The paper treats methodology problems in the geological prospecting bearing of mineralogy and geochemistry. The major tendencies in their development during 1970-80-th decades are shown with example of local prognostication tasks having been resolved in this time for tin-ore deposits. This example brings in evidence the need to restore back the meaning of an inexorable link, even unity, between mineralogy and geochemistry, and so the necessity to pattern on this base the mere methodology of geological prospecting.
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