Jacob A Covault, Bureau of Economic Geology, The University of Texas at Austin, Austin, TX, United States, Zoltan Sylvester, The University of Texas at Austin, Bureau of Economic Geology, Austin, TX, United States, Paul Morris, The University of Texas at Austin, Bureau of Economic Geology, Austin, United States and Dallas Dunlap, University of Texas at Austin, Bureau of Economic Geology, Austin, TX, United States