the pit "is located in the 'Im Unterfeld' district, E of Frauenweiler... From 1972 to 1989 it was exploited by the Bott, respectively Bott-Eder company (Rauenberg), since 1989 by the Trost company... It covers an area of about 1/4 km2, with a maximum depth of about 25 m": coordinate based on nearby
