The Polish Government has revealed that there are 11 companies bidding to acquire Zlotoyja-based quarry business Kopalnie Surowcow Skalnych Zlotoryja. The companies, which include KGHM Ecoren, Basalt Minerals of Germany, Gorazdze Kruszywa, Cemex and Eurovia Polska, have been cleared to carry out due diligence for the takeover.