peer review Analisa Potensi Kedalaman Batubesi dengan Metode Geolistrik 3D di Gunung Melati Kabupaten Tanah Laut

Abstract

Iron ore are boulders containing of iron deposition, which consists of Fe and the rest is composed by other minerals. There are 15 locations of iron ore in South Kalimantan, one of them is Gunung Melati. Iron mineralization is formed by the contact of metasomatik-sedimentary volcanic rocks, the pyroclastic rocks series. The depth’s potency of iron ore is obtained from measurements with a 3D geoelectric method of pole-pole configuration that indicate iron ore’s location in 3.20 to 10.1 m depth, and 27.1 to 63.4 m with resistivity values of iron ore which has been measured in 3167-3847 Ohm.meter and the potency of iron ore was spread unevenly in large chunks of stone. The samples test with XRD and SEM EDS is done to determine the composition and the effect of washing enrichment process. XRD test results showed the dominance of the mineral hematite (Fe2O3) of sample 1 is 75% and sample 2 at 69%. After the enrichment washing, compound’s phase turned into magnetite (Fe3O4). Sample 1 which had been washed with water was change into 77% and 83% after enrichment washing with HCl, while sample 2 were washed with water to 70%, washed with a 79% HCl. The test results with SEM EDS showed the increased levels of smoothness of surface structure and Fe’s level. Samples in sequence from start to washing with water then HCl Fe’s level is at 37.62%; 49.47% and 55.33%. The comparison of Fe content from the test results with the relative age based on stratigraphy showed that relatively older sample 1 has a Fe content greater than sample 2 relatively younger age