SUPPORT US. If mindat.org is important to you, click here to donate to our Fall 2019 fundraiser!
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat ArticlesThe ElementsBooks & Magazines
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsUsersMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryMineral Photography

Colorado Mine (Colorado Quartz Mine; Colorado Quartz claim), Colorado, Colorado Mining District, Whitlock Mining District, Bagby-Mariposa-Mount Bullion-Whitlock Mining District, Mother Lode Belt, Mariposa Co., California, USAi
Regional Level Types
Colorado Mine (Colorado Quartz Mine; Colorado Quartz claim)Mine
Colorado- not defined -
Colorado Mining DistrictMining District
Whitlock Mining DistrictMining District
Bagby-Mariposa-Mount Bullion-Whitlock Mining DistrictMining District
Mother Lode BeltBelt
Mariposa Co.County
CaliforniaState
USACountry

This page kindly sponsored by Goldbay
Key
Latitude & Longitude (WGS84):
37° 33' 20'' North , 119° 58' 20'' West
Latitude & Longitude (decimal):
Locality type:
Nearest Settlements:
PlacePopulationDistance
Midpines1,204 (2011)4.7km
Mariposa2,173 (2017)7.9km
Bootjack960 (2011)12.6km
Bear Valley125 (2011)13.0km
Catheys Valley825 (2011)17.6km


A former Au-Ag mine located in the near center of the section in the SW¼ (estimated) sec. 27 (& 32 ?), T4S, R18E, MDM, 0.5 km (1,600 feet) SW of Colorado School, along Long Canyon Creek, on private and unpatented land. The property consisted of 1 fractional patented claim plus 2 unpatented claims. Produced 1915 to 1938. Operated by Corinne Kratzer, F. E. and P. W. Judkins, et al (timeframe = ?). Owned and operated by the Colorado Quartz Gold Mining Co. (1990). MRDS database stated accuracy for this location is 100 meters.

Mineralization is a fissure vein deposit with a vein 2 to 6 feet thick, hosted in Late Permian slate and metasedimentary rock. The ore body is a pinch & swell body striking N50W and dipping 70NE at a thickness of 1.83M to/or 2.13 meters thick. Sandy metasediments have been intruded by greenstone dikes and sills 1-3 feet thick. The vein averages 1.5 to 2 feet thick, chiefly banded quartz. The ore shoots are 30 to 75 feet wide and pitch about 45 degrees. Strike and dip of slaty cleavage near the shaft is roughly parallel to the vein and to the bedding planes. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains) and/or Mesozoic volcanic rocks, unit 2 (Western Sierra Foothills and Western Klamath Mountains).

Workings include underground openings, which, in 1915, consisted of a 500 foot adit level, 140 foot raise to surface, another 65 foot raise and a 13 foot winze. Mention is also made of a 200 foot inclined shaft, a 300 foot long stope, and a 200 foot drift.

Nothing is recorded of early production. About 2,500 tons of ore were mined in the late 1920's which ran $10 to $11 per ton with some development rock running $8/ton (period values). Total production probably does not exceed $50,000 (period values).

Select Mineral List Type

Standard Detailed Strunz Dana Chemical Elements

Mineral List


9 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
Reference: Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Calcite
Formula: CaCO3
Reference: Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
'Chlorite Group'
Reference: Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Galena
Formula: PbS
Reference: Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Gold
Formula: Au
Habit: skeletal octahedral crystals, leaves
Colour: golden
Description: Crystallized with crystals to ¼ inch (0.62 cm).
Reference: Eidahl, D. (1977): Gold from the Colorado quartz mine. Mineralogical Record 8, 440-441; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 23; Economic Geology (1987): 82: 328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
'Limonite'
Formula: (Fe,O,OH,H2O)
Reference: Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Pyrite
Formula: FeS2
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.; Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Pyrrhotite
Formula: Fe7S8
Reference: Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Quartz
Formula: SiO2
Reference: [www.johnbetts-fineminerals.com]; Econ Geol (1987) 82:328-344; Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412
Silver
Formula: Ag
Reference: U.S. Geological Survey, 2005, Mineral Resources Data System: U.S. Geological Survey, Reston, Virginia.
'Wad'
Reference: Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California. Rocks & Minerals 84:396-412

