Trace element determinations on pyrite, pyrrhotite and chalcopyrite from magmatic Ni ores, and hydrothermal Cu and Au ores indicate that 1) certain elements, especially Co and Ag, and to a lesser extent Ni and Pb, show a preferential concentration in the 3 sulfides; 2) that some significant variations occur in deposits of different type and in different deposits of similar type; and 3) that there is a striking qualitative similarity in trace elements of all the deposits. Possible interpretations are given. These favor magmatic sources for the ores and suggest local contamination of rising ore fluids as a cause of some of the variations.

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