The resulting database file was loaded to ArcView and converted to ESRI Shapefile format. The result was then converted back to shapefile format. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the U.S. Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Acknowledgment of the National Atlas of the United States of America would be appreciated in products derived from these data. Attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.
Point features present.
This category includes only U.S. minerals operations covered by the Minerals Information Team of the U.S. Geological Survey and considered currently active in 1997. No energy minerals operations are included. The name of the facility. The name of the company which operates the facility. The State in which the facility is located.