Abstract
Regional geochemical surveys are used to locate large geochemical provinces, i.e., to describe large-scale variation of element concentrations, while local-scale surveys and detailed studies are aimed at revealing ore suboutcrops or point sources of contamination. The geochemical information obtained from regional-scale surveys is also important as background information for environmental legislation describing the natural geological level of element concentrations. Thus the surveys are often multipurpose/multidisciplinary studies that include several different sample materials such as soils, sediments, water or biota collected at one time for different purposes. The sampling network can be based on drainage basins or on more or less regular grids. Sample density varies from one sample per square kilometer to one sample per thousands of square kilometers.
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