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All Journal TEKNIK Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Jurnal Pendidikan Geografi Undiksha Geological Engineering E-Journal Journal of Geoscience, Engineering, Environment, and Technology Jurnal Geosains dan Teknologi Eksplorium : Buletin Pusat Pengembangan Bahan Galian Nuklir
Rinal Khaidar Ali
Tim Eksplorasi PT Erde Ressourcen
Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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PENENTUAN TIPE ALTERASI BERDASARKAN ANALISIS PETROGRAFI, MINERAGRAFI, DAN GEOKIMIA PADA DAERAH KASIMBAR, KABUPATEN PARIGI MOUTONG, PROVINSI SULAWESI TENGAH Salamah, Ainul Fatayatis; Aribowo, Yoga; Widiarso, Dian Agus; Ali, Rinal Khaidar
Geological Engineering E-Journal Vol 6, No 1 (2014): Volume 6, Nomor 1, Tahun 2014
Publisher : Geological Engineering E-Journal

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3228.923 KB)

Abstract

Hydrothermal alteration is a complex process, because it involves a change in mineralogy, chemistry and texture resulting from the interaction of hydrothermal solutions with rocks in its path on certain physico-chemical conditions (Pirajno, 1992). Hydrothermal processes in certain circumstances will result a collection of certain minerals known as the set of mineral or mineral assemblage (Guilbert and Park, 1986). One evidence of hydrothermal alteration is the appearance of veins that had level of metal minerals and it is also a change on the rock side, as found in Kasimbar District, Moutong Parigi Regency, Central Sulawesi province. In the area discovered the existence of gold in the alluvium sediments that are the result of weathering schist and quartz veining. Gold is found in alluvium sediments are secondary gold or placer gold. From the research that has been done, found gold in quartz veins trapped on phyllite rocks. This study was conducted to determine the lithology of the region, the study based on petrographic analysis, knowing the characteristics of the rock alteration found in the study area based on petrographic analysis mineragraphy, knowing the type of alteration that develops in the area of research, knowing mineralization contained in the study area. Research in Kasimbar District, Parigi Moutong Regency, Central Sulawesi Province was conducted by analyzing rock samples taken from the area. Analysis is conducted with the petrographic analysis, mineragraphy, lithology and geochemistry of the units located in the area.Based on the results of petrographic thin section analysis of rock samples, lithology contained in Kasimbar District, Parigi Moutong Regency, Central Sulawesi Province is phyllite, granite and gneiss. Alteration characteristics of the study area is known of the characteristics quartz veins, alteration minerals characteristics and  metal minerals characteristics. Quartz veins in the study area was divided into two, namely quartz veins in granite and quartz veins in metamorphic rocks (parallel and cut foliation). Characteristic alteration minerals contained in the study area is chlorite, sericite, biotite, epidote and quartz. Mineralization characteristics of the region, is study of sulphide minerals such as pyrite, bornite, and enargite; iron oxide minerals such as magnetite and hematite and the mineral element in the form of native gold (Au). Type of alteration is developed in the research area of prophylitic alteration, potassic alteration, silicification alteration, and carbonization alteration. Type of mineral deposits research areas is high sulfidation epithermal deposits.
Analisis Kualitas untuk Optimasi Pemanfaatan Potensi Sumber Daya Mineral Non Logam dan Batuan di Kecamatan Lumbir, Kabupaten Banyumas Ali, Rinal Khaidar; Qadaryati, Nurakhmi; Widadi, Sigit
TEKNIK Vol 40, No. 3 (2019): Desember 2019
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1119.257 KB) | DOI: 10.14710/teknik.v39i3.21889

