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There are three main gold deposits, Kasuga, Iwato, and Akeshi, in the Nansatsu district of southern Kyushu, Japan (Fig. 1). These three deposits have similar geologic characteristics and are the type deposits for the so-called Nansatsu- style of mineralization (Urashima, 1975), more commonly referred to these days as high-sulfidation epithermal Au mineralization (Hedenquist, 1987). This style of mineralization is believed to be a product of high-temperature acid fluids genetically related to magmatic activity at shallow depths (Matsuhisa et al., 1991; Hedenquist et al., 1994). More than 27 tons (t) of gold have been produced from these three deposits. The ore from these deposits, which is hosted by highly silicified rock, is sold to copper smelters in Japan as flux.

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