North Konawe Regency is an area with interesting geothermal potential to be studied. The observed geothermal potential manifestation is located in the Wawolesea area through the collection and analysis of three hot spring samples. This study aims to determine the characteristics of geothermal fluids, namely the type and origin of the fluid by conducting geochemical analysis on samples of hot springs in the study area which further shows the content of elements and chemical compounds and their respective concentrations. The analysis in this research is Inductively Coupled Plasma-Atomic Emission Spectroscopy (ICP-AES) to obtain B and Li concentrations, conductivity meter to obtain Cl concentration, visible spectroscopy method for SO4 concentration and HCO3 concentration measured by acid-base titration. The results showed that the type of hot springs in the study area was included in the Chloride type with a percentage of 81.8156%-83.3976% with a pH value of 6.7-7.4 and a hot spring temperature of 50-54°C then plotted into trilinear diagram. The Cl-Li-B Ternanry diagram shows that the source of the fluid is in a reservoir that has the same rock structure and comes from the old hydrothermal system. Based on the results of the analysis of fluid characteristics obtained from the research, it can be concluded that the hot springs of the Wawolesea Region are an indicator of the presence of geothermal sources and further research is needed on the magnitude of the geothermal potential.

Bijih besi di daerah Pakke ditemukan berupa bongkah-bongkah bijih besi magnetit dan hematit yang berasosiasi dengan intrusi granodiorit dan pegmatit granodiorit. Tujuan penelitian ini yaitu untuk mengetahui kondisi geologi, jenis batuan dan mineral pembawa bijih besi, serta karakteristik endapan bijih besi daerah penelitian. Tahapan pengambilan data berupa Pengamatan Singkapan. Pengambilan sampel litologi, menggunakan metode Rock Sampling. Metode analisis yang digunakan untuk menentukan karakatersitik endapan bijih besi yaitu analisis petrografi untuk mengetahui jenis litologi, analisis mineragrafi untuk mengetahui mineral pembawa bijih dan analisis XRD (X-Ray Diffraction) untuk mengetahui himpunan mineral alterasi dan himpunan mineral bijih. Berdasarkan tipe alterasi dan mineralisasi diketahui bahwa tipe endapan bijih besi pada daerah penelitian yaitu endapan skarn. Dimana endapan skarn ini terbentuk proses metamorfisme kontak yang bertemperatur tinggi. Magma yang kaya akan silika menginstrusi batuan sedimen yang kaya akan karbonat seperti batugamping. Jenis batuan pada daerah penelitian yaitu batuan beku berupa basal yang diindikasikan sebagai source rock dan batuan karbonat berupa wackstone yang diindikasikan sebagai host rock atau batuan penyimpan bijih besi dimana mineral pembawa bijih besi yaitu magnetit, hematit dan goetit.

Iron ore is the second most abundant metal on earth. The characteristics of this iron ore usually consist of iron ore carrier minerals associated with other minerals. One area that has iron ore prospects is the Tanjung area, Bontocani District, Bone Regency. The purpose of this study was to determine the types of iron ore carrier minerals and their associations, mineralization characteristics and paragenesis of iron ore carrier minerals. The data collection technique is carried out directly in the field by taking random samples in the field according to field conditions. Laboratory analysis uses mineragraphic analysis to determine iron ore carrier minerals and their associated minerals and X-Ray Diffraction analysis to determine iron ore carrier minerals that are not identified by mineragraphic analysis. From the results of the study found iron ore carrier minerals magnetite, goethite and hematite and their associated minerals in the form of sulfide minerals in the form of pyrite, covelite and braunite. The iron ore textures found are replacement and intergrowth textures. Paragenesis of mineral deposits formed successively are magnetite, hematite, pyrite, cuprite, braunite and goethite.

