A years-long effort to make U.S. companies disclose the use of minerals from war-torn African countries could finally go into effect this year...unless business groups...can get a court to toss it out...[National Association of Manufacturers, US Chamber of Commerce, Business Roundtable] are set to argue in the U.S. Court of Appeals...that the provision is too expensive and hard to implement... Advocates for the requirement argue that trade in gold, tin and other minerals from the Democratic Republic of the Congo supports armed groups that terrorize, rape, and kill civilians. The provision was written into the 2010 Dodd-Frank law...Amnesty International...argues that increased transparency will help stop the flow of money to armed groups in DRC...These "efforts are intended to invalidate the requirement that companies investigate and disclose information that many people think companies should already know: whether their products contain conflict minerals that finance armed groups responsible for appalling human rights abuses..." Amnesty argued in its brief to the court [refers to Dollar General, Lowe's, Cabela's]