The special quality of the silica sands from our Haltern plant has always been valued by experts. The Haltern silica sands that were created in the Cretaceous period are mined exclusively below the water table using suction dredgers. Sands are mined in Haltern that are particularly sought after in foundry sector. At the plant the silica sand is processed by means of hydraulic classification, then being supplied as wet sand, dry sand or powders. In addition, silica sands with customized grading curves can be produced in the affiliated screening tower.