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Geochemical exploration, a relatively new methodology in the search for ore deposits, is based on established principles of the geochemical cycle and distribution of the elements. The rise of this new technique is directly attributable to the huge demands placed by industrial development on the continuance of supplies of mineral raw materials. Until recently the emphasis in exploration for ores has been on exposed mineral deposits, but future supplies must come largely from concealed deposits; these will be found by using varied techniques of sampling and analysis combined with improved models of ore genesis and distribution. Exploration geochemistry offers great advantages in the search for mineral deposits when conducted with the support of other geological and geophysical methods. Some examples of geochemistry applied to mineral exploration were selected from work by the U.S. Geological Survey to provide as broad a spectrum as possible of geochemical concepts and procedures in relation to deposit types, geometry of exposure, climatic environment, scale, and sample media. Adaptations and modifications of these procedures are expected to have prominent roles in future exploration for concealed mineral deposits.

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