Manganese Mineral Exploration in Kulon Progo District Using Induced Polarisation Method

Kliripan and Anjir Sub-village, Kulon Progo district were known as one of big manganese mining in Java island, but a big scale mining on the surface is uneconomic anymore. Based on the geological setting, there is a chance to discover a new deposit resource in the subsurface. Therefore, manganese exploration using induced polarisation method had been done in this area. Data acquisition was obtained by utilizing Syscal Jr. with 10 – 20 meter electrode spacing, and n=6. The data was processed to delineate a prospect zone of manganese mineralisation. Resistivity and chargeability of manganese are considered in the interpretation. Mineralisation zones of manganese are clearly seen at the second and third line. From the reference, manganese minerals have a 135 – 250 msec chargeability value. On the second line, the mineralized zone is located at 65 meters above sea level and distance of 250 meters on section line. While mineralisation zone in the third line is located at 70 meters above sea level and a distance of 110 meters on the section line, both of them are at Anjir Sub-village. The mineralisation zone is guessed potential as a manganese hill associate with limestone deposit, refer to the outcrop at surface.