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Description The Symposium on Materials Performance and the Deep Sea was presented during the Seventy-first Annual Meeting of the Society held in San Francisco, Calif., 23—29 June 1968. The symposium was sponsored by Committees G01 on Corrosion of Metals and G03 on Deterioration of Nonmetallic Materials in cooperation with the Marine Technology Society, Bay Chapter. H. W. Dubach, U.S. Naval Oceanographic Office, served as chairman of this symposium, and J. C. Freche, National Aeronautics and Space Administration, served as co-chairman. J. V. Dwyer, Bechtel Corp., presided at the Session on Nonmetals, and F. M. Rinehart, U.S. Naval Civil Engineering Laboratory, presided at the Session on Metals. Members of the program committee consisted of: W. H. Ailor, Jr., Reynolds Metal Co.; W. M. Bejuki, Bioscience Information Corporation of Biological Abstracts; C. J. Wessel, John I. Thompson Co.; H. L. Hamilton, Ocean City Research Corp.; John Padan, Bureau of Mines; and A. W. Anderson, Washington Science Center.

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The only geophysical method that can image deep structures with the precision required for targeting and discovering new resources is reflection seismic. However, mineral prospecting with seismic methods is not straightforward. Lack of understanding of the seismic response, necessity to adapt the method to the specifics of each target and underestimating the complexity of mineral environments introduced complexities that have resulted in its sporadic rather than systematic application. Here we present and briefly discuss the results and the lessons learnt after more than a decade of dedicated investigations in different mineralised environments. We expect that seismic will become a standard geophysical method for exploration of most brown and then green fields.