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Gusman, Mulya
Jurusan Teknik Pertambangan FT UNP

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ANALISIS KESTABILAN LUBANG BUKAAN BERDASARKAN KLASIFIKASI GEOMEKANIKA PADA TAMBANG BAWAH TANAH CV. TAHITI COAL, KOTA SAWAHLUNTO, SUMATERA BARAT Desmawita, Ika; Kopa, Raimon; Gusman, Mulya
Bina Tambang Vol 3, No 1 (2018): Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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The excavation of a tunnel in rock mass resulting a change in the balance of rock conditions such as the occurrence of rock collapse and changes in the dimensions of tunnel at the tail gate THC-02 as a result of the displacement of the voltage distribution. It is desirable to have a good geotechnical analysis to provide an appropriate treatment of rocks excavated. This research was conducted to determine rock mass class, rock strength, and stability of open aperture based on potential of wedge collapse by estimating value of Safety Factor (FK) of openings and recommendation of ground support at tail gate hole THC-02 branch C-6.Classification of rocks mass with RMR system and FK potential of wedge using unwadge software. From the measurement of several parameters of RMR method, the average RMR value of 45,3 is obtained whereas rock mass class III (fair rock). From RMR value also obtained the maximum span value of tunnel is 3 m with collapse time 90 hours and collapsed load value 3.705 kg/ m2. The kinematic potential of wedge at the tail gate THC-02 branch C-6 in three general direction joint set with strike/ dip value: N1740E / 790, N1410E / 260, N1600E / 590 where FK value is 9,525 and the wedge stable.Based on the data it can be recommended as follows: if using rock bolt required rock bolt (20 mm diameter, fully grouted) with length 4 m spacing between 1,5-2,0 m bolt on the wall and roof and added wiremesh mounted systematically, 50-100 mm thick shotcrete installation on the roof and 30 mm on the wall, if wooden support required wood 20 cm diameter, length 2 m, grade III (360 kg / cm2) and spacing 1,5 m.
STUDI KELAYAKAN EKONOMIS PENAMBANGAN DAN PENGOLAHAN BAHAN GALIAN BASALT MENJADI BATU SPLIT DI AREA BUKIT KARANG PUTIH PT SEMEN PADANG Monalisa, M; Gusman, Mulya; Ansosry, A
Bina Tambang Vol 3, No 2 (2018): Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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PT Semen Padang merupakan salah satu perusahaan produsen semen di Indonesia yang mengelola dan memenuhi kebutuhan bahan baku utamanya sendiri. Selain terdapat bahan galian silicastone dan limestone, PT Semen Padang juga meiliki sumberdaya bahan galian basalt yang belum dimanfaatkan. Bentuk dan penanganan dalam memanfaatkan bahan galian basalt berupa penambangan dan pengolahan yang menghasilkan output berupa batu split. Hal ini dilakukan karena bahan galian basalt tidak dapat dijadikan bahan dalam pembuatan semen kerena memiliki kadar MgO lebih besar dari 5%. Sebelum dilakukannya kegiatan penambangan perlu dikaji terlebih dahulu kelayakan teknis dan ekonomis dari penambangan dan pengolahan bahan galian basalt tersebut.Kegiatan penambangan yang dilakukan berupa pemboran dan peledakan dengan kedalam lubang ledak hasil pemboran 9,2m dan volume yang terbongkar sebanyak 44558,6 ton/bulan. Bahan peledak yang digunakan sebanyak 5127.5 kg Dabex, 66 pcs inhole delay, 65pcs surface delay dan 66 booster. Material hasil peledakan digali dengan 1 unit excavator Komatsu PC300 untuk dimuat ke truk Hino FM260JD sebanyak 2 unit. Untuk kegiatan penunjang penambangan di butuhkan 1 unit Wheel Loader dan Buldozer. Crusher yang digunakan adalah jaw crusher type PE-750x1060 sebagai primary crushing dan cone crusher type PYFB 1321 STD M sebagai secondary crushing. Biaya pengeluaran yang dibutuhkan untuk memproduksi 7.815.383 ton batu split basalt adalah sebesar Rp272.468.571.040,02. Maka biaya produksi per tonnya adalah sebesar Rp34.863,11 per ton (di luar pajak pendapatan dan pajak bahan galian) atau Rp.71.928,05 (sudah termasuk pajak bahan galian dan pajak pendapatan). Berdasaran hasil analisis investasi, didapat nilai tiga parameter berikut; Net Present Value Rp128.769.327.542 Internal Rate of Return 162,8179% dan Payback Periode 0,6145 tahun. Dengan demikian dapat dinyatakan penambangan dan pengolahan bahan galian basalt secara teknis dan ekonomis layak untuk dilakukan.
