Tembang Geology

Tembang is a large intermediate-sulphidation epithermal deposit comprising gold-silver bearing quartz veins hosted by Tertiary volcanics. The veins comprise two styles being a relatively wide and continuous set, surrounded by less regular narrower veins that can occur in both the footwall and hanging-wall, thereby describing a “halo” of mineralisation peripheral to the main veins.

The vein systems suggest that depth potential exists for higher grade shoots extending below the known vein systems, in particular below the largest vein/halo system mined to date at Berenai/Nuri.

Tembang is most likely an intermediate sulphidation epithermal vein system similar to Sumatra’s own Lebong Tandai and the Medusa’s Co-O mine complex in the Philippines. By analogy, Tembang could potentially have shoots that extend more than 200 metres down-dip.