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In 1972, at the 24th International Geological Congress, the International Union of Geological Sciences under the United Nations Educational, Scientific and Cultural Organization (UNESCO) established the International Geological Correlation Program (IGCP). The IGCP was to study the relationship between theoretical and practical geological problems through international cooperation. One of these programs, Economic Super Accumulations of Metals in the Lithosphere, describes relationships between the origin of large concentrations of metals in the crust and deep structure of the lithosphere.