The province abounds in mineral resources, especially coal. The proven coal reserves account for approximately 203.5 billion tons, one third of the nationaltotal. Major coal fields are located near Taiyuan and Datong. Taiyuan has developed a coal export system and become a major coal export base for the country. Other major minerals are iron, copper , cobalt, aluminium, molybdenum and titanium . Among the non- metal minerals are gypsum, limestone, pearlite and marble. Deposits of bauxite account for 45 per cent of the national total, amounting to 940 million tons.