Abstract

On the basis of the Cu:Zn:Pb ratios, the Tsunokakezawa no. 1 orebody is classified as a ‘B’ (black) Kuroko ore sub-type. With the exception of zirconium the distribution of base metals and certain trace elements through the stratigraphy of the orebody is as expected in Kuroko deposits. Zirconium shows its highest concentration in the barite zone, which can be accounted for by lower flow rates of hydrothermal fluid during barite formation compared to those during massive sulfide ore formation.

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