The site was historically one of the largest open-pit slate mines in Europe.
The central lake in the quarry has formed naturally from groundwater filling the deep basin.
It is part of the GeoPark Schieferland, highlighting the region's historical importance in slate extraction.
The quarry contains rare vertical geological layering visible to the naked eye along the rock walls.
The site features preserved industrial structures, including an old crushing facility and mine rail remnants.
The water within the quarry pit remains exceptionally clear due to its depth and the surrounding slate composition.
Staatsbruch Nature Reserve is a post-industrial mining landscape located in Lehesten, Germany, centered on the former Oertelsbruch slate quarry. The site is a primary component of the Technical Monument Schieferpark Lehesten, showcasing significant deep-quarrying history. Following the cessation of slate mining, the abandoned pit transitioned into a diverse habitat characterized by steep rock faces and high-altitude water bodies. It serves as a geological archive, exhibiting strata from the Paleozoic era. The reserve is notable for its role in industrial heritage preservation alongside environmental reclamation. Walking paths circle the former quarry, providing access to historical mining machinery and structures. It acts as a refuge for rare species, particularly those adapted to nutrient-poor rocky soils and permanent water collections.
The viewing platform near the edge of the main pit, which offers a wide-angle perspective of the water and the quarry walls.
Wear sturdy, closed-toe hiking boots, as the terrain consists of uneven slate trails and loose gravel.
Bring binoculars for birdwatching and observing geological features on the far side of the pit.
Stay strictly on marked paths, as the steep cliffs surrounding the quarry are unstable.
Attempting to climb the rock faces or venturing off marked trails, which is dangerous due to crumbling slate edges.
The outdoor nature reserve remains accessible year-round, though paths may be obstructed by snow or ice in winter.
No swimming or water entry due to depth and safety risks; carry out all trash to protect the local ecosystem.
