The location at the mine. Graukaue is located in the 'Lohnhalle'.
On the western side of Fürst-Leopold-Platz, there's the main entrance of building no. 1, which reads “Lohnhalle”. At the end of the hallway, two stairs to the left lead into the interior space of the Lohnhalle. The staircase is on the right. On the third floor (2. OG), in room 2L-14/15, the leftmost office on the opposite side, there's Graukaue.
From the parking lot behind the Lohnhalle (at the corner of Halterner Straße and Zechenstraße), you have direct access to the staircase.
Entrance to the Lohnhalle
Passage to the Lohnhalle
Interior space of the Lohnhalle