Penerapan Teknologi Biopori Di Perumahan Griya Tabing Banda Gadang Padang Muara Gusman, Mulya; Anaperta, Yoszi Mingsi; Octova, Adree
Bina Tambang Vol 4, No 1 (2019): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. Problems of environmental damage such as flood, garbage and drought in Indonesia is a problem that can not be solved. One of the things that cause problems to this flood is this is the decreasing of water absorption area and unconscious society not to throw garbage carelessly. Limited land in residential areas results in space for water catchment areas and few dumps. The purpose of this community service activity is to provide knowledge and skills to the community about the application of environmentally appropriate technology that is Biopori Absorption Hole technology (LRB). This activity is useful to increase the ground water reserves and reduce the waste as well as to produce compost. Partners of this activity are 2 groups of residents Rukun Tetangga (RT) that is RT 04 and RT 06 Village Tabing Banda Gadang, District Nanggalo, Padang. This form of activity consists of lectures and practices of making biopore infiltration holes. The practice of making the biopore infiltration hole involves community participation. Many of the created biopore holes are made up of 10 holes per each RT. The hole is 10 cm in diameter and 100 cm in depth. The holes that have been made therein incorporated organic waste in the form of remnants of vegetables, paper, fruit peels and others - others. Thus LRB is useful in reducing waste, increasing groundwater reserves, reducing the flow of surface water that causes flooding and will reduce the dangers of drought. Besides, LRB will produce compost that can be useful to increase people's income. Keywords:  Biopori Absorption Hole (LBR), Flood, Organic and Inorganic Waste.
PERHITUNGAN PENGARUH KEMIRINGAN DAN DEBIT AIR PADA PEMAKAIAN SHAKING TABLE DALAM PENGOLAHAN BIJIH TIMAH LOW GRADE DI POS PAM PENGAREM PT TIMAH (PERSERO) TBK Kohirozi, Nopi; Heriyadi, Bambang; Gusman, Mulya
Bina Tambang Vol 1, No 1 (2014): Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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ABSTRACT PT TIMAH (Persero) Tbk is a National Bussines Agency (BUMN) which move on mining field. The core business of this company is tin mining. The result of land mining held by business partner that fulfill the standard of PT TIMAH (Persero) Tbk is Sn with content > 20%. Due to rareness of the stockpile and since the processing tin content is become lower and lower, therefore a technology to process the low grade tin ore with fine grain into an acceptable content of PT TIMAH (Persero) Tbk is needed.One of the tools being used this time is shaking table.Today, in the operation, the use of shaking table by business partner of PT TIMAH (Persero) Tbk. Thus, the problem is whether the variables arrangement of shaking table operation for this time do not fit the feed condition, so that it can influence the time and the cost of the process. Therefore, there should be an analysis of the shaking table operation variables, so that a good suitability can be obtained in order to increase the cassiterite gain.According to the research result, it can be concluded that the main factors which cause the low gain of tin ore is over sloping tilt (3˚ and 3˚), and over sloping (5˚ and 5˚) and a too high water discharge (7 litres/minutes and 8 litres/minutes). The best result can be obtained through experiment with a moderate tilt (3˚ and 5˚), small water discharge  which produce average content 20,30 % Sn, concentrate result weight 49,01 Kg and concentrate content weight 9,94 Kg Sn.Keyword : low grade, slope, water discharge, shaking table ABSTRAK PT TIMAH (Persero) Tbk adalah Perusahaan Badan Usaha Milik Negara (BUMN) yang bergerak di bidang penambangan. Bisnis inti perusahaan ini adalah penambangan timah Hasil dari Penambangan di darat yang dilakukan oleh Mitra Usaha yang dapat diterima oleh PT TIMAH (Persero) Tbk adalah dengan kadar       Sn > 20%. Dengan semakin sulitnya cadangan yang tersedia dan semakin rendah kadar