Coal is a non-renewable natural resource. Coal has an important role in domestic and foreign energy resources. Coal is generally used in steam power plants (PLTU). In supporting the sustainability of coal energy, further exploration in coal development is needed. The research uses the required structural contour method with the aim of determining the distribution limits and direction of the continuity of the coal seam and only refers to the position of the coal seam and is applied to topographic maps. The observation location (LP) found in the research area contained 7 coal seams. Based on the criteria of the Indonesian National Standard (SNI), the number of outcrops that have a coal seam thickness above 1 meter are 2 outcrops with a thickness of 2.15 meters and 1.24 meters, respectively. The results of drawing the distribution pattern using the structural contour method based on the bottom of the coal seam, it is found that the direction of the distribution pattern is northwest-southeast. The continuity follows the direction of the hills and valleys based on a distribution pattern that is trending northwest-southeast with a developed control structure in the form of a pure rising fault. This is in accordance with the regional geological map of the study area with the direction of the continuity of the coal seam trending northwest-southeast. From the results of the distribution pattern and continuity, there are 2 coal outcrops that can be exploited with economic value.

Jambi Sub-basin is a sedimentary back-arc basin in Sumatra with the numerous geodynamic processes of the extensional basin. It is a prospect and producer of hydrocarbon Sumatra, Indonesia, and it's part of the South Sumatra Basin. The presence of trachy basaltic lava on the Sabak (Jambi Sub-basin), Tanjabtim, guides back-arc volcanism. Geragai geothermal features are the Northwestern part of Sabak back-arc volcanic as a hint of the connection between both of them. The geological investigation of geodynamics is essential for understanding the possibility between Sabak Back Arc Volcanic and Geragai Geothermal Features. Geological methods research consists of geological outcrop data such as lithology characteristics, the structural geology element, the physical part of geothermal manifestation, and mineral composition analyzed. Geological evidence of the Sabak Back Arc Volcanic compile of trachy basaltic lava is scoria, vesicular, amygdaloidal, and rophy structure. These are perpendicular that magma eruption, which extrusive processes. A geological survey to show Geragai geothermal features is composed of hot springs with temperatures about 50ºC -55ºC, pH 6.2 -6.8, the appearance of Claystone Kasai Formation, and swamp sediment. Bicarbonate fluid indicates a strong influence of meteoric water and mixing processes of the interaction fluid geothermal with wall rock and thickness of water table. The existence of dextral fault with Northwestern -Southeastern orientation of Sabak Back Arc Volcanic the continued to Geragai geothermal hot spring manifestation, were buried under Alluvium. The dextral mark directly continues to appearance geothermal features manifestation. It assures there is a facility of the pathway the geothermal features on the surface manifestation. The geothermal system on Geragai has a spatial connection to back-arc volcanism on Sabak. The convinced heat transfer dormant volcanic of Sabak Back Arc Volcanic to Geragai geothermal features passes through dextral fault system.

Penelitian ini dilakukan di PT Keritang Buana Mining yang berada di wilayah Izin Usaha Pertambangan (IUP) Desa Keritang Kecamatan Kemuning Kabupaten Indragiri Hilir Provinsi Riau. Tujuan penelitian ini yakni untuk mengetahui penyebaran cadangan batubara dan merancang desain pit di daerah potensial untuk ditambang. Beberapa parameter dalam perancangan pit tambang adalah penentuan batas akhir tambang, bentuk design pit, design bench (jenjang) serta penentuan cadangan batubara. Perancangan pit dilakukan di blok baru yakni Blok I seluas 54 Ha dari luas keseluruhan Wilayah Izin Usaha Pertambangan (WIUP) yakni 974,04 Ha dengan penyebaran batubara dari barat laut ke tenggara. Berdasarkan hasil pemodelan sebaran batubara ditemukan 1 seam batubara yakni seam S2 dengan ketebalan 1-1,2 meter. Berdasarkan rekomendasi studi geoteknik yang dilakukan oleh PT Keritang Buana Mining dalam perancangan pit batubara parameter geometri jenjang yang direncanakan  yakni lebar jenjang 5 meter dan tinggi jenjang 10 meter dengan kemiringan high wall 60° dan low wall 45°. Di lokasi penelitian dilakukan perhitungan cadangan dengan membagi luas potensial area tambang menjadi blok-blok dengan ukuran 50 meter x 50 meter untuk setiap blok dengan metode blockstrip menggunakan perangkat lunak simulasi tambang. Berdasarkan hasil perhitungan cadangan pada seam S2 didapatkan cadangan batubara 232.765,5 MT dan volume overburden 3.042.710,2 bcm dengan stripping ratio 13. Hasil yang didapatkan dalam perancangan pit ini sangat dibutuhkan dalam implementasi di lapangan guna dilakukannya penambangan batubara yang optimal berdasarkan parameter teknis dan geoteknik. Dengan volume cadangan yang akan ditambang 232.765,7 MT dengan stripping ratio 13:1 bisa dilakukan penambangan dikarenakan kualitas batubara didaerah penelitian termasuk kualitas batubara tinggi.