The controls on precious metals content of massive sulfide deposits

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The research has continued according to plan during financial year 2022.New samples of volcanic rocks hosting the Kuroko ore have been collected during various short trips to the field in the Hokuroku area, around Oodate, Akita-ken. New analyses have been completed, some at Akita University, and others have been made in external laboratories.These analyses included chemical analyses of volcanic rocks, collected from the field, and ore samples, deriving from the collection of Akita University. Chemical analyses allow to understand the abundance of metals (including Zn, Pb, Cu and others) in the analysed samples. Mineral analyses of the main minerals have been completed with th instruments available at Akita University. In addition, mineral identification analyses have been completed as part of student projects. A compilation of the results available so far is currently being made. The new results will be be compared with previously published analyses.A paper on the geology of the Kuroko ore of the Hokuroku area, which reports the results of the study in the last few years, has been published recently in a international journal, as detailed below.Agangi, Manalo, Takahashi, Veeravinantanakul, Elburg, 2022. Contributions to Mineralogy and Petrology 177, 115.