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
Gold1.AA.05Au
Silver1.AA.05Ag
Group 2 - Sulphides and Sulfosalts
Arsenopyrite2.EB.20FeAsS
Galena2.CD.10PbS
Pyrite2.EB.05aFeS2
Pyrrhotite2.CC.10Fe7S8
Group 4 - Oxides and Hydroxides
Quartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
Ankerite5.AB.10Ca(Fe2+,Mg)(CO3)2
Calcite5.AB.05CaCO3
Unclassified Minerals, Rocks, etc.
'Chlorite Group'-
'Limonite'-(Fe,O,OH,H2O)
'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
Group 2 - SULFIDES
AmXp, with m:p = 1:1
Galena2.8.1.1PbS
Pyrrhotite2.8.10.1Fe7S8
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
AB(XO3)2
Ankerite14.2.1.2Ca(Fe2+,Mg)(CO3)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'-
'Limonite'-(Fe,O,OH,H2O)
'Wad'-

List of minerals for each chemical element

HHydrogen
H Limonite(Fe,O,OH,H2O)
CCarbon
C AnkeriteCa(Fe2+,Mg)(CO3)2
C CalciteCaCO3
OOxygen
O QuartzSiO2
O AnkeriteCa(Fe2+,Mg)(CO3)2
O CalciteCaCO3
O Limonite(Fe,O,OH,H2O)
MgMagnesium
Mg AnkeriteCa(Fe2+,Mg)(CO3)2
SiSilicon
Si QuartzSiO2
SSulfur
S PyriteFeS2
S GalenaPbS
S ArsenopyriteFeAsS
S PyrrhotiteFe7S8
CaCalcium
Ca AnkeriteCa(Fe2+,Mg)(CO3)2
Ca CalciteCaCO3
FeIron
Fe PyriteFeS2
Fe ArsenopyriteFeAsS
Fe AnkeriteCa(Fe2+,Mg)(CO3)2
Fe PyrrhotiteFe7S8
Fe Limonite(Fe,O,OH,H2O)
AsArsenic
As ArsenopyriteFeAsS
AgSilver
Ag SilverAg
AuGold
Au GoldAu
PbLead
Pb GalenaPbS

References

Sort by

Year (asc) Year (desc) Author (A-Z) Author (Z-A)
Lowell, F. L. (1916), Mines and mineral resources of the counties of Del Norte, Humboldt, Mendocino, Mariposa, Merced, San Joaquin, and Stanislaus: California Mining Bureau. (Report 14): 14: 580.
Castello, W.O. (1921), Mariposa County: California Mining Bureau. Report 17: 111.
Laizure, Clyde McK (1928), Mariposa, Madera Counties: California Journal of Mines and Geology, California Mining Bureau (Report 24): 24(2): 84, 124.
Bowen, O.E., Jr. & C.H. Gray, Jr. (1957), Mines and mineral deposits of Mariposa County, California: California Journal of Mines and Geology: 53(1&2): 90-91, 251.
Bowen, W.E. and Evans (1966).
Clark, Wm. B. (1970a) Gold districts of California: California Division Mines & Geology Bulletin 193.
Eidahl, D. (1977): Gold from the Colorado quartz mine. Mineralogical Record 8, 440-441
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 23, 24 (map 2-13).
Economic Geology (1987): 82: 328-344.
Rocks & Minerals (1988): 63: 49.
California Division of Mines and Geology (1990), Mines and mineral producers active in California (1988-89), California Department of Conservation, Division of Mines and Geology, Special Publication 103.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10034689, 10031125 & 10211836.
Cook, Lees, Francis (2009) The Colorado Quartz Gold Mine Mariposa County, California, Rocks & Minerals: 84: 396-412.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060430459.

USGS MRDS Record:10031125

Other Regions, Features and Areas containg this locality

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.
 
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Public Relations by Blytheweigh.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2019, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 19, 2019 13:05:45
Go to top of page