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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA Journal of Aquatropica Asia PROMINE Logista: Jurnal Ilmiah Pengabdian Kepada Masyarakat Jambura Geoscience Review Jurnal Abdi Insani Jurnal Himasapta Jurnal Riset Kelautan Tropis (Journal Of Tropical Marine Research) (J-Tropimar) Journal of Applied Geology MINERAL Jurnal Riset Kelautan Tropis (J-Tropimar)

Irvani, Irvani

Jurusan Teknik Pertambangan, Fakultas Sains Dan Teknik, Universitas Bangka Belitung

Author-ID : 784707

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics

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Studi Unsur Radioaktif Thorium (Th) dan Uranium (U) di Pulau Bangka Irvani Irvani; Janiar Pitulima
PROMINE Vol 5 No 2 (2017): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

As one of the island that producing tin ore mineral (cassiterite), Bangka Island has probably a bigpotential of tin associated mineral that contains radioactive elements like Thorium (Th) and Uranium(U). Th and U can be one of potential future prospect elements expecially for nuclear energy. Th andU elements bearing minerals in Bangka Island not yet exploited. They take out from the tin ore miningand becoming tailing, and then through the surface water flows or shallow sea water as sediment. Thestudy goal is to getting the number of radioactive Th and U elements using surface sediment sampleand then interpretation some part of their spatial distribution form. The Surface sediment data hasbeen collected on 2 sites Kolong in Muntok District West Bangka Regency, 3 sites in MerawangDistrict Bangka Regency, 9 sites in Pangkalpinang City, 2 sites in Central Bangka Regency and 2sites in South Bangka Regency. Chemistry analysis of sediments for identification the presence of Thand U elements. Radioactive element of Uranium (U) almost presence at all shallow surfacesediment 4.842 - 229.2 ppm except nul in 1 sample. Thorium (Th) just presence in a part of sedimentsample. One site as especially case study Kacang Pedang Retention Ponds, shows Th and Uradioactive elements has the heterogenity spatial pattern.

Studi Karakteristik Tailing Pada Lokasi Eks Penambangan Timah di Bukit Sambung Giri Kecamatan Merawang Kabupaten Bangka Irvani Irvani; Elsha Delvi Artasari
PROMINE Vol 6 No 2 (2018): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Tailing deposits at the ex-tin mining area in Bangka and Belitung Island has a large number of economical residual minerals. This study is to identify tailing characteristic and its potential mineralogy and elements based on shallow hand boring (Auger) samples, along streamline in the west part of Sambung Giri Hill. Every coordinate sample plotted on the base map. Laboratory analysis using Stereo Microscope for identifying mineral characteristics, and geochemical analysis using XRF for identification of the presence of elements. The tailing deposits has laterally grain size gradation to downstream, composed above 94% sand fraction, and a small amount of shale and granule fraction. Quartz mineral presence more than 90%, followed by iron oxide (hematite), clay, zircon, cassiterite, ilmenite, monazite and tourmaline minerals, showed low consistency in lateral spatial except quartz, with its Rare Earth Elementh (REE) composition is Cerium (Ce), Lanthanum (La), Yttrium (Y), Neodymium (Nd) and Samarium (Sm).

DETERMINATION OF NUCLEAR POWER PLANT SITE IN WEST BANGKA BASED ON ROCK MASS RATING AND GEOLOGICAL STRENGTH INDEX Irvani Irvani; Wahyu Wilopo; Dwikorita Karnawati
Journal of Applied Geology Vol 5, No 2 (2013)
Publisher : Geological Engineering Department Universitas Gadjah Mada

Indonesian government through the National Atomic Energy Agency has planned to build a nuclear power plant. One of the proposed sites is in West Bangka Regency, Bangka Belitung Archipelago Province. The engineering geology of this area is, however, not fully understood and requires further investigations. Engineering geology investigations were carried out by assessing the rock mass quality and bearing capacity based on field observation and drilling data. The assessment was conducted using Rock Mass Rating (RMR) and Geological Strength Index (GSI) classification. The rock mass in the study area was divided into four units, namely Units of Sandstone, Granite, Mudstone and Pebbly Sandstone. The RMR and GSI values in the study area are influenced by the parameters of discontinuity space density, the slope of discontinuity orientation, grade of weathering and groundwater conditions. The assessment shows that the Granite Unit has the best quality which is shown by the average RMR value of 53 and GSI value of 66. Based on the average RMR value, the Granite Unit is estimated to have cohesion value between 0.2 and 0.3 MPa, friction angle between 25° and 35°, and allowable bearing pressure between 280 and 135 T/m2. Based on the GSI value, the Granite Unit is estimated to have uniaxial compressive strength value between 1.0465 and 183.8 MPa, tensile strength between (-0.0122) and (-5.2625) MPa, rock mass strength values between 24.5244 and 220.351 MPa, and modulus of deformation within a range of 1.73–86.68 GPa. The Granite Unit is considered to be the most appropriate location for the nuclear power plants. Keywords: Nuclear power plant foundation, geological strength index, rock mass rating, rock mass quality