timah yang diolah maka diperlukan suatu teknologi yang dapat mengolah bijih timah low grade dengan butiran yang halus menjadi bijih timah dengan kadar yang dapat diterima oleh PT TIMAH (Persero) Tbk. Salah satu alat yang digunakan saat ini adalah shaking table. Saat ini pemakaian shaking table oleh mitra usaha PT TIMAH (Persero) Tbk belum mempunyai standar baku dalam pengoperasiannya. Dalam pengoperasiannya masih menggunakan trial dan error. Berdasarkan kondisi di atas, permasalahan yang timbul adalah apakah pengaturan variabel-variabel operasi shaking table selama ini belum sesuai dengan kondisi umpan (feed) sehingga berpengaruh terhadap waktu dan biaya proses. Oleh karena itu, perlu dilakukan kajian terhadap kondisi variabel-variabel operasi shaking table yang digunakan sehingga dapat diperoleh kesesuaian yang baik dalam meningkatkan perolehan cassiteriteBerdasarkan hasil penelitian maka didapatkan bahwa faktor-faktor utama yang menyebabkan rendahnya perolehan bijih timah adalah kemiringan yang terlalu landai (3˚ dan 3˚),dan terlalu miring (5˚ dan 5˚) dan debit air yang terlalu cepat  ( 7 liter/menit dan 8 liter/menit ). Perolehan terbaik didapatkan pecobaan dengan kemiringan yang sedang (3˚ dan 5˚) debit air yang kecil 6 liter/menit. Perolehan percobaan terbaik pada 3˚ dan 5˚ debit air yang kecil 6 liter/menit, menghasilkan Kadar rata – rata 20,30 % Sn, Berat hasil 49,01 Kg dan berat kadar 9,94 KgSn.Kata Kunci: low grade, Kemiringan, debit air, shaking table 
ESTIMASI CADANGAN INSITU MELALUI KEGIATAN INPIT DRILL PADA BUKIT EVEREST, CHEROKEE, DAN STRADA DI PT ANTAM (Persero) Tbk UBPN SULTRA Yurnia H, Fathonie; Gusman, Mulya; Octova, Adree
Bina Tambang Vol 3, No 2 (2018): Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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Penelitian ini membahas tentang pengoptimasian cadangan insitu nikel laterit pada Bukit Everest, Cherokee, dan Strada di PT ANTAM (Persero) Tbk UBPN SULTRA. Karena pada lokasi tersebut berdasarkan laporan penelitian terdahulu adanya perbedaan hasil estimasi cadangan berdasarkan klasifikasi kadar yaitu bijih dengan kadar Ni < 1.3 % tergolong pada kualitas waste, bijih dengan kadar Ni 1.3 -1.5 % tergolong kualitas limonit, bijih dengan kadar Ni 1.5 – 1.8 % tergolong kualitas Low Grade Saprolite Ore (LGSO), bijih dengan kadar Ni 1.8 – 2.0 % tergolong pada kualitas Hight Grade Saprolite Ore (HGSO), sedangkan untuk bijih dengan kadar Ni > 2.0 % akan mempertimbangkan kadar Fe dari bijih tersebut. Apabila Fe < 14 % maka tergolong kedalam HGSO dan jika Fe > 14 % maka tergolong LGSO dari kegiatan eksplorasi rinci dan inpit drill. Oleh karena itu perlu dilakukan pengkajian mengenai hal-hal yang menyebabkan perbedaan estimasi cadangan serta nilai ekonomis kegiatan inpit drill sehingga didapatkan benefit dari kegiatan inpit drill. Metode penelitian yang diterapkan adalah deskriptif kualitatif yang bersifat pembuktian dengan memadukan beberapa data yang meliputi kajian pustaka, data pengeboran, dan data analisis kadar serta nilai ekonomis dari kegiatan inpit drill. Berdasarkan hasil penelitian yang dilaksanakan dapat disimpulkan beberapa hal berikut. Pertama, Perbedaan yang signifikan terjadi pada kualitas LGSO dan HGSO karena jumlah cadangan yang memiliki nilai ekonomis dan dijadikan sebagai umpan pabrik yaitu HGSO dan LGSO pada kegiatan inpit drill lebih banyak dibandingkan pada kegiatan eksplorasi rinci.Kata Kunci: Cadangan, Eksplorasi Rinci, Inpit Drill, Nikel, Nilai ekonomis
OPTIMASI ALAT GALI MUAT DAN ALAT ANGKUT TERHADAP PRODUKSI BATUBARA DENGAN METODE KAPASITAS PRODUKSI DAN METODE TEORI ANTRIAN PADA PIT TAMAN PERIODE OKTOBER 2016 UNIT PERTAMBANGAN TANJUNG ENIM PT. BUKIT ASAM (PERSERO) Tbk. Alifa, Alifa; Gusman, Mulya; Prabowo, Heri
Bina Tambang Vol 3, No 2 (2018): Jurnal Bina Tambang
