Lafarge Clay and limestone are hauled 1 61 km 1 mi to the Paulding cement plant and 3 22 km 2 mi to the Alpena site Silica fume is transported to the Paulding plant 241 km 150 mi Sand is transported to the Paulding and Alpena plants 80 km 50 mi and 16 km 10 mi respectively Gypsum is transported to the Paulding plant 97 km 60 mi