PEMBANGUNAN PROTOTIPE SUMUR RESAPAN DI KAWASAN PERUMAHAN PADAT PENDUDUK KOTA PANGKALPINANG Roby Hambali; Yayuk Apriyanti; Irvani
Jurnal Abdi Insani Vol 8 No 2 (2021): Jurnal Abdi Insani
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/abdiinsani.v8i2.406

Pembangunan perumahan secara intensif yang dilakukan di Kota Pangkalpinang dengan kondisi yang minim ruang terbuka hijau menyebabkan tingginya limpasan permukaan pada musim hujan, dan berkurangnya pengisian cadangan air tanah. Hal tersebut menyebabkan terjadinya bencana banjir. Selain itu, rendahnya pengisian cadangan air tanah juga dapat menyebabkan kekeringan di musim kemarau. Kegiatan pengabdian kepada masyarakat ini bertujuan untuk menyebarluaskan pengetahun tentang konsep tata kelola air yang baik dengan sistem drainase berwawasan lingkungan. Program ini terdiri dari dua kegiatan utama, yaitu sosialisasi dan pembuatan contoh implementasi teknologi konservasi air. Sosialisasi materi kegiatan dilakukan melalui penyebaran poster, sementara pembuatan contoh implementasi teknologi konservasi air dilakukan dengan pembangunan prototipe sumur resapan. Capaian telah didapatkan melalui kegiatan ini antara lain meningkatnya pengetahuan masyarakat setempat tentang konsep tata kelola air hujan berwawasan lingkungan, serta terbangunnya prototipe sumur resapan di tiga titik dalam Kawasan perumahan sebagai contoh aplikasi teknologi konservasi air hujan. Namun demikian, capaian dalam bentuk partisipasi aktif masyarakat secara langsung belum tercapai, karena adanya pembatasan fisik dalam situasi pandemi Covid-19

Pengaruh Pengurangan Setting Time (Wait on Cement) pada Semen Tahan Api dengan Penambahan Oil Well Cement Bayu Rahmadika; Yayuk Apriyanti; Irvani Irvani
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Underground Coal Gasification (UCG) is a technology to extract coal deposits in the form of gas from mineral deposit without disassembling of overburden. There are some initial processes in UCG, one of them is cementing to glue the casing into the formation. This research-based laboratory using cement mixture that consists of Fire Mortar as the main ingredients with added Oil Well Cement (OWC) by 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5% and 60% of the total weight of the cement mixture. Cement samples were then tested with hydration heat test, furnace test at temperatures of 300°C to 900°C and UCS test of a sample at normal temperature as well as samples that have undergone combustion at a certain temperature. Composition of OWC>50% have faster setting time on the 29th to 40th hours with maximum hydration temperature of 34.4°C on the 11th to the 12th hour as well as getting the optimal composition of Fire Mortar which is 42.5% and OWC which is 57.5%. Composition of 50-60% Fire Mortar have a heat resistance to a maximum of 900°C so they don’t experience failure and cracks which make a sample split. Ofter than that, composition of 50-60% OWC on average have a greater compressive strength with the highest compressive strength value of 1.75 MPa at a temperature of 500°C.

