TINJAUAN EMAS EPITERMAL PADA LINGKUNGAN VOLKANIK

Epithermal gold deposits in volcanic terranes are mostly associated with calc-alkaline volcanic and intrusive rocks, some show a close association with alkalic volcanics. Epithermal gold deposits are highly variable in form, ranging from thin quartz veins to large dissemineted deposits, and are located in a variety of geological environments. Consequently, they exhibit a wide range of geochemical and geophysical signatures, as well as tonal characteristics of remote sensing. In Kelian, the deposit is associated with Late Oligocene-Early Miocene andesite, Upper Eocene (?) pyroclastics and minor rhyolites, and some Plio-Pleistocene basalt. It lies on a north-easterly regional trend which also contains significant epithermal mineralization at Mt. Muro and Masuparia. Mineralisation occurs in the margin of andesite intrusive, into the Eocene pyroclastic unit, and hosted by fractured endesit, and tuff and a variety of breccias.