Abstract

Kecamatan Lumbir, Kabupaten Banyumas mempunyai sumber daya mineral non logam berupa lempung dan sumber daya batuan berupa andesit dan batupasir. Analisis sebaran, jenis, dan kualitas diperlukan untuk optimasi pemanfaatan sumber daya alam tersebut. Analisis laboratorium meliputi analisis XRD (X-Ray Diffractometry), XRF (X-ray Fluoroscence) dan analisis kuat tekan batuan. Analisis XRF menunjukan lempung di daerah Lumbir mempunyai unsur SiO2 yang tinggi (berkisar antara 39 – 54,5 %) sehingga dapat dijadikan bahan campuran dalam pembuatan semen, gerabah kasar, dan batu bata. Sumber daya batuan berupa andesit di Desa Canduk dan Desa Parung Kamal memiliki nilai Kuat Tekan Ultimit (qu) berkisar antara 247,7547 kg/cm2 - 45,4674 kg/cm2, sehingga dapat digunakan sebagai batu hias dan batupasir di Desa Karanggayam dapat dijadikan tanah urug
Potensi Pembentukan Air Asam Tambang Pada PIT 3000, Blok Toraja, PT Trubaindo Coal Mining Berdasarkan Studi Karakteristik Geokimia dan Mineralogi Batuan Overburden dan Underburden Winarno, Tri; Ali, Rinal Khaidar; Langit, Wesly Rambu
Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Vol 17, No 1 (2020): Maret 2020
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1218.146 KB) | DOI: 10.14710/presipitasi.v17i1.52-61

Abstract

Penambangan batubara di Indonesia kebanyakan dilakukan dengan sistem tambang terbuka, yang menyebabkan batuan yang ada pada lokasi penambangan tersingkap ke permukaan, sehingga mudah bereaksi dengan udara dan air. Tingginya kandungan mineral sulfida seperti pirit dan markasit pada lokasi pertambangan batubara, berpotensi menghasilkan asam tambang. Air asam tambang dapat menyebabkan terjadinya pencemaran lingkungan yang menjadi ancaman bagi ekosistem air dan tanah dengan meningkatkan konsentrasi logam berat. Penelitian ini bertujuan untuk mengidentifikasi kandungan mineral pada lapisan batuan overburden dan untuk mendeterminasi jenis mineral sulfida pembentuk asam tambang. Metode yang digunakan adalah penyelidikan lapangan, analisis mineralogi, geokimia dan pengukuran stratigrafi terukur untuk mengevaluasi kandungan mineralogi dan karakteristik geokimia pada batuan overburden dan underburden lapisan batubara Pit 3000. Hasil penelitian menunjukkan bahwa batuan overburden tersusun oleh batulempung dengan ketebalan berkisar 1,60 m – 5,15 m, sedangkan batuan underburden dicirikan oleh litologi yang beragam seperti batulempung, batulanau dan batupasir dengan ketebalan berkisar 0,20 m – 4,50 m. Berdasarkan analisis geokimia pada 18 sampel batuan overburden, diketahui bahwa lapisan overburden memiliki karakteristik yang didominasi oleh batuan Non Acid Forming (NAF) dengan 83% NAF, 11% Potential Acid Forming (PAF) dan 6% uncertain. Karakteristik lapisan underburden didominasi oleh batuan PAF dengan 45% PAF, 19% NAF dan 36% uncertain.
Strategi Pengembangan Obyek Wisata Pantai di Kecamatan Sluke, Kabupaten Rembang, Jawa Tengah Ali, Rinal Khaidar
Jurnal Pendidikan Geografi Undiksha Vol 9, No 3 (2021): Jurnal Pendidikan Geografi Undiksha
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jjpg.v9i3.37546

