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

Greenhorn prospect, Chicago Park, Nevada County, California, USAi
Regional Level Types
Greenhorn prospectProspect
Chicago ParkPark
Nevada CountyCounty
CaliforniaState
USACountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
Latitude & Longitude (WGS84):
39° 8' 52'' North , 120° 56' 39'' West
Latitude & Longitude (decimal):
39.14769,-120.94413
GRN:
N27W67
Type:
Prospect
Köppen climate type:
Csb : Warm-summer Mediterranean climate
Nearest Settlements:
PlacePopulationDistance
Colfax2,005 (2017)5.3km
Alta Sierra6,911 (2011)9.5km
Dutch Flat160 (2011)11.2km
Grass Valley12,944 (2017)12.8km
Alta610 (2011)13.2km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
Nevada County Gem & Mineral SocietyGrass Valley, California13km
El Dorado County Mineral and Gem SocietyPlacerville, California48km
Gold Country Treasure SeekersPlacerville, California48km
Mindat Locality ID:
84192
Long-form identifier:
mindat:1:2:84192:3
GUID (UUID V4):
0


A Cu occurrence/prospect located in sec. 14, T15N, R9E, MDM, 2.0 km (1.2 miles) E of Chicago Park, along the E side of Greenhorn Creek near its confluence with the Bear River. MRDS database stated accuracy for this location is 1,000 meters. The unidentified shaft shown in the NE¼NW¼ sec. 14 on the topo map may be this prospect?

Mineralization is hosted in serpentinite and slate. Chalcopyrite occurs as disseminated material near a serpentine-slate contact. Local rocks include Jurassic marine rocks, unit 1 (Western Sierra Nevada and Western Klamath Mountains).

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Mineral List


1 valid mineral.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcopyrite2.CB.10aCuFeS2

List of minerals for each chemical element

SSulfur
Sⓘ ChalcopyriteCuFeS2
FeIron
Feⓘ ChalcopyriteCuFeS2
CuCopper
Cuⓘ ChalcopyriteCuFeS2

Other Databases

Link to USGS MRDS:10031792

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 #0060570469
Lindgren, Waldemar (1900) Colfax folio, California. Folios of the Geologic Atlas 66. US Geological Survey doi:10.3133/gf66
Waring, Clarence A. (1917), Placer County: Report 15 of the State Mineralogist, California State Mining Bureau (Report 15): 15: 329.
Bramel, Hadley R., Heyl, George R., Cox, Manning W., Ransome, Alfred L., Eric, John H., Wyant, Donald G. (1948) Copper in California. Bulletin 144. California State Mining Bureau p.282
(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 13:45:50 Page updated: October 15, 2025 16:42:34
Go to top of page