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Chessy copper mines, Chessy-les-Mines, Villefranche, Rhône, Auvergne-Rhône-Alpes, France

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Latitude & Longitude (WGS84): 45° 53' 45'' North , 4° 36' 46'' East
Latitude & Longitude (decimal): 45.89583,4.61278
Köppen climate type:Cfb : Temperate oceanic climate
Name(s) in local language(s):Anciennes mines de cuivre de Chessy
Other/historical region names associated with this locality:Rhône-Alpes


The ore deposit of Chessy-les-Mines was mined for copper in the Middle Ages until 1875. It's a "stockwerk" mineralization with barite, galena, sphalerite and chalcopyrite hosted in altered soda-dacitic lavas near the devonian Brévenne rift. This orebody was covered by Triassic sediments (clay and sandstone) which were mineralized in turn by hydrothermal fluids during their deposit. Then, primary sulphides were oxidized (during Eocene?) allowing the formation of secondary minerals of lead, zinc and especially copper (azurite, cuprite, malachite, agardite, chrysocolla ...). It is these secondary minerals that have build the celebrity of the Chessy mines, thanks to superb specimens of azurite (called here "chessylite") displayed in many collections today. This reputation has been built from 1811 when the miners opened the famous "Blue Mine" which contained many vugs of azurite. At the time of operation, engineers distinguished four different parts in the deposit:

The "yellow Mine": native ore (chalcopyrite, pyrite) in speckles or nodules in the dacites

The "black Mine": reduced ore (tenorite, native copper) in black nodules in the altered dacites (contact dacites / Triassic)

The "red Mine": oxidized ore (cuprite, limonite) released into the red clay of the Lower Triassic

The "blue Mine": highly oxidized ore (azurite, cuprite, malachite and smithonite) in clays and sandstones of Middle and Upper Triassic.

Today, the mine is closed but the dumps were bought by the Geological Club of l'Arbresle who conducts regular searches.


Commodity List

This is a list of exploitable or exploited mineral commodities recorded from this region.


Mineral List

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

Actinolite

Adamite

var: Cuprian Adamite

Agardite-(Nd)

Agardite-(Y)

Allophane

Aluminocopiapite

Alunite Supergroup

Andalusite

Andradite

var: Melanite

Anglesite

Anhydrite

'Apatite'

Aragonite

Arsenolite

Arsenopyrite

Aurichalcite

Autunite

Azurite (TL)

Baryte

'Biotite'

Bismuth

Bismuthinite

Boothite

Bornite

Boulangerite

Bournonite

Breithauptite

Brochantite

Cacoxenite

Calcite

Cassiterite

Cerussite

Chalcanthite

Chalcocite

Chalcophyllite

Chalcopyrite

Chrysocolla

Clinochlore

Cobaltite

Conichalcite

Connellite

Copper

Corundum

Cosalite

Covellite

Cubanite

Cuprite

var: Chalcotrichite

Devilline

Digenite

Duftite

'Electrum'

Epidote

Epsomite

Euchroite ?

'Feldspar Group'

Fougèrite

Gahnite

Galena

'Garnet'

Goethite

Gold

Goslarite

Goudeyite

Gypsum

Halite

'Halloysite'

Hematite

Hemimorphite

Hydrozincite

Ilmenite

Kaolinite

Langite

Lead

Lepidocrocite

Libethenite

'Limonite'

Linarite

Mackinawite

Magnetite

Malachite

Manganite

Marcasite

Melanterite

var: Cuprian Melanterite

Meneghinite

Mercury

Mimetite

Molybdenite

Montmorillonite

Muscovite

Olivenite

Opal

Orthoserpierite (TL)

Pearceite

Plancheite

Polybasite

Pseudomalachite

'Psilomelane'

Pyrite

Pyrolusite ?

Pyrrhotite

Quartz

var: Chalcedony

Rosasite

Rutile

Scheelite

Serpierite

Siderite

Silver

Smithsonite

Sphalerite

Stannite

Stephanite

Sulphur

Tennantite

Tenorite

Tetrahedrite

Titanite

'Tourmaline'

Turquoise

Tyrolite

Vesuvianite

Vivianite

Wulfenite

Zálesíite

Zircon


115 valid minerals. 2 (TL) - type locality of valid minerals.

Regional Geology

This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.

Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org

Neoproterozoic
541 - 1000 Ma



ID: 1383703
Neoproterozoic mixed volcanic, volcaniclastic and sedimentary rocks

Age: Neoproterozoic (541 - 1000 Ma)

Comments: This designation includes Precambrian iron-formation-bearing sedimentary and volcanic sequences, as well as mixed sedimentary and volcanic or volcaniclastic sequences.

Lithology: Mixed volcanic, volcaniclastic and sedimentary rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License


Localities in this Region

France
  • Auvergne-Rhône-Alpes
    • Rhône
      • Villefranche

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

Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Palache, C., Berman, H., & Frondel, C. (1951) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 254.
Poulain, P. (1997) Chessy-les-Mines (69), France. International Association of Collectors of Slag Minerals, 7(2), 1-2.
De Ascencao Guedes, R. (2003) Les minéraux et les minéralogistes de Chessy-les-Mines. Le Règne Minéral, Hors Série(9), 46-85.

Mineral and/or Locality  
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