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Equipment is a very important factor in ensuring the sustainability of mining production. Theamount of excess fleet will result in inflated operating expenses, while the number of fleetsthat little will reduce the number of mine production. Ideal conditions in the process ofloading and transportation of materials is very difficult to achieve. However, it can beattempted through efficiency tehadap number of major mining dump truck. One simulationmethod that can be used to optimize the production of electric load - dump truck main methodis to use the production capacity and queuing theory. Simulations conducted in order toobtain optimum number of trucks with truck queuing time the minimum and avoid waiting forthe appliance load dump truck.Unloading tool used was Excavator Backhoe Komatsu PC 400 consist of 2 units. Dump truckwhich is a truck used Hino 500 FM 320 TI totaling 12 units. Based on simulation results withsimulation approach production capacity dump truck takes 11 units while the dump truckqueues based on the theory that it takes 11 units. In actual dump truck used is 12 units.Keywords : excavator, dump truck, match factor, production optimize, queuing theory
Analisa Distibusi Fragmentasi Pada Kegiatan Peledakan Batuan Dengan Menggunakan Simulasi Monte Carlo Yulhendra, Dedi; Gusman, Mulya
Bina Tambang Vol 3, No 4 (2018): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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This Research based on the partially fragmentation which the boulders blasting results more than 80cms that intervene the crusher’s performance. The purpose of this Final Project is to get the exact value of powder factor; in order to attain the value of fragmentation up to 80 with optimally hold on 10%.The methodology problem that used is finding the value of rock factor by using Monte Carlo simulation and calculate the effect of powder factor on fragmentation with linear regression.The result of this final project is attained the value of rock factor 5.01 by using Monte Carlo simulation and the relationship between powder factor with the fragmentation is 72% with equation Y = -102,89X + 50,086. Based on its calculation, to attain the maximum result of fragmentation holding up to 10%, therefore the exact value of powder factor is 0,389.  Keywords: boulder, fragmentation, powder factor, rock factor
Evaluasi Kondisi Jalan Angkut dari Front Penambangan Menuju Rom Stockpile untuk Mencapai Target Produksi 15.000 Ton Batubara Perbulan PT. Prima Dito Nusantara Jobsite KBB Kabupaten Sarolangun, Provinsi Jambi Maulana, Bram Subhan; Gusman, Mulya
Bina Tambang Vol 3, No 3 (2018): JURNAL BINA TAMBANG
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Coal production produced by PT. Prima Dito Nusantara by dumptruck is currently 9.977,48 ton/bulan, looking at the condition of the existing equipment, it is planned to produce daily from the dumptruck to be further improved so that the production that can be achieved by the dumpt truck can reach 15,000 tons / month. Therefore, the problem to be examined is "is the condition of the haul road being used at this time ideal to achieve the coal production target of PT .Prima Dito Nusantara". With the evaluation of haul roads are expected to help the problems that exist in the company so that the productivity of the means of transportation to increase and production to be achieved. The research method conducted in the field is by measuring along the haul road from the mining front to the rom stocpile by calculating the width of the haul road, the distance and the slope and then comparing the actual condition in the field with the result of calculation based on the theory. The results showed that the width of the minimum haul road for straight road conditions must be made that is 11 m and 15 m for the bend.The slope at the bend (superelevation) with the theoretical bend width of 15 m must be made 30 cm so that the transport can pass the bend with maximum speed. Based on the theoretical width of the cross slope to be made is 22 cm to the side of the road so that the road body is not inundated with water, while the slope of the haul road is 15%. The results of the research analysis will then be made a recommendation as a solution of the problems that occur. Keywords: Hauling Road, Cross Slope, Superelevation, Road Transport Slope, Coal Production.
