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All Journal Journal of Aquatropica Asia IKRA-ITH ABDIMAS Jurnal Himasapta Jurnal Riset Kelautan Tropis (Journal Of Tropical Marine Research) (J-Tropimar) MINERAL JAGE
Irvani, Irvani
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology

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ANALISIS POTENSI DAN STRATEGI PENGEMBANGAN WISATA BAHARI DI PULAU PANJANG DAN PULAU TINGGI KABUPATEN BANGKA SELATAN Andini, Delita Ega; Guskarnali, Guskarnali; Irvani, Irvani
IKRA-ITH ABDIMAS Vol 2 No 3 (2019): IKRAITH-ABDIMAS VOL 2 NO 3 BULAN NOVEMBER 2019
Publisher : Universitas Persada Indonesia YAI

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (897.31 KB)

Abstract

Indonesia merupakan negara yang terdiri dari beribu-ribu pulau dan merupakan negarakepulauan. Untuk meningkatkan perekonomian masyarakat salah satu sektor yang palingmendukung berdasarkan letak geografis yaitu sektor pariwisata. Bangka Belitung merupakan salahsatu provinsi yang merupakan provinsi kepulauan yang terdiri dari Pulau Bangka dan PulauBelitung. Bangka Selatan merupakan salah satu Kabupaten yang beberapa kecamatannya beradadi gugusan pulau. Pulau Panjang dan Pulau Tinggi merupakan pulau yang ada di Bangka bagianpaling Selatan yang mempunyai potensi wisata bahari yang mememungkinkan meningkatkanperekonomian masyarakat lokal. Namun kendala pengembangan potensi pariwisata yaitu padasarana dan prasarana yang ada di Pulau Panjang dan Pulau Tinggi. Strategi pengembangan wisatabahari dilakukan dengan memaksimalkan kekuatan dan mengambil semua peluang untukmemperkenalkaan pulau-pulau yang ada di Desa Penutuk, Bangka Selatan.
Sebaran Nitrat dan Kelimpahan Fitoplankton di Pantai Tanah Merah dan Pulau Semujur Yusuf, Muh.; Pamungkas, Aditya; Hudatwi, Mu’alimah; Irvani, Irvani
Jurnal Riset Kelautan Tropis (Journal of Tropical Marine Research) (J-Tropimar) Vol 2, No 2: November 2020
Publisher : Universitas Hang Tuah

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30649/jrkt.v2i2.45

Abstract

Perairan Pantai Tanah Merah dan Perairan Pulau Semujur, ke dua lokasi tersebut terletak di Kabupaten Bangka Tengah. Secara Geografis yang membedakan ke dua lokasi tersebut adalah, lokasi yang satu berada di daratan pantai (Tanah Merah) cukup jauh dari pemukiman penduduk, sedangkan lokasi yang lain berada di lingkungan perairan Pulau Kecil (Semujur), yang berpenduduk. Kondisi geografis yang berbeda tersebut dapat menyebabkan  kandungan unsur hara nitrat tentu akan berbeda, karena sumber unsur hara nitrat yang utama berasal dari kegiatan manusia di darat. Tingginya unsur hara Nitrat akan berpengaruh terhadap kelimpahan fitoplankton di perairan setempat. Penelitian ini bertujuan untuk mengetahui konsentrasi dan sebaran nitrat dalam kaitannya dengan kelimpahan fitoplankton di laut. Penelitian dilakukan di perairan pantai Tanah Merah dan perairan Pulau Semujur, Kebupaten Bangka Tengah. Penelitian dilakukan pada bulan Februari sampai April 2020. Hasil penelitian menunjukkan bahwa kandungan nitrat di perairan pantai Tanah Merah sebesar 0.011-0.026 mg/L (St.1-St.4) lebih rendah dibandingkan dengan perairan Pulau Semujur sebesar 0.046-0.10 mg/L (St.9-St.12). Data kelimpahan fitoplankton dan Indeks Keanekaragaman Jenis (H’) menunjukkan bahwa perairan pantai Tanah Merah sebesar 111.000-134.000 sel/L dan indeks H’ sebesar 2.06 - 2.16 lebih rendah dibandingkan dengan data kelimpahan fitoplankton di perairan Pulau Semujur sebesar 110.000-208.000 sel/L dan indeks H’ sebesar 2.22-2.29. Data pendukung berupa kecepatan arus di perairan pantai Tanah Merah berkisar antara 0.14-0.21 m/d lebih rendah dibandingkan dengan perairan pulau Semujur sebesar 0.22-0.32 m/d.    
Perencanaan Reklamasi Pada Lahan Bekas Penambangan Timah di PT Berkat Berjaya Sejahtera, Kabupaten Bangka Ramadhan, Setiawan; Irvani, Irvani; Andini, Delita Ega
Journal of Applied Geoscience and Engineering Vol 2, No 1 : Juni 2023
Publisher : Universitas Negeri Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.34312/jage.v2i1.18698