Abstract

Kabupaten Rembang berbatasan langsung dengan Laut Jawa di bagian utara. Hal ini menjadikan Kabupaten Rembang banyak memiliki obyek wisata pantai. Kecamatan Sluke sebagai salah satu kecamatan di Kabupaten Rembang memiliki obyek wisata pantai yaitu Pantai Jatisari dan Pantai Sluke.  Penelitian ini bertujuan untuk menganalisis faktor  kekuatan, kelemahan, peluang dan ancaman sehingga menghasilkan strategi pengembangan obyek wisata pantai di Kabupaten Rembang. Penelitian ini dilakukan dengan beberapa metode, diantaranya adalah metode penilaian langsung dilapangan dan melakukan analisis SWOT (Strenghts Weakness Opportunities Threats). Elemen yang menjadi dasar analisis SWOT secara garis besar antara lain berupa (1) Kekuatan yang berasal dari aspek keindahan dari obyek wisata pantai, (2) Peluang berasal dari minat wisatawan terhadap obyek wisata pantai dan adanya dukungan masyarakat guna mengembangkan obyek wisata, (3) Kelemahan berupa kurangnya fasilitas pendukung dan (4) Ancaman berupa turunnya daya dukung lingkungan dan faktor kebencanaan. Secara garis besar strategi untuk mengembangkan obyek wisata pantai  di daerah penelitian lain (1) melakukan promosi (2) pembangunan sarana dan prasarana, (3) melakukan kerjasama (4) membangun wahana bermain, (5) menampilkan atraksi dan kuliner lokal, (6) mitigasi bencana dan (7) memelihara dan menjaga kelestarian lingkungan. Strategi pengembangan yang telah disusun diharapkan mampu menjadi acuan guna mengembangkan potensi obyek wisata pantai di Kecamatan Sluke Kabupaten Rembang.
Provenance Analysis Based On Petrographic Samples On EXIA-1 Well, Banggai Basin, East Sulawesi, Indonesia Setyawan, Reddy; Aribowo, Yoga; Kurniasih, Anis; Fahrudin; Ali, Rinal Khaidar; Najib; Ferdy; Wijaya, Ennur Kusuma; Qadaryati, Nurakhmi; Khorniawan, Wahyu Budhi; Dalimunte, Hasnan Luthfi; Ringga, Anita Galih
Journal of Geoscience, Engineering, Environment, and Technology Vol. 9 No. 2 (2024): JGEET Vol 09 No 02 : June (2024)
Publisher : UIR PRESS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25299/jgeet.2024.9.2.13367

Abstract

The structure of Exia is composed of Miocene built-up carbonates formed by shear faults. The buildup carbonate feature in the Exia prospect can be seen from the high elevation surrounded by lows with an NNE-SSW and NE-SW trending. The MA-1, SE-1, MI-1 wells are several wells in the Tiaka and Senoro Fields which are proven to have large gas reserves. Tiaka Field is located to the west of the Exia Well, while Senoro Field is to the northeast. The study used primary data from the Exia-1 well in the form of cutting samples. The wet and dry cutting samples were further processed into thin section. This thin section is then carried out for petrographic, XRD, and SEM analysis. Tomori Formation starts from the deeper environment FZ1 upwards to the shallower FZ5 –FZ6 (reef) with open marine and restricted areas. The allochem that composes the limestone at The Matindok Formation consists of red algae fragments and benthic forams which indicate the facies zone of formation in FZ 4 (slope). In the upper Mantawa Formation, it is still quite clear the presence of large forams indicating a reef association environment (FZ5-FZ6), but the presence of a large number of planktonic forams indicates a deeper depositional environment / slope, so it is possible that large forams were transported from a shallower environment. The Kintom Formation have rock provenance ranging from continental blocks in the interior of the craton to a recycled orogeny section of recycled quartz zone.
Analisis Karakteristik Reservoir dan Perhitungan Volumetrik Cadangan Gas Bumi pada Prospek Reservoir Formasi Meliat, Lapangan ARB Job Pertamina-Medco E&P Simenggaris Abdurrahman, Rais Brian; Setyawan, Reddy; Ali, Rinal Khaidar
Jurnal Geosains dan Teknologi Vol 7, No 2 (2024): Oktober 2024
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jgt.7.2.2024.123-134

Abstract

Lokasi penelitian berada di Lapangan ARB, Cekungan Tarakan Pulau Kalimantan yang memiliki 4 sumur eksplorasi dan produksi. Cekungan Tarakan termasuk lingkungan pengendapan berasal dari delta plain. Target reservoir berada pada Formasi Meliat yang memiliki prospek hidrkarbon sehingga menarik mengevaluasi karakteristik reservoir. Tujuan penelitan ini mengidentifikasi zona prospek hidrokarbon pada Formasi Meliat menggunakan metode analisis kualitatif dan kuantitatif, serta mengetahui estimasi jumlah cadangan gas menggunakan metode volumetrik. Berdasarkan analisis elektrofasies dan data core Formasi Meliat terbentuk pada distributary channel bagian dari delta plain. Berdasarkan analisis kualitatif dapat diketahui bahwa litologi daerah penelitian adalah batupasir dolomit, serpih, batubara, dan diidentifikasi terdapat 21 reservoir dengan jenis fluida berupa air dan gas pada lokasi penelitian. Berdasarkan analisis kuantitatif diketahui nilai cut-off yang digunakan meliputi PHIE>0,084 V/V, Sw<0,7 V/V dan Vsh<0,412 V/V, sehingga berdasarkan nilai tersebut dapat diidentifikasi 3 prospek reservoir hidrokarbon pada lokasi penelitian. Berdasarkan analisis perhitungan volumetrik didapatkan reservoir RBA-12 menghasilkan cadangan gas sebesar 12,7 MMSCF/d, reservoir RBA-34 menghasilkan cadangan gas sebesar 4,58 MMSCF/d, reservoir RBA-24 menghasilkan cadangan gas sebesar 5,3 MMSCF/d. Cadangan gas paling besar terdapat pada reservoir RBA-12 dikarenakan karakteristik reservoir dan lingkungan pengendapan pada reservoir tersebut mendukung untuk terakumulasinya gas secara maksimal.
Hubungan Ukuran Butir Terhadap Kadar Nikel pada Zona Saprolit Endapan Nikel Laterit Site Moronopo, Kabupaten Halmahera Timur, Maluku Utara Winarno, Tri; Ali, Rinal Khaidar; Komala, Resa
TEKNIK Vol. 43, No. 1 (2022): May 2022
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/teknik.v43i1.40277

