Perpustakaan Digital ITB

The River Reef Zone is one of mineralization sites outlined in the Poboya Gold Deposit. A previous work suggested that the deposit is classified as a low-sulfidation epithermal deposit. However, characterization of the gold mineralization and its origin still encounters some problematic difficulties. One of the ways to solve them is conducting an investigation on the quartz veins and host rocks. An attempt through petrographic analysis has been carried out to obtain information about the mineralization style. As the results, several rocks were recognized as the host rocks at this zone. Sorted from the surface, the host rocks consist of granitic rocks, biotite-chlorite gneiss, biotite schist intercalated by feldspar porphyroblasts biotite-chlorite schist, and amphibolitic schist. These rocks are cut by various scale of veins composed of quartz-carbonate, quartz, carbonate and quartz-epidote. In order to deepen the understanding on the quartz veins and host rocks, further analyses needs to be done.