Closed in 1986.
At the contact zone between Silurian metasediments and syntectonic Infra-Westphalian granite.
Vertical and subhorizontal quartz veins, associated with two later conical collapse breccias, cemented by quartz.
Three mineralization episodes (330-290°C / Pmax = 1000-650 bars) :
1) Tungstates precipitation (10 % eq NaCl, with HCO3-)
2) Main sulfide precipitation (molybdenite, arsenopyrite, bismuthinite, pyrrhotite, sphalerite, etc.)
3) Hydrothermal alteration : Pyrrhotite --> pyrite/marcasite ; precipitation of bismuth, galena and various sulfosalts : Cu-Bi-Pb, Pb-Bi-Ag, Ag-Bi, Cu-Bi
Ref.:
- Werner, A.B.T., Sinclair, W.D., and Amey, E.B. (1998): International Strategic Mineral Issues Summary Report - Tungsten. US Geological Survey Circular 930-O.
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Map Reference: 41°41'N , 7°49'W
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Mineral List:36 entries listed. 29 valid minerals.
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