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Les Cougnasses mine, Orpierre, Hautes-Alpes, Provence-Alpes-Côte d'Azur, France

Photo: M.S.

Latitude: 44°19'31"N
Longitude: 5°44'0"E

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Host rocks : Callovo-Oxfordian black marlstones.
Complex mineralization in several phases :
1) Early siderite/ankerite precipitation
2) Sulphosalt Pb/Sb deposition with successive replacements (Pb/Sb grows with time).
3) Dissolution of preexisting ore and remobilizations.
Calcite late deposition.
Cryptocrystalline (with fluidal texture) lead sulfosalts (chlorosulfosalts, boulangerite and tetrahedrite) were deposited, after the crushing of massive semseyite along a slickenside.

Ore breccias with collomorph structures of alternating pyrite, sphalerite and sulphosalts.
Old mine (before 1800) : a gallery with small dumps and mineralized outcrops.

Mineral List

31 entries listed. 28 valid minerals. 1 type locality (valid mineral).

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References

Y. MOELO, P. PICOT, R. PIERROT
"L'indice a sulfoantimoniures de plomb des Cougnasses (commune d'Orpierre, Hautes Alpes). Partie I : minéralogie du minerai" - Bull. Soc. fr. Mineral. Cristallogr. (1975) 98, 299-307
Y. MOELO, C. LEVY
"L'indice a sulfoantimoniures de plomb des Cougnasses (commune d'Orpierre, Hautes Alpes). Partie II : étude paragénétique" - Bull. Soc. fr. Mineral. Cristallogr. (1976) 99, 38-49
J.-M. FOURCAULT
"Le gisement à sulfosels de plomb des Cougnasses (Hautes-Alpes)" - Le Cahier des Micromonteurs (02-1991) 3-13

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Copyright © Jolyon Ralph and Ida Chau 1993-2012. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
Current server date and time: 24th Nov 2012 21:41:38