In Indonesia, gold is commonly mined from epithermal-, porphyry-, and skarn-type deposits that are commonly found in volcanic belts along island arcs or active continental margin settings. Numerous gold prospects, however, were recently discovered in association with metamorphic rocks. This paper focuses on metamorphic rock-hosted gold mineralization in Eastern Indonesia, in particular the Bombana (SE Sulawesi) and Buru Island (Maluku) prospects. At Bombana, gold-bearing quartz-veins are hosted by the Pompangeo metamorphic complex. Sheared, segmented veins vary in thickness from 2 cm to 2 m. Gold is mainly prese tripuhyite, and in places, minor arsenopyrite. The gold distribution is erratic, however, ranging from below detection limit up to 134 g/t. At least three generations of veins are identified. The first is parallel to the foliation, the second crosscuts the first generation of veins as well as the foliation, and the late-stage laminated deformed quartz-calcite vein represents the third mineralization stage. The early veins are mostly massive to crystalline, occasionally brecciated, and sigmoidal, whereas the second-stage veins are narrower than the first ones and less subjected to brecciation. Gold grades in the second-and third-stage veins are on average higher than that in the earlier veins. Microthermometric and Raman spectrometric studies of fluid inclusions indicate abundant H2O-NaCl and minor H2O-NaCl-CO2 fluids. Homogenization temperatures and salinities vary from 114 to 283 ºC and 0.35 to 9.08 wt.% NaCl eq., respectively. Crush-leach analysis of fluid inclusions suggests that the halogen fluid chemistry is not identical to sea water, magmatic or epithermal related fluids, but tends to be similar to fluids in mesothermal-type gold deposits. In Buru Island (Gunung Botak and Gogorea prospects), two distinct generations of quartz veins are identified. Early quartz veins are segmented, sigmoidal discontinuous and parallel to the foliation of the host rock. This generation of quartz veins is characterized by crystalline relatively clear quartz, and weakly mineralized with and ~1,000 m in length. Gold mineralization is intensely overprinted by argillic alteration. The mineralization-alteration zone is probably parallel to the mica schist foliation and strongly controlled by N-S or NE-SW-trending structures. Gold-bearing quartz veins are characterized by banded texture particularly following host rock foliation and sulphide banding, brecciated and rare bladed-like texture. Alteration types consist of propylitic (chlorite, calcite, sericite), argillic and carbonation represented by graphite banding and carbon flakes. Ore mineral comprises pyrite, native gold, pyrrhotite, and arsenopyrite. Cinnabar and stibnite are present in association with gold. Ore chemistry indicates that 11 out of 15 samples yielded more than 1 g/t Au, in which 6 of them graded in excess of 3 g/t Au. All high-grade samples are composed of limonite or partly contain limonitic material. This suggests the process of supergene enr...

Parigi Moutong area is known as a destination for craftsmen and small-scale gold mining to get gold grains on rock, soil and river deposits. Gold granules were found in two morphological, there are Northern Hills (MNH) - and Morphology of Southern Hills (MSH), both of these morphologies were controlled by geological structures. The morphology of Northern Hills (MNH) is composed by granite, diorite, andesite non-andesite mineralization of sulphide mineralization, the dominance of the composition of gold granules found in river deposits on the soil. The morphology of the South Hills (MSH) spreads to the terrain and beaches composed by granite, andesite, schist, gneiss, molasses, Tinombo Formation, and the dominance of gold granular concentrations found on the soil. This paper aims to differentiate geochemical characteristics of MNH and MSH on soil and gold grains obtained by panning concentrate methode of river deposit and soil, and predicts the types of primary deposits as a source of gold granules. The difference of gold association is related to the type of placer deposit, i.e the fluvial placer in the soil in the form of a residual deposit bag takes the path of weathering transport of andesite mineralization and fluvial tectonic transported zona brecciated. By normal P-P plot normality test knowing that the type of Au deposit correlates strongly with Cu compared to Pb correlated Au, and Cu increases linearly with Pb. Concentration on soil fluvial weathering and changes is higher than in soil fluvial tectonic transported. The result rotation of the Au, Cu, Pb, Zn matrix components show there are two distributions of strongly correlated variables, namely (1) Au (0.953)-Ag (0.949) and (2) Cu (0.900) -Zn (0.902). Those order correlation is a strong indication of the presence of placer deposit sources as hydrothermal deposits: 1) Au-Cu (2) Au-Zn (3) Cu-PB and (4) epithermal Au-Ag.