McGraths Limestone (Cong) Ltd is a 100% family owned & operated company with over 60 years experience in the business. Quarrying started in the Cong area in the 1950's due to the introduction of the subsidy for the haulage of Ground Limestone for agricultural purposes. CongCal, a division of McGraths Limestone Works Ltd., brings over 50 years’ experience to the quarrying and processing of limestone products. Our calcium carbonate deposits are considered one of the purest in Ireland and the UK with 99.2% pure calcium carbonate. We supply customers in over 20 countries from Ireland and our depots in Scotland and Sweden, and a broad number of industries including the construction, glass, agriculture, industrial and energy sectors.