Spoil tip Beckstrasse, Spoil tip in Bottrop, Germany

Halde Beckstraße is a spoil tip of the Prosper-Haniel colliery in Bottrop, heaped from 1963 to 1980 into a flat-topped hill (Tafelberg) covering 30.43 hectares and holding 11.8 million cubic metres. It rises 67 metres above its surroundings to a summit of 114 metres above sea level. On top stands the walkable Tetraeder, about 60 metres tall; together they form the Haldenereignis Emscherblick.

The site was created between 1963 and 1980 as a waste pile from the Prosper-Haniel coal mine, containing about 11.8 million cubic meters of mining material. The tetrahedron structure was added later to transform this industrial remnant into a regional landmark.

The hill and its tetrahedron form the Haldenereignis Emscherblick, a named landscape-art project on the Route of Industrial Heritage. The tetrahedron is about 60 metres tall and can be climbed, giving views over Bottrop and the Emscher valley. The neighbouring Halde Prosperstraße lies east, separated by a railway line.

Access to the tetrahedron platform involves climbing 387 steps along the outside of the steel structure. The route is exposed to the elements and accessible year-round, so wear appropriate clothing for outdoor conditions.

On weekends from 2009 to 2014, a hydrogen-powered bus of the Vestische Straßenbahnen ran up to the plateau of the heap, carrying passengers to the Tetraeder. It was a regular route of the local public transport network, not a test track.