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Gunung Rawan is one of the boundary points along the border of Indonesia-Malaysia in Kalimantan Island (Borneo). Part of the mountain include Kedup area of Sarawak, which had been known to contain primary gold deposits. This mineralization zone is thought to be extended to the Gunung Rawan of Sanggau Regency side. In the framework of the cooperation with JMG-Malaysia, Centre for Geological Resources conducted research at Gunung Rawan in order to know the extension of mineralization zone. Lithology in the study area is generally occupied by tuff breccia that has been altered to silicification, propilitization and argillisation with mineral type of kaolinite, halloysite and muscovite containing pyrite and chalcopyrite. Correlation coeffisient analysis of Au, As, Sb and Hg elements from soil geochemical data shows positive relationship that reflecting one genesis system. Four anomaly clusters are Cu-Hg, Au-Sb-As, Hg-Sb and Cu-Au-As-Ag widely occured dominantly in the volcanic rock unit. Cluster anomaly of Cu-Hg with chalcopyrite mineralization and Au-Sb-As with pyrite mineralization are concentrated around the peak of Gunung Rawan. This mineralization is predicted to have relationship to the mineralization process occur in Kedup area. The mineralization is thougt to be epithermal volcanic-hosted type.

TIPE CEBAKAN MINERAL BERDASARKAN DATA GEOKIMIA TANAH DI GUNUNG RAWAN PERBATASAN SARAWAK - KABUPATEN SANGGAU, PROVINSI KALIMANTAN BARAT