German quarry products suppliers MSW Mineralstoffwerke Südwest GmbH & Co. KG - a subsidiary of Heinrich Mertz Kies- und Sandwerke GmbH & Co. KG - operate a limestone quarry in Mönsheim, near Stuttgart, producing aggregates mainly for use in road construction. The shell limestone extracted at the quarry contains large quantities of clay, which used to mean that, on average, 30-35% of the extracted material could not be sold. The pre-screened material comprising a mixture of clay and rock had to be deposited in the quarry as landfill. Therefore, MSW decided to look for a way to increase the yield of ongoing operations at the site whilst, at the same time, making it possible for stored waste material to be made usable.
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