Characteristics of granitic igneous rocks as a source of tin mineralization in the study area are generally ilmenite granite series or commonly called Granitic S type. The occurrence of rare earth elements is relatively common in the earth’s crust. Based on its chemical properties, the occurrence of REEs (Rare Earth Element) is rarely scattered and not concentrated in one place, so it is often stated that it is not economical to be mined. However some rare earth mineral deposits such as monazite can be processed economically. Rare earth element like monazite is discovered as by-product from mining process and extracting tin mineral. The purpose of this study is to examine the separation process of tin ore that could affect the grades of tin ore produced. The highest grade of pure tin obtained rare earth element and will be optimal to the ore extraction. The methods of concentrating monazite use wet processing followed by dry concentration techniques, then extraction and refining are required. This method was observed during the study. The result showed that extraction involved sulphuric acid routes and the acidic route is the most common, dominating at least 90% of the current extraction methods.

Coal seam of the Kusan Bawah block, Warukin Formation, Asam-Asam Basin, South Kalimantan has age middle Miosen to Late Miosen. The purpose of this study is to investigate the characteristic of the coal, PAF, and NAF, the depositional environment. The method used in this research is taking rock samples from core drilling and then testing the quality of rock geochemistry by using Net Acid Generating test. Rock geochemical analysis results are entered into modeling software to determine its distribution based on stratigraphic principle. Results of rock geochemical quality analysis based on SNI 6597- 2011 to Non-Acid Forming and Potential Acid Forming. The advantages of identification PAF or NAF value are about preventive activity to decrease acidic pollutant material in the environment. Potential Acid Forming material is above seam G and is between EL and seam D. The percentage of Potential Acid Forming material is 33.17% and NAF 66.83%. The depositional environment of the Kusan Bawah block is interpreted in pro delta and transgressive conditional.

Bandung is a city with rapid industrial development and a dense population. It causes the need for clean water to be huge, so it impacts groundwater extraction on a large scale. The Bandung Basin, which is a good reservoir for groundwater, will be disturbed if conservation and monitoring efforts are not carried out in the presence of groundwater. This study focuses on reconstructing the groundwater model in the Bandung Basin using the Schlumberger geoelectric method. After taking and analyzing the data, it was found that the resistivity value of the location of the presence of groundwater is depicted into three groundwater basins, namely the Bandung-Soreang groundwater basin, the Lembang groundwater basin, and the Batujajar groundwater basin. Unfettered aquifers, relatively aquitard in nature, are in the upper layer of the coal sandstone, claystone and sandstone units. The confined aquifer in the sand unit is under the sandy claystone layer.

Prospective area of Solok geothermal lies in step over transtensional between two segments, Suliti and Siulak, Sumatra faults. Geological structure in this prospect area shows structural pattern controlled by “oblique divergent strike-slip fault system” (releasing bend) as a proceed of embraced movement from Sumatra fault and establishes “dilation zone” between those two segments, forming negative flower structure in direction of NW-SE and N-S. The pattern of geological structure is predicted to control the availability of solok geothermal system which in this case related to presence of surface manifestation. The pattern of geological structure is predicted to control the availability of solok geothermal system which in this case related to presence of surface manifestation. Surface manifestation indicates good permeability zone that can be used as flow path of geothermal fluid from reservoir.