Mineralogic forms of trace elements in a given rock may be predicted by estimating the Eh-pH conditions that prevailed in the rock from the theoretical stability fields of the major minerals present, and by determining the minor element minerals that would be expected under these conditions. Moderate correspondence between theoretical and experimental phases was obtained using Eh-pH diagrams for silver, molybdenum, nickel, cobalt, vanadium, manganese, lead, and zinc as trace elements accompanying copper.

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