Luxemburger Allee 47, D-45481 Mülheim, Ruhr, Germany a r t i c l e in fo abstract Article history:...(numbers according to Fig. 1): 1= Neu-Diepenbrock Mine III, Mülheim/ Ruhr (Gauss Krüger grid: R 2560250...2560250 H 5693750, topographic map 4607, Heiligenhaus sheet); 2= trials near shaft Ernst, Lintorf ARTICLE...Neu-Diepenbrock III Mine, Mülheim/Ruhr; 2 = Trials near shaft Ernst, Lintorf; 3= Thalburg Mine, shaft Luis,... Heiligenhaus. Strata-bound mineralization: 4= Rohdenhaus quarry, Wülfrath. The distance between sampling |