©2012 Society of Economic Geologists, Inc. Economic Geology, v. 107, pp. 1073–1077 Volcanogenic Massive Sulfide Occurrence Model. W.C.

usgs.gov/sir/2010/5070/c/>. This is one of a series of ore deposit models, written by sci-entists of the U.S. Geological Survey, which at present include contributions on Mississippi Valley-type lead-zinc deposits (Leach et al., 2010) and porphyry copper deposits (John et al., 2010). The stated purposes of this VMS model are as fol-lows: (1) for national assessment of the mineral potential for these deposits in the United States, and (2) to assist explora-tion geologists, students, and teachers of economic geology, and researchers interested in understanding the origin of this important deposit type in the context of earth history and plate tectonics. Among the latter group is a large interna tional group of scientists studying the distribution, characteris tics, and origin of VMS deposits on the modern seafloor. Most of the stages of VMS exploration, mining, and reme