Viewpoint over the former On limestone quarry

Across the Wamme River, this escarpment marks the historic site of the former On limestone quarry, active as early as 1850 to support the construction of the railway line. Taken over and modernized by the Lhoist Group in 1924, the site now houses processing facilities converting limestone into lime. The industrial kilns are fed by Frasnian limestone extracted from the nearby Boverie quarry on the Gerny Plateau. Annual extraction and lime production levels have recently been scaled back to extend the lifespan of the currently permitted quarry.