Malaysia Smelting Corp., the biggest buyer of tin ore from the Democratic Republic of Congo, will support a government ban on exports of the mineral from parts of the country, said ITRI Ltd., a tin industry group...Congo is under pressure from rights groups and a new U.S. law against so-called conflict minerals to prevent its vast natural resources from being used to back armed movements. Some members of the Congolese army and insurgents support themselves by controlling or taxing the mineral trade in the provinces of North and South Kivu and Maniema. The three provinces are rich in cassiterite, gold, wolframite and coltan, an ore containing tantalite that is used in the manufacture of mobile phones.