The ore mine was a lead-zinc mine in the mountain town of Bad Grund (Harz) in the Harz (Lower Saxony). It was the last mining ore mine in the Federal Republic of Germany. The pit fields of the ore mine Grund lay on the Silver Rump, Rosenhöfer and Laubhütter Gangzug. These parts of the Upper Harz gait system extended from the western edge of the Harz at Gittelde to the Clausthal plateau in east-southeastern direction. Disturbances in the mountains formed a total of seven powerful ore mines that were the basis of the mine. The most important ores were galena and zinc blende with an average metal content of 10%. From this lead, zinc, copper and silver were obtained. The ore mine ground consisted of the fields of the mines help God in the west and mine welfare in the east. The pit building was open from west to east through the west shaft (depth 518 m), the Achenbach shaft (depth 719 m), the Knesebeck shaft (depth 499 m) and the Wiemannsbuchtschacht (depth 761 m). At historic shafts there were u. a. nor the help Gotteser shaft near the Achenbachschachtes and the Medingschacht (depth 517 m) in the Innerstetal. The mine was in the eastern part by the Tiefen-Georg-Stollen, which begins in the Grundner valley and completely through the Ernst-August-Stollen under it. The mines last reached up to the 21st level at a depth of 900 meters. The main promotion base was the 19th sole (about 700 m underground).