Features of distribution of chemical elements in rocks are considered as a geochemical criterion in the study of magmatic and sedimentary complexes of rocks and their relationship with minerals. As it is known, geochemical studies increase the depth of search for mineral deposits. These searches are based on the study of the regularity of distribution of chemical elements in rock strata. Consequently, for geochemical prospecting it is important to simultaneously determine many chemical elements and their quantitative ratio in various rocks of separate regions, sites and zones of the investigated territory. In this case, a large number of samples are investigated. It can be hundreds, thousands and tens of thousands of analyses. The main volume of analysis is made up of rocks and loose sediments. Minerals and ores in this case represent a smaller number of determinations, but their performance can be specific ...