Abstract

One of the companies engaged in tin mining is PT Berkat Berjaya Sejahtera with reclamation planning from 2013 to 2022 with a planned land area of 10 Ha. However, the available area exceeds the planned area of 11.08 Ha. Based on these problems, the purpose of this research is to plan reclamation techniques and reclamation cost plans so that reclamation activities can run effectively and efficiently. The method used in this research is quantitative method. The data taken are soil pH and water pH data, topographic data (x, y, z coordinates). Data processing is carried out using a drone tool which is processed using surpac, minescape and surfer software. Based on the results of the research that has been carried out, it can be concluded that the reclamation technique plan is carried out by land stewardship by closing the void starting from elevation 2 to elevation 11 masl and leveling the land area to be reclaimed. The type of plant used in reclamation is oil palm the costs required for this reclamation are divided into 2, namely, Direct Costs and Indirect Costs. Direct costs required amount to Rp 1,326,572,000.00 and Indirect costs required amount to Rp 387,756,995.00. The total cost required for the reclamation of the 11.08 Ha land is IDR 1,714,328,995.
Kajian kestabilan lereng menggunakan metode kesetimbangan batas di pit C5 area bidadari blok mayang Kusuma, Dimas Dian; Irvani, Irvani; Tono, Taman
Jurnal Himasapta Vol 9, No 1 (2024): Jurnal Himasapta Volume 9 Nomor 01 April 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/jhs.v9i1.9516

Abstract

PT Menara Cipta Mulia (PT MCM) merupakan perusahaan bergerak dibidang pertambangan timah terintegrasi dan beroperasi di kawasan industri Kelapa Kampit, Kecamatan Belitung Timur. Berdasarkan survei pendahuluan pertambangan PT MCM pernah terjadi longsor di area lereng serta pada area Bidadari Blok Mayang masih banyak lereng berpotensi terjadinya longsoran dan perlu adanya penelitian yang mengkaji kondisi kestabilan lereng sebagai dasar dalam menetapkan geometri bukaan tambang, guna menghindari gangguan produksi dan potensi bencana yang mungkin terjadi. Analisis kestabilan lereng pada penelitian ini menggunakan metode keseimbangan batas Bishop yang disederhanakan, penggunaan metode ini dikarenakan longsoran yang terjadi berpotensi terjadinya longsoran busur karena banyak terdapat rekahan. Metode ini memenuhi kesetimbangan gaya pada arah vertikal dan kesetimbangan momen pada titik pusat lingkaran runtuh. Adapun hasil analisis kestabilan lereng dari evaluasi desain geometri lereng keseluruhan kondisi dinamis dengan beban seismik horizontal sebesar 0,056 gal dan beban excavator 55,73 kN/m2 pada penampang A–A’ didapatkan nilai FK lereng sebesar 1,205 dengan PK 24,5%, penampang B–B’ didapatkan nilai FK lereng sebesar 1,514 dengan PK 5,8 %, penampang C–C’ didapatkan nilai FK lereng sebesar 1,547 dengan PK 3,3%, dan pada penampang D–D’ didapatkan FK lereng sebesar 1,250 dengan PK 21,1%.
Analisa Pengaruh Ground Vibration terhadap Stabilitas Low Wall Blok Muara Tiga Besar Utara Pit Timur Menggunakan Software GeoStudio 2012 di PT Bukit Asam (Persero) Tbk, Kabupaten Muara Enim: Analysis of The Effect of Ground Vibration on The Stability of The Low Wall BlockNorth Muara Tiga Besar East Pit Using Software GeoStudio 2012 at PT Bukit Asam (Persero) Tbk, District of Muara Enim Antasari, Deza Pahlevi; Irvani, Irvani; Indriawati, Anisa
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i1.1546

Abstract

Ground vibration will produce variable Peak Particle Acceleration (PPA) which endanger the stability of the slope especially low wall. This study discusses the effect of ground vibration on the stability of the low wall and restricted in Block MTBU East Pit. While the slope analysis conducted by the method of Morgenstern-Price (1965) Manually and Software GeoStudio 2012, as well as statistical regression analysis approach in finding a relationship between the variables SD-PPA and PPA-FK. The higher the value of the PPA will lower prices Safety Factor (FK) of slope, proved to vibration FK 0.0133 g yield of 1.258 (C-C’) and 1.292 (D-D’), whereas the vibrations of 0.225 g yield of 0.771 FK (C- C’) and 0.768 (D-D’). The relationship between the scaled distance (SD) of the PPA produces non-linear relationship on a graph of power. The relationship between PPA against FK produces a linear relationship on the Section C-C’ and Section D-D’. The proposal obtained at a distance of 200 m from the blasting area 29.352 kg and at a distance of 500 m is 183.447 kg maximum load of explosives.
Evaluasi Produksi Kaksa Dalam Upaya Pencapaian TargetPemindahan Tanah Bulanan Sebesar 30.000 m3 DI TB.2.1 Tempilang, PT Timah (Persero) Tbk: Evaluation of Kaksa Production in Efforts of 30.000 m3 Earthmoving Monthly Target Achievementsin TB.2.1 Tempilang, PT Timah (Persero) Tbk Ramona, Pisca; Irvani, Irvani; Mardiah, Mardiah
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i1.1547

