceanOcean
North America PlateTectonic Plate

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List

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

15 valid minerals.

Detailed Mineral List:

Ankerite
Formula: Ca(Fe2+,Mg)(CO3)2
Reference: Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Arsenopyrite
Formula: FeAsS
Calcite
Formula: CaCO3
Localities:
Chalcopyrite
Formula: CuFeS2
Localities:
'Chlorite Group'
'Clays'
Reference: Rocks & Minerals 83:5 pp 392-401
Galena
Formula: PbS
Localities: Reported from at least 6 localities in this region.
Galena var: Argentiferous Galena
Formula: PbS
Description: Locally prominent.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10031155.
Gold
Formula: Au
Localities: Reported from at least 49 localities in this region.
Graphite
Formula: C
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10031114.
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
'Mariposite'
Formula: K(Al,Cr)2(Al,Si)4O10(OH)2
Description: Comprised the footwall of the deposit.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034712.
Muscovite
Formula: KAl2(AlSi3O10)(OH)2
Description: Comprised the footwall of the deposit.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034712.
Muscovite var: Phengite
Formula: KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Description: Comprised the footwall of the deposit.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034712.
Platinum
Formula: Pt
Description: Placer material.
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10236802.
Pyrite
Formula: FeS2
Localities: Reported from at least 7 localities in this region.
Pyrrhotite
Formula: Fe7S8
Quartz
Formula: SiO2
Localities: Reported from at least 32 localities in this region.
Quartz var: Milky Quartz
Formula: SiO2
Silver
Formula: Ag
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
Talc
Formula: Mg3Si4O10(OH)2
Tetrahedrite
Formula: Cu6Cu4(Fe2+,Zn)2Sb4S12S
Reference: USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10102896.
'Wad'

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Graphite1.CB.05aC
Platinum1.AF.10Pt
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Chalcopyrite2.CB.10aCuFeS2
Galena2.CD.10PbS
var: Argentiferous Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Tetrahedrite2.GB.05Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
var: Milky Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Calcite5.AB.05CaCO3
Group 9 - Silicates
Muscovite9.EC.15KAl2(AlSi3O10)(OH)2
var: Phengite9.EC.15KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Talc9.EC.05Mg3Si4O10(OH)2
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Clays'-
'Limonite'-(Fe,O,OH,H2O)
'Mariposite'-K(Al,Cr)2(Al,Si)4O10(OH)2
'Wad'-

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
Silver1.1.1.2Ag
Platinum Group Metals and Alloys
Platinum1.2.1.1Pt
Semi-metals and non-metals
Graphite1.3.6.2C
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
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 3 - SULFOSALTS
3 <ø < 4
Tetrahedrite3.3.6.1Cu6Cu4(Fe2+,Zn)2Sb4S12S
Group 14 - ANHYDROUS NORMAL CARBONATES
A(XO3)
Calcite14.1.1.1CaCO3
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)2
Group 71 - PHYLLOSILICATES Sheets of Six-Membered Rings
Sheets of 6-membered rings with 2:1 layers
Muscovite71.2.2a.1KAl2(AlSi3O10)(OH)2
Talc71.2.1.3Mg3Si4O10(OH)2
Group 75 - TECTOSILICATES Si Tetrahedral Frameworks
Si Tetrahedral Frameworks - SiO2 with [4] coordinated Si
Quartz75.1.3.1SiO2
Unclassified Minerals, Mixtures, etc.
'Chlorite Group'-
'Clays'-
Galena
var: Argentiferous Galena
-PbS
'Limonite'-(Fe,O,OH,H2O)
'Mariposite'-K(Al,Cr)2(Al,Si)4O10(OH)2
Muscovite
var: Phengite
-KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
Quartz
var: Milky Quartz
-SiO2
'Wad'-

List of minerals for each chemical element

HHydrogen
H TalcMg3Si4O10(OH)2
H Limonite(Fe,O,OH,H2O)
H MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
H MuscoviteKAl2(AlSi3O10)(OH)2
H Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
CCarbon
C CalciteCaCO3
C AnkeriteCa(Fe2+,Mg)(CO3)2
C GraphiteC
OOxygen
O QuartzSiO2
O TalcMg3Si4O10(OH)2
O CalciteCaCO3
O AnkeriteCa(Fe2+,Mg)(CO3)2
O Limonite(Fe,O,OH,H2O)
O Quartz (var: Milky Quartz)SiO2
O MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
O MuscoviteKAl2(AlSi3O10)(OH)2
O Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
MgMagnesium
Mg TalcMg3Si4O10(OH)2
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
Mg Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
AlAluminium
Al MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Al MuscoviteKAl2(AlSi3O10)(OH)2
Al Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
SiSilicon
Si QuartzSiO2
Si TalcMg3Si4O10(OH)2
Si Quartz (var: Milky Quartz)SiO2
Si MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
Si MuscoviteKAl2(AlSi3O10)(OH)2
Si Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
SSulfur
S PyriteFeS2
S ChalcopyriteCuFeS2
S GalenaPbS
S ArsenopyriteFeAsS
S PyrrhotiteFe7S8
S TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
S Galena (var: Argentiferous Galena)PbS
KPotassium
K MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
K MuscoviteKAl2(AlSi3O10)(OH)2
K Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
CaCalcium
Ca CalciteCaCO3
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
CrChromium
Cr MaripositeK(Al,Cr)2(Al,Si)4O10(OH)2
FeIron
Fe PyriteFeS2
Fe ChalcopyriteCuFeS2
Fe ArsenopyriteFeAsS
Fe PyrrhotiteFe7S8
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe Limonite(Fe,O,OH,H2O)
Fe TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
Fe Muscovite (var: Phengite)KAl1.5(Mg,Fe)0.5(Al0.5Si3.5O10)(OH)2
CuCopper
Cu ChalcopyriteCuFeS2
Cu TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
ZnZinc
Zn TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
AsArsenic
As ArsenopyriteFeAsS
AgSilver
Ag SilverAg
SbAntimony
Sb TetrahedriteCu6Cu4(Fe2+,Zn)2Sb4S12S
PtPlatinum
Pt PlatinumPt
AuGold
Au GoldAu
PbLead
Pb GalenaPbS
Pb Galena (var: Argentiferous Galena)PbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Ransome, Frederick Leslie (1900), Description of the Mother Lode district, California: USGS Geological Atlas, Mother Lode (folio No. 63), 11 pp.
Lowell, F. L. (1916), Mariposa County, Colorado, Diltz, and Whitlock mines, California Mining Bureau (Report 14): 14: 579, 581, & 599-600.
Castello, W.O. (1921), Mariposa County: Colorado district — Colorodo, Diltz, Schroeder, and Whitlock mines: California Mining Bureau. Report 17: 93, 111, 113, 137 & 142.
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): 69-187.
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193: 131.

Localities in this Region


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