La Villeder, Le Roc Saint-André, Morbihan, Brittany, France
|Latitude & Longitude (WGS84):||47° 52' 14'' North , 2° 28' 30'' West|
|Latitude & Longitude (decimal):||47.87056,-2.47500|
|Name(s) in local language(s):||"la mine" "mine de la Villeder" (ou Ville Der)|
Pneumatolytic-hydrothermal quartz-cassiterite-beryl-arsenopyrite-molybdenite veins.
Probably worked in the Roman era.
About 10 pits have been dug in the past from 1853 onwards, among them the "puit Saint Michel" (256m deep, with numerous galleries).
All the pits are now flooded and secured.
The works lasted from ~1856 to 1916, with only minor ore production.
The remaining buildings have been restored and turned into a museum and a brewery.
An open cut ("la grande tranchée" ou "la grande carrière": "the great open cut" or "the great quarry") has been worked too: it still exists but is now private property and collecting is prohibited.
55 valid minerals.
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
443.8 - 541 Ma
|Cambrian-Ordovician sedimentary rocks|
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: 886.
Yann Lukas (1978) Roches et minéraux de Bretagne.
Pierrot, R., Chauris, L. et al. (1980) "Inventaire minéralogique de la France N°9" "Morbihan", éditions de BRGM, Orléans, pp 281-284.
Hubert, M. (1987). "Secteur stannifère de La Villeder." Le Cahier des Micromonteurs (3), p. 3.
De Ascencao Guedes, R. et al. (2001) "Les espèces minérales du district de La Villeder." Le Règne Minéral(Hors Série 7), 42-58.