Abstract

The research was conducted at the Dinding A and Dinding B, Moronopo Site PT Antam Tbk, East Halmahera, North Maluku which is a block that has been opened for the mining process. Generally the stratigraphy of laterite nickel deposits, from top (young) to bottom (old) consists of overburden, limonite, saprolite and bedrock. The saprolite zone is an economical ore layer for Ni content. This research aims to determine the relationship between grain size of ore and the mineralogy and economical Ni content. The research methods used include the grain size fractionation method with sizes of -5 cm, +5 cm, +10 cm, +15 cm, +20 cm and +25 cm, and XRF analysis to determine the Ni content. The result of this study shows the rocks in the saprolite zone containing minerals such as olivine, serpentine, garnierite and chrysoprase. The XRF analysis result shows the highest Ni content is found in the finest grain fraction (-5 cm) i.e. 2.4% and the lowest Ni content found in the coarsest grain fraction (+25 cm) i.e. 1.87 % but  is still classified as economic.
Karakteristik Alterasi dan Mineralisasi Tipe Epitermal Daerah Gunung Budheg dan Sekitarnya, Tulungagung, Jawa Timur Ali, Rinal Khaidar; Winarno, Tri; Jamalulail, Muhammad Ainurrofiq
EKSPLORIUM Vol. 41 No. 1 (2020): MEI 2020
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/eksplorium.2020.41.1.5676

Abstract

The discovery of vuggy quartz boulders around Pojok Village, Gunung Budheg area, Tulungagung, East Java, indicates the presence of mineral deposits process in this area. This study aims to discuss detailed characteristics of alteration and mineralization as well as mineral deposits type in the study area. The research methods are field observations completed with petrography, X-ray Diffraction (XRD), and mineragraphy laboratory analysis. The rock unit in the study area consists of six lithology units, a dacitic intrusion, andesitic lava, andesitic breccia, poly-mix breccia, reef limestone, and alluvium. The study area's alteration types are profilitic alteration, argillic alteration, advanced argillic, and silicification alteration. The profilitic alteration characterized by the abundance of chlorite minerals. The argillic alteration characterized by the abundance of kaolin minerals, while the advanced argillic alteration by the presence of kaolinite and alunite minerals. The silicification alteration characterized by abundance quartz minerals. The metallic minerals dominated in the area are sulfide minerals such as covellite, chalcocite, enargite, chalcopyrite, pyrite, and jarosite. The native gold found in an association with enargite. The study area's mineral deposit system is an epithermal high sulfidation system characterized by mineralized vuggy quartz and the presence of kaolinite mineral as an alteration mineral.
Co-Authors Abdurrahman, Rais Brian Ainul Fatayatis Salamah Dalimunte, Hasnan Luthfi fahrudin Ferdy Jamalulail, Muhammad Ainurrofiq Komala, Resa Kurniasih, Anis Langit, Wesly Rambu Najib Qadaryati, Nurakhmi Ringga, Anita Galih Setyawan, Reddy Tri Winarno Wahyu Budhi Khorniawan Widadi, Sigit Widiarso Dian Agus Wijaya, Ennur Kusuma Yoga Aribowo