Abstract

Earthmoving target of 30,000 m3 in TB.2.1 Tempilang reached in March where production amounted to 36.350 m3, but the decline occurred in April at 1,83% with amount of production is 29.450 m3 and in May 46% with amount of production is 16,200 m3. Evaluation was conducted against the data rate of excavation In March until May, 2016. Other than that, evaluation of factors of production activities the influential hearts with how to calculate productivity tool for the reviews to know the tool's ability to produce kaksa, reviewing data that stop-time increasing production, the rate of rainfall, and sediment property value with the observe incision drill profile block in March, April, and May 2016. Based on the findings of evaluation, main factors failure achievement of production is time road experienced a decline of 05 hours during the month of April and 138 hours In May due to damage to the equipment and high rainfall reached 332 mm. Monthly soil removal target can be achieved with change hours number: Available 8 hours / day Being 10 hours / day.
Pengaruh Pengurangan Setting Time (Wait on Cement) pada Semen Tahan Api dengan Penambahan Oil Well Cement: The Effect of Reducing Setting Time (Wait on Cement) on Fire Mortar by Increasing Oil Well Cement Rahmadika, Bayu; Apriyanti, Yayuk; Irvani, Irvani
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i1.1548

Abstract

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: Manual Mine Plan and Software of Micromine As a Compare On Dredger 21 Singkep 1 At The Air Kantung Sea, PT Timah (Persero) Tbk Elisa, Elisa; Irvani, Irvani; Pitulima, Janiar
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i2.1559

Abstract

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: The Application of Software Geostudio 2007 Slope/w to analysis slope instability in Mine Muara Tiga Besar Utara at PT Bukit Asam (Persero)Tbk South Sumatera Putra, Irza Tri; Guskarnali, Guskarnali; Irvani, Irvani
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i2.1562

Abstract

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.
Penilaian Tingkat Kestabilan Lereng Batuan Granit Menggunakan Metode Slope Mass Rating (SMR) dan Analisis Kinematika di PT Mandiri Karya Makmur: The Assesment of Granite Rock Slope Stability Using Slope Mass Rating (SMR) Method and Kinematic Analysis in PT Mandiri Karya Makmur Mirsandi, Mirsandi; Irvani, Irvani; Fahraini, Ferra
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v2i2.1563

Abstract

PT Mandiri Karya Makmur (MKM) was a private company that mine granite rock. Level in mine site was almost steep so that it had the possibility to failure. The study was conducted to assess the stability of rock slope that may endanger the safety of workers. This study to determine the quality of rock mass of slope based on the value of SMR (Slope Mass Rating) and kinematics analysis. The data used included UCS, RQD, Space of discontinuity, Discontinuity conditions, Groundwater conditions and Discontinuity orientation data. Slopes data were divided into 4 scanline based on the direction changing of the slope. To determine the type of failure using kinematics analysis of Dips program and Schmidt Net.The analysis results revealed that the quality of rock mass for scanline II was very good or very stable based on the SMR value. While on the rock mass quality of scanline I, III and IV were good with the stability of the slope was in a stable condition. The possibility of a failure in scanline I, III and IV were only several blocks. There were two blocks that has possibility to failure was on scanline III and IV. Estimation direction of slope failure on scanline III and IV respectively were N 1350 and N 1850 E. The supporting of slope instability can be done by scaling or cutting blocks that have potential to failure.
Co-Authors Adiyatma, Adiyatma Akuan, Abrianto Aldino, Teo Andesta Granitio Irwan ANDRI KURNIAWAN Antasari, Deza Pahlevi Delita Ega Andini Elisa Elisa Epi Epi, Epi EPSB Taman Tono Fahraini, Ferra Faradibah, Nabila Fatimah, Desi Fredrick, Gregorius Guskarnali, Guskarnali Hudatwi, Mu’alimah Indriawati, Anisa Janiar Pitulima Kusuma, Dimas Dian Lenny, Lenny Mardiah Mardiah Mirsandi, Mirsandi Nurhadi, Rajandra Oktarianty, Haslen Pamungkas, Aditya Putra, Irza Tri Rahmadika, Bayu Ramadhan, Setiawan Ramona, Pisca Syaputra, Denny Tiambunan, Damos Tono, E.P.S.B Taman Yayuk Apriyanti, Yayuk Yusuf, Muh. Zuhirmanto, Zuhirmanto