Perencanaan Tambang Secara Manual dan Software Micromine Sebagai Pembanding Pada Kapal Keruk 21 Singkep 1 Di Laut Air Kantung, PT Timah (Persero) Tbk Elisa Elisa; Irvani Irvani; Janiar Pitulima
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Dredger 21 Singkep 1 is a mean of production offshore tin mining owned PT Timah (Persero) Tbk, which in 2016 is located in the Air Kantung Sea. Before the implementation of the necessary mining mine planning as a guide to provide an overview of work in the field conditions. Mine planning studies considering the economical extraction and analysis of the operations of dredgers by applying two ways; manually which reserves calculations using the Poligon Methods (Area Of Influence) with sea drilling spacing of 100 × 100 m and assisted Software Micromine as a comparasion. Based in the calculation, the value of the break even production of 42 tonnes ore/month and the break even grade of 0,23 kg/m3. Mining in May to October 2017 to continue the old location to the position of excavation to the northwest. Results obtained Idh manual production planning (Content Calculated) 1.263.980 m3, TDH (Tin Calculated) 0,292 kg/m3 and PDH (Production Calculated) 369,69 tonnes, while the calculation of Micromine obtained Idh 1.271.379 m3, Tdh 0,273 kg/m3 and Pdh 347 tonnes. Fault tolerance value 0,58%. Repair manual planning the excavation efficiency is obtained Idh 1.283.847 m3 increased 1,55%, Tdh 0,327 kg/m3 increased 10,7% and Pdh 409,37 tonnes increased 11,85%. Based on the analysis of drill profiles, the most effective method of extracting using combination system, where the overburden excavation with long face method and leaded soil with short face method.

APLIKASI SOFTWARE GEOSTUDIO 2007 SLOPE/WUNTUK ANALISIS KESTABILAN LERENG DI TAMBANG MUARA TIGA BESAR UTARA PT BUKIT ASAM (PERSERO) Tbk SUMATERA SELATAN Irza Tri Putra; Guskarnali Guskarnali; Irvani Irvani
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Bukit Asam (Persero) Tbk is one of the State Owned Enterprises engaged in coal mining. Presente of Mine Muara slopes at Muara Tiga Besar Utara would be harmful to workers and the mechanical vehicle, because the soil/ rock is likely to experience landslides or falling. This study was conducted to determine the value of slope safety factor RKAP 2017 and redesign the slopes with a safe condition. The data used in this study include the value of cohesion (c’) the angle of friction (ϕ’) and density (γ). Retrieval of research data obtained from the test results did not drainage unconsolidated triaxial (UU) and test weight of soil/rock with Paraffin Wax Method, and then did the processing of data by using Software Geostudio 2007 Slope/w to determine the value of the safety factor of the slope. Factors affecting slope instability in Mine Muara Tiga Besar Utara were the geometry of the slope, weather/climate, vibration, and physical properties and mechanics of soil/rock composed of the density (γ), ie 1.203 to 2.025 gr/cm3, the value of cohesion (c’), which is 34 to 266 kPa and the shear angle value (ϕ’), ie 17.65 to 35.210. The results of slope stability analysis indicate that the value of slope safety factor RKAP 2017 was below 1.25, so the potential occurrence of landslides, while the redesign slope slope with the security condition had a value of safety factor is above 1.25, so that no potential landslides.

Pendugaan Potensial Penyebaran Mineralisasi Sumberdaya Timah Primer Menggunakan Metode Geomagnetik Pada Wilayah IUP PT TIMAH (Persero) Tbk Di Desa Pengarem Kecamatan Tukak Sadai Kabupaten Bangka Selatan Teo Aldino; Guskarnali Guskarnali; Irvani Irvani
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Exploration is a phase before mining activity which is to know, estimate, and attain the measurement, shape, position, average ore content, and also the amount of minerals reserved sediment which are to know economic value. Based on the discovered outcrop, IUP PT TIMAH (Persero) Tbk located in Pengarem Village, Tukak Sadai District, South Bangka it is allegedly has potential source of cassiterite reserved sediment . in case to know the potential zone of source and the spread direction , it is needed to do exploration, one of it is by using geomagnetic method. By using 2 units of magnetometer tool along with base magnetometer application and mobile magnetometer to read (suseptibility) stones magnetic and minerals under the surface. The number of reading lines is 17, distance of the reading point is 10 m, with the number of reading point is 1587, the length of lines is 59 m. Based on the result of reading the geomagnetic method in Pengarem Village with IGRF value is 43204,2 inclination corners -23,493 declination 0,616 which are already corrected by Oasis Montaj V6.4.2 software owns variety value of suseptibility. The highest value is 52,1 nT and the lowest is -36,2 nT. The magnetic anomali contour map that is produced shows that there are potential zone and spread direction of cassiterite source from southwest to northeast. Analysis and conclusion based on geology data.

