Jyozankei hot spring located near Sapporo City in Hokkaido is famous for many visitors and hot spring quality in Japan. Ground temperatures of 220 °C were reached in the Toyoha Mine10 km west of Jyozankei hot spring where several boreholes less than 2000 m in depth for investigating geothermal water were drilled. Subsequently, a hydrological investigation to clarify the influence of geothermal development on Jyozankei hot Spring was performed. Snow, river, well, spring, hot spring and the geothermal borehole waters in the Toyohirakawa catchment including Jyozankei hot spring were sampled and oxygen and hydrogen stable isotopes of water were analyzed to determine water origin for hot spring and geothermal water. As a result, Jyozankei hot spring and the borehole waters were thought to arise from mixed waters of magmatic and surface waters. Borehole water, from less than 2000 m in depth, was 10 to 30 % of the magmatic water and Jyozankei hot spring water was less than 10 % of the magmatic water. Surface water was recharged at the upstream of the Toyohirakawa catchment, with snow from the upper stream of the northwest catchment being an important resource of surface water for both Jyozankei hot spring water and geothermal water from the boreholes.

Carrollite, meneghinite and bournonite are rare minerals in the Kuroko deposits, and occur in very restricted parts of the uppermost part of the black ore zone. Carrollite is found exclusively in a chalcopyrite rich part of the black ore of the Matsumine ore deposit of the Hanaoka mine. The mineral is intimately associated with chalcopyrite, bornite and pyrite and also with sphalerite (0.2-0.3 wt% Fe), tennantite, galena and barite.