PREMO, Wayne R., US Geological Survey, MS 963, Denver Federal Center, Denver, CO 80225, wpremo@usgs.gov, DEWITT, Ed H., Central Mineral Resources Team, US Geological Survey, MS 973, Denver Federal Center, Lakewood, CO 80225, MOSCATI, Richard J., U.S. Geological Survey, Box 25046, MS963, Denver Federal Center, Denver, CO 80225, COSCA, Michael A., USGS, Box 25046, Denver, CO 80225-0046, STOESER, Douglas, Central Region Mineral Resources Team, USGS, Mail Stop 973 Box 25046 DFC, Denver, CO 80225, and PREMO, Virginia L., Dept. of Chemistry, Colorado School of Mines, Golden, CO 80401