Some more information just come in: in the Grube Clara near Oberwolfach in
the German Black Forest, silver ores are apparently mined as a by-product of
barite and fluorite mining. According to my information it is then
concentrated by flotation and sold to a local smelter. I'm not sure about
the ore mineral, probably tetrahedrite or tennanite.
Regards
--
Alan Johnson, Geotr@ns
www.geotrans-online.de
German-English, Geosciences/Technical
http://geotransblog.blogspot.com/
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