Vote for your favorite mineral in #MinCup26! - Bournonite vs. Vesuvianite
Cogwheels of bournonite are up against colourful vesuvianite.
Log InRegister
Quick Links : The Mindat ManualThe Rock H. Currier Digital LibraryMindat Newsletter [Free Download]
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 ElementsThe Rock H. Currier Digital LibraryGeologic TimeExplore Fossils
Minerals by PropertiesMinerals by ChemistryMineral Visual ExplorerAdvanced 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 MuseumsClubs & OrganizationsMineral Shows & EventsThe Mindat DirectoryDevice SettingsThe Mineral QuizTime Machine
Photo SearchPhoto GalleriesSearch by ColorPhoto Colour ExplorerNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day GalleryPhotography

Johnson placer, Kentucky House, San Andreas Mining District, Calaveras County, California, USAi
Regional Level Types
Johnson placerPlacer
Kentucky House- not defined -
San Andreas Mining DistrictMining District
Calaveras CountyCounty
CaliforniaState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
38° 10' 0'' North , 120° 38' 34'' West
Latitude & Longitude (decimal):
38.16667,-120.64278
GeoHash:
G#: 9qf1nsn8g
GRN:
N26W68
Type:
Placer
Köppen climate type:
Csa : Hot-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
San Andreas2,783 (2011)4.6km
Mountain Ranch1,628 (2011)11.2km
Angels Camp2,677 (2012)14.2km
Mokelumne Hill646 (2011)15.9km
Murphys2,213 (2015)16.2km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Calaveras Gem & Mineral SocietyAngels Camp, California14km
Amador County Gem & Mineral SocietySutter Creek, California29km
Mindat Locality ID:
75427
Long-form identifier:
mindat:1:2:75427:4
GUID (UUID V4):
0


A former placer Au occurrence/drift mine located in secs. 22 & 27, T3N, R13E, MDM, about 2.65 km ENE of Kentucky House, about 4.65 km N of Fourth Crossing and about 5 km SE of San Andreas, N of Calaveritas Creek. Located prior to 1900. Owned by Romie Rolleri. MRDS database stated accuracy for this location is 100 meters.

Mineralization is a placer Au deposit located on the Central Hill paleochannel. Local rocks include Tertiary pyroclastic and volcanic mudflow deposits, unit 9 (Cascade Range).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


1 valid mineral.

Detailed Mineral List:

ⓘ Gold
Formula: Au
Description: Placer material occurring in a paleochannel.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 1 - Elements
ⓘGold1.AA.05Au

List of minerals for each chemical element

AuGold
Auⓘ GoldAu

Other Databases

Link to USGS MRDS:10029068

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

(n.d.) Minerals Availability System (MAS), U.S. Bureau of Mines.file ID #0060091101
Kerr, M.B. (1900), Register of Mines and Minerals, County of Calaveras, California, California Mines Bureau, 27 pp.
Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology, California Division of Mines (Report 32): 32(3): 360.
Clark, William B., Lydon, Philip A. (1963) Mines and Mineral Resources of Calaveras County, California. County Report 2. California Division of Mines and Geology
Clark, L.D., Stromquist, A.A., and Tatlock, D.B. (1963), Geologic Map of the San Andreas Quadrangle, Calaveras County, California, USGS Geologic Quadrangle Map GQ-222, scale 1:62,500.
(2005) Mineral Resources Data System (MRDS), US Geological Survey.
Quick NavTopMineral ListOther DatabasesOther RegionsReferences
 
and/or  
Mindat.org® is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization. Mindat® and mindat.org® are registered trademarks of the Hudson Institute of Mineralogy.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2026, except where stated. Most political location boundaries are © OpenStreetMap contributors. Mindat.org relies on the contributions of thousands of members and supporters. Founded in 2000 by Jolyon Ralph and Ida Chau.
Content on this site may not be used to train, fine-tune, or otherwise develop artificial intelligence or machine learning models without prior written permission - see our Terms & Conditions.
To cite: Ralph, J., Von Bargen, D., Martynov, P., Zhang, J., Que, X., Prabhu, A., Morrison, S. M., Li, W., Chen, W., & Ma, X. (2025). Mindat.org: The open access mineralogy database to accelerate data-intensive geoscience research. American Mineralogist, 110(6), 833–844. doi:10.2138/am-2024-9486.
Privacy Policy - Terms & Conditions - Contact Us / DMCA issues - Report a bug/vulnerability Current server date and time: September 4, 2026 06:00:25 Page updated: July 26, 2025 01:17:23
Go to top of page