Evaluasi Geometri Jalan Tambang Menggunakan Teori AASHTO Untuk Peningkatan Produktivitas Alat Angkut Dalam Proses Pengupasan Overburden Di PIT Timur PT. Artamulia Tatapratama Desa Tanjung Belit, Kecamatan Jujuhan, Kabupaten Bungo Provinsi Jambi Multriwahyuni, Audia; Gusman, Mulya; Anaperta, Yoszi Mingsi
Bina Tambang Vol 3, No 4 (2018): JURNAL BINA TAMBANG
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Abstract.PT. Artamulia Tatapratama (PT. ATP) is a coal mining company with a surface mining system. As a result of not achieving the production target where one of the causes is the condition of the haul road, it is necessary to evaluate and improve the road. In this study, the geometry evaluation of the road will use the 1993 AASHTO.Based on the results of road geometry evaluation, the results obtained as follows: the actual straight road width is between 13-30 m while the theoretical road width should be 21.7 m. Actual road grades from Pit to disposal ranging from 2.47% to 11.30%. Cross slope from Pit to disposal is 440 mm / m. Superelevation figures of 26.88 meters curved is 0.04. So that the height difference between the inner and outer sides of the bend that must be made is 1.07 m. Actual productivity before road repair using a dump truck is Hitachi EH 1700 on average 98,309 BCM / Hour. Productivity has not reached the production target set by PT. Artamulia Tatapratama is 114 BCM / hour. As for productivity after road improvement 118,231 BCM / hour. The productivity has met the production target set by PT. Artamulia Tatapratama is 114 BCM / hour.  Keywords: Surface mining, Open Pit Mining, Haul Road, Overburden, Productivity
Evaluasi Optimalisasi Alat Gali Muat dengan Metoda Overall Equipment Effectiveness (OEE) untuk Memenuhi Target Produksi Batubara Bulan Maret 2018 di Pit 1 Utara Bangko Barat PT.Bukit Asam Tbk, Tanjung Enim Sumatera Selatan Agustino, Yugo; Gusman, Mulya
Bina Tambang Vol 3, No 4 (2018): JURNAL BINA TAMBANG
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Abstract. Based on coal production data in North Pit 1, West Banko Mine PT. Bukit Asam, Tbk in March-May 2018, coal production does not reach the target. This is due to the low productivity of the excavator. To find out the improvement potential of a production process and the effectiveness of using an equipment, it is necessary to do an analysis using the Overall Equipment Effectiveness (OEE) method. OEE is known as one of the applications of total productive maintenance programs that have the ability to clearly identify the root of the problem and its causal factors so as to make the improvement effort more focused. After the root cause of the problem is known, it is used multiple linear regression statistical analysis and simple linear regression to determine the relationship and the maximum limits of the obstacles so that production can be achieved. After analysis and improvement with these methods obtained the production of backhoe komatsu PC 400LC, volvo EC 480DL, volvo EC 330BLC exceeded the planned target. However, the OEE value of each excavator still <85% has not reached world-class OEE value> 85%, it can be concluded that the condition of the equipment is not good. It is better to do repairs to standby time and tool breakdown. Keywords: Production,  Overall Equipment Effectiveness  (OEE),   Linear Regression  Statistical Analysis, Back Hoe, Standby Time