Lime stone is used as an important raw material for the production of Cement Lime Stone is an important mineral product of Assam. Lime stone mines in Assam are situated at Garampani and Koliajan in the district of Karbi Anglong and North Cachar Hills. Total reserves of limestone in Garampani and Koliajan area are estimated to be 78 mil- lion tonnes and 81 million tonnes respectively. Limestone in Assam is high quality. Bokajan Cement Factory is based on the lime stone reserve of Koliajan.