As the importance and dependence of specific mineral commodities increase, so does concern about their supply. The United States is currently 100 percent relian

A Reprint of the Original US Geological Survey Bulletin 1348. This publication is a catalog of locations, geology, and production from the placer districts of N

Manganese mineralization is diverse in occurence, origin, mineralogy and geochemistry. This volume includes a review of the range of terrestrial Mn deposits and