KajianTeknis Pengaruh Panjang Pukulan Terhadap Recovery Pencucian Bijih Timah Menggunakan Alat Pan American Jig Skala Laboratorium Jurusan Teknik Pertambangan Universitas Bangka Belitung Adiyatma Adiyatma; Janiar Pitulima; Irvani Irvani
MINERAL Vol 3 No 1 (2018): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Washing stage of tin ore is done the separation process valuable minerals of tin ore with mineral impurities. This process can be done using jig such as Pan American Jig. The length of stroke is one of the parameters that affect the performance of the jig with high recovery of tin ore leaching. The experiment was carried out by washing experiment using Pan American Jig scale laboratory on 6 times including variation of stroke length 15 mm, 12 mm, 10 mm, 8 mm, 6 mm, and 5 mm with 19 washing sample. The collection and processing of data includes the weight and grade in each of the feed, concentrates and tailings. Determination of recovery value of each experiment is done through calculation between the grade and weight produced by each sample from washing process. Minerals with a high CC value will be very easily separated by the method of Gravity Concentration for example mineral cassiterite with quartz. The highest recovery was obtained in experiment 1 of 68.848% with a stroke length of 15 mm and the lowest recovery was in experiment 6 of 45.801%. However, the highest grade gain was in experiment 6 of 1.3246% and the lowest grade in experiment 1 was 1.2438%. The higher stroke length made greater recovery value produced, the greater recovery made the lower grade obtained.

Analisa Kestabilan Lereng Menggunakan Metode Fellenius Secara Manual dan Software Slide Rocscience 6.0 (Studi Kasus : TB 1.42 Pemali PT Timah (Persero) Tbk Damos Tiambunan; Irvani Irvani; Ferra Fahraini
MINERAL Vol 3 No 1 (2018): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

A hill slope is a part of a mining, especially mining by Open Pit Method. The TB 1.42 Pemali PT Timah (Persero)Tbk, which is often referred as the TB 1.42 applies the open it method in its mining, hence the condition of the hill slope greatly influences the mining Safety because hill slope instability can cause avalance. Hance, the hill slope stability has to be calculated.The calculation is performed to get the value of the safety factor (FK) and to understand the slope’s condition. This calculation can be done using yheFelleniusMethod, either manually or using,SoftwareSlideRocscience 6.0. The FelleniusMethod requires the shear strength parameter in the calculation, therefore a laboratory testing is performed using direct shear test ASTM D-3064-04. This test generates the value of cohesion (c),the angle of internal friction (ɸ) and the soil density (γ) of a soil sample taken from the field.Basedon the research the front south slope TB 1.42 Pemali have sandy loam lithology (Slope LT01), clay (Slope LT02 dan LT03), and gravelly clay (slope LT04). Based on the Fellenius Method, the value of FK for the slope is affected by the slope’s angle and shear strength parameter ( c and ɸ). The analysis conducted in this study showed that of the four slopes that are observed, there are two unstable slopes, which are slope LT02 with FK amounted to 0,809 (manual) and 0,877 (slide), which is unstable ; and the slope LT03 with FK amounted to 1,056 (manual) and 1,070 (slide), which is in critical condition. In order to solve the instability of the slope, PT Timah (Persero) Tbk. Can alter the slope’s geometry and install a grouted tieback anchors at unstable slopes.

Co-Authors Abrianto Akuan Adibrata, Sudirman Adiyatma Adiyatma Alfitri Rosita ANDRI KURNIAWAN Artasari, Elsha Delvi Bayu Rahmadika Damos Tiambunan Delita Ega Andini Denny Syaputra Desi Fatimah Dwikorita Karnawati Elisa Elisa Elsha Delvi Artasari Epi Epi EPSB Taman Tono Erika Saskia Ferra Fahraini Franto, Franto Gregorius Fredrick Guskarnali, Guskarnali Haslen Oktarianty Hermita Ramadhini Indra Gunawan Indra Hot Daniel Hutasoit Irza Tri Putra Janiar Pitulima Jimmy Irawan Lenny Lenny Leyriesa Awdina Mardiah Mardiah Masyeba Evans Lubis Maulana Firdaus Muh. Yusuf Muhammad Rizki Aulia Muhammad Yusuf Mukram Belto Pratama Mu’alimah Hudatwi Mu’alimah Hudatwi Nabila Faradibah Nandito Andrian Pamungkas, Aditya Pignollee Donarthy Pratama Aditya Irawan Rajandra Nurhadi Randa Wirana Rezky Dwi Aditya Roby Hambali Siti Halimah Nasution1 Teo Aldino Vikram Rinaldi Wahyu Wilopo Yayuk Apriyanti, Yayuk Zuhirmanto Zuhirmanto

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