Otto Hieber

Kaolin AD produces, mines and trades kaolin, silica sand, chamotte and carbonate fillers. It also offers feldspar, dolomite, and limestone. The company was founded in 1924 and is headquartered in Senovo, Bulgaria.

EF Holding GmbH provides comprehensive services to support the iron and steel industry in all aspects of industrial waste management, logistics of raw materials, refractory recycling, and cleaning of production facilities. The private company is based in Salzgitter, Germany. The FRIEDRICH GRUPPE is a leading service provider in the iron and steel industry and has been responsible for sustainable management of industrial by-products for over 60 years. The German company offers high-quality secondary raw materials that are often superior in quality to primary raw materials. These materials are suitable for use in the construction industry, agriculture, and other sectors. The CEOs of the company are Jörgen Johannes Sassen, Franz Rudolf Stallmann, Ralf Jeffraim.

LL Global Resources SE operates mineral extraction and processing plants, focusing on minerals. The private company is based in Frechen, Germany. The CEOs of the German company are Robert Lindemann-Berk, Paul Páez-Maletz.

LL Holding GmbH provides management services. The private company is based in Frechen, Germany. The CEOs of the German company are Robert Lindemann-Berk, Paul Páez-Maletz.