Minerals, and the adequacy of America's mineral supply, are subjects of growing national concern in the 1980's. They have been subjects of concern to the Bureau of Mines for most of this century. The Bureau's mission is to help assure an adequate and dependable flow of minerals at reasonable costs. That mission is pursued through the acquistion and analysis of minerals data on a worldwide basis, and through research to make mining and mineral processing safer, more productive, and more compatible with the effective use of all the nation's resources. Research 83 is the 13th annual summary of significant developments in Bureau programs. It reflects both the scope of the Bureau's mission, and the success with which that mission is being pursued.