Vote for your favorite mineral in #MinCup26! - Sphalerite vs. Anorthite
Both zinc ore Sphalerite and calcium plagioclase feldspar Anorthite have perfect cleavage that will split cleanly if you hit them with a hammer, but only one can claim a larger split of your votes!
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

Great Onslow Consols (Great Michell Consols), St Breward, Cornwall, England, UKi
Regional Level Types
Great Onslow Consols (Great Michell Consols)Mine
St BrewardCivil Parish
CornwallCounty
EnglandConstituent Country
UKCountry

This page is currently not sponsored. Click here to sponsor this page.
PhotosMapsSearch
08483660017272064218023.jpg
Siderite, etc.

Great Onslow Consols, St Breward, Cornwall, England, UK
08483660017272064218023.jpg
Siderite, etc.

Great Onslow Consols, St Breward, Cornwall, England, UK
01107740017272064225722.jpg
Siderite, etc.

Great Onslow Consols, St Breward, Cornwall, England, UK
Latitude & Longitude (WGS84):
50° 34' 2'' North , 4° 41' 20'' West
Latitude & Longitude (decimal):
50.56722,-4.68889
GeoHash:
G#: gbuxtm3xk
GRN:
N34W03
UK National Grid Reference:
SX096777
Type:
Mine
Köppen climate type:
Cfb : Temperate oceanic climate
Nearest Settlements:
PlacePopulationDistance
Camelford2,335 (2017)6.1km
Delabole1,647 (2017)6.9km
Bodmin14,614 (2017)10.9km
Tintagel1,028 (2017)11.5km
Wadebridge6,599 (2017)11.8km
Nearest Clubs:
Local clubs are the best way to get access to collecting localities
ClubLocationDistance
British Micromount Society, Devon and Cornwall Branch MeetingsLiskeard, Cornwall20km
Mindat Locality ID:
33458
Long-form identifier:
mindat:1:2:33458:4
GUID (UUID V4):
0


First worked as Great Michell Consols from 1848 until its abandonment in 1848. The set was then worked as Great Onslow Consols from 1851 till around 1870-1880 (HJ)

The mine is well known for the unique siderite crystals it produced.

During 1853-6 and 1860, the mine produced 935 tons of 3.5% copper ore, and from 1856-60, tons of pyrite (Dines)

Select Mineral List Type

Standard Detailed Gallery Strunz Chemical Elements

Commodity List

This is a list of exploitable or exploited mineral commodities recorded at this locality.


Mineral List


8 valid minerals.

Gallery:

List of minerals arranged by Strunz 10th Edition classification

Group 2 - Sulphides and Sulfosalts
ⓘChalcocite2.BA.05Cu2S
ⓘSphalerite2.CB.05aZnS
ⓘPyrrhotite2.CC.10Fe1-xS
ⓘPyrite2.EB.05aFeS2
ⓘArsenopyrite2.EB.20FeAsS
Group 3 - Halides
ⓘFluorite3.AB.25CaF2
Group 4 - Oxides and Hydroxides
ⓘQuartz4.DA.05SiO2
Group 5 - Nitrates and Carbonates
ⓘSiderite5.AB.05FeCO3
Unclassified
ⓘ'Chlorite Group'-

List of minerals for each chemical element

CCarbon
Cⓘ SideriteFeCO3
OOxygen
Oⓘ QuartzSiO2
Oⓘ SideriteFeCO3
FFluorine
Fⓘ FluoriteCaF2
SiSilicon
Siⓘ QuartzSiO2
SSulfur
Sⓘ ArsenopyriteFeAsS
Sⓘ ChalcociteCu2S
Sⓘ PyriteFeS2
Sⓘ PyrrhotiteFe1-xS
Sⓘ SphaleriteZnS
CaCalcium
Caⓘ FluoriteCaF2
FeIron
Feⓘ ArsenopyriteFeAsS
Feⓘ PyriteFeS2
Feⓘ PyrrhotiteFe1-xS
Feⓘ SideriteFeCO3
CuCopper
Cuⓘ ChalcociteCu2S
ZnZinc
Znⓘ SphaleriteZnS
AsArsenic
Asⓘ ArsenopyriteFeAsS

Geochronology

Geologic TimeRocks, Minerals and Events
Phanerozoic
 Paleozoic
  Permian
   Guadalupian
ⓘ Major polymetallic mineralization~270 MaCornwall, England, UK
   Cisuralian
ⓘ Porphyry dikes intruded (latest age)~275 MaCornwall, England, UK
ⓘ Greisenization (latest age)~280 MaCornwall, England, UK
ⓘ Porphyry dikes intruded (earliest age)~280 MaCornwall, England, UK
ⓘ Formation of metallized pegmatites~285 MaCornwall, England, UK
ⓘ Greisenization (earliest age)~285 MaCornwall, England, UK
ⓘ Emplacement of major plutons~295 MaCornwall, England, UK

Other Regions, Features and Areas containing this locality

British and Irish IslesGroup of Islands
Eurasian PlateTectonic Plate
EuropeContinent
UK

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

Dines, H. G. (1956) Memoirs of the Geological Survey (1st ed.) Vol. 2 - The Metalliferous Mining Region of South-West England. Geological Survey of Great Britain, London.
Hamilton Jenkin, A. K. (1970) Mines and Miners of Cornwall Vol. 16 - Wadebridge, Camelford and Bude. Forge Books, Bracknell.pp.10-12
Quick NavTopCommoditiesMineral ListGeochronologyOther 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 3, 2026 05:51:56 Page updated: August 23, 2025 10:50:57
Go to top of page