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Marsanges Mine, Marsanges, Langeac, Haute-Loire, Auvergne-Rhône-Alpes, France

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Latitude & Longitude (WGS84): 45° 2' 42'' North , 3° 29' 3'' East
Latitude & Longitude (decimal): 45.04500,3.48417
Köppen climate type:Cfb : Temperate oceanic climate
Name(s) in local language(s):Ancienne mine de fluorine de Marsanges
Other/historical region names associated with this locality:Auvergne; Rhône-Alpes


A former fluorite mine located near Marsanges, 6.5 km SSW of Langeac. Started in 1830 for the antimony extraction but quickly shifted to the fluorite extraction, this mine worked several large veins consisting mainly of fluorite and quartz, hosted in gneisses. This deposit, which was one of the biggest in France, was mined until 1975 by the Pechiney company (SECME) which produced 930,000 tons of fluorite and until 1977 by P. Lebrat. The finest fluorite specimens of Haute-Loire come from this famous deposit. Today, all mine entries are closed or collapsed but some large dumps still remain near some former adits. Note that the map below shows the headquarters but the exploitation work went on the mountainside above.

According to J.-J. Périchaud (1970), 4 mineralizing stages are known:

1) faulting of gneisses then grey quartz and sulphides (pyrite, arsenopyrite, stibnite ...) deposits (during Stephanian/Permian)

2) further enlargement of the veins and large filling by purple and/or green (octahedral or massive) fluorite with quartz (fluids at 145°C during Triassic / Lower Lias).

3) deposits (in vugs) of blue/yellow/colorless cubic fluorite with sulphides (chalcopyrite, pyrite, bournonite, galena, sphalerite...) and quartz, siderite, dolomite, baryte, calcite...

4) In the upper parts of the veins, alteration of sulphides and deposits of secondary minerals (chalcanthite, cerussite, goethite...)

Apart from the main vein ("filon principal"), which was the biggest fluorite heap of the deposit (50 m in high, 70 m in length and 18 m in width, this heap resulting from crossing the Communal vein, Pastro vein and X vein), many other veins are known and were mined. Here are the largest:
- Le Communal (Costebois) vein: This vein is the longest vein of the deposit (600 m in length, 3 m in width). Its northern part was operated by P. Lebrat and its southern part by the Pechiney company.
- Marmeisse vein: the western vein of the deposit with the most abundant sulphides, especially galena and sphalerite.
- Pastro vein: the southern vein of the deposit, rich in stibnite.
- X vein and Y vein: two "small" veins (200 m in length, 1 m in width) next to the Pastro vein.
- Les Italiens vein: a vein west of the Costebois vein.
- n°5 vein and n°4 vein (in the lower levels): two veins east of the Costebois vein.
Most mineral specimens come from these veins which contain many vugs but some specimens were also found in the smallest veins.


Mineral List


45 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



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)
CHERMETTE A. (1960) - Les Ressources de la France en spath fluor (Haute-Loire), Paris, Technip
CHERMETTE A. (1986) - La Fluorite, Paris, G. Lachurié
CHERMETTE A. (1993) - L'Epopée de la fluorite française - Bull. mens. Soc. linnéenne de Lyon, 1993, 62 (6) : 178-188
Collectif (2005) - Les Fluorines de la Haute-Loire et du Puy-de-Dôme, Le Règne Minéral, Hors-série XI
DERRE C. (1972) - Histoire des filons de fluorine et du bassin houiller de Langeac (Haute-Loire), Thèse de Doctorat Université de Paris VI
PELISSON P. G. (1989) - Etude Minéralogique et Métallogénique du district filonien polytype de Paulhaguet (Haute-Loire, Massif Central Français), Thèse de Doctorat, Orléans, France
PERICHAUD J.-J. (1986) - Où trouver les minéraux d'Auvergne, tome 2 : Cantal, Haute-Loire
PERICHAUD J.-J. (1970) - Les Gisements Métalliques du district à antimoine de Brioude-Massiac, Thèse de Doctorat
PERINET F. (2014) - Minéraux des terres rares de Marsanges (Haute Loire). Le Cahier des Micromonteurs N° 123 pp. 18-22
VIALARON C., LUCAS C., BAYLE L.-D., (2005) - La fluorine en Haute-Loire, Le Règne Minéral, Les Fluorines de la Haute-Loire et du Puy-de-Dôme, Hors-série XI
VIALARON C. (1997) - Les gisements fluorés et sulfurés de Barlet-Marsanges près Langeac, Haute-Loire

External Links

CHERMETTE A. (1993) - L'Epopée de la fluorite française - Bull. mens. Soc. linnéenne de Lyon, 1993, 62 (6) : 178-188
http://www.linneenne-lyon.org/depot/5032.pdf


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