New Mexico Bureau of Mines & Mineral Resources A DIVISION OF NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY...and Nancy Gilson New Mexico Bureau of Mines and Mineral Resources, Socorro, New Mexico 87801 SOCORRO,...1996 11 NEW MEXICO INSTITUTE OF MINING & TECHNOLOGY Daniel H. Lopez, President NEW MEXICO BUREAU OF...REGENTS Ex Officio Gary Johnson, Governor of New Mexico Alan Morgan, Superintendent of Public Instruction...ESSER, Lab Technician ROBERT W. EvELeth, Senior Mining Engineer NANCY S. GILSON, Assistant Editor KATHRYN |