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All Journal Journals Mining Engineering : Bina Tambang
Rizto Salia Zakri
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Earth & Planetary Sciences

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Analisis Pengaruh Pemasangan Kisi Beton (Concrete Crib) Sebagai Perkuatan Lereng Terhadap Kestabilan Lereng Dengan Menggunakan Metode Kesetimbangan Batas Di PT. Dairi Prima Mineral Kabupaten Dairi Provinsi Sumatera Utara Wiwik Windasari B Manalu; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 6, No 5 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i5.115168

Abstract

PT. Dairi Prima Mineral is a company engaged in the field of mineral mining, this is in the form of zinc ore and black lead minerals whose mining locations are located in Sopokomil Village, Dairi Regency, North Sumatra. the mining system is carried out with an underground mining system. construction activities or preparation for mining activities, the most important thing to do during construction activities is to pay attention to the condition of the mining area, especially slope stability, PT. Dairi Prima Mineral carries out protection activities on the slopes, this is related to the long-term safety of the slope treatment, and plans to build processing plant facilities and other infrastructure under the foot of the slope or the toe which is 10 meters from the slope.The method used is the boundary equilibrium method (simplified Bishop). As a result of the research, it can be concluded several things, namely the slopes in area 8 in actual conditions using actual slope geometry data in the field as well as laboratory testing to obtain physical and mechanical properties of soil and rock and after that a modeling of the slopes is carried out to see the slope safety factor and simulation on the slopes. when the slope is given a concrete crib, for the actual condition the safety factor for single slopes is 1,271 natural conditions and saturated conditions 1,231, from the actual conditions the slopes are not stable so it is recommended to use a double bench with natural slope FK 1,429 and saturated 1,393, from the recommendation FK has not complied with SNI 8470-2017 FK≥ 1.5. Furthermore, the double bench slope was given anchor bolt reinforcement for stable slope conditions with FK 1,535 saturated conditions and natural conditions 1,601 with the number of anchors used 24 anchors and the distance between anchors 3 meters with a length of 9 meters, from safe slope modeling or slopes in a stable condition with FK 1.5 for permanent slopes and long term slopes.After it is known that slope reinforcement with retrofit planning using the previous reinforcement specifications in area 8 is very maximal and economical, it can be seen from slope analysis using the simplified Bishop boundary equilibrium method by getting FK≥ 1.5  Keywords: Analysis, Slope Reinforcement, Concrete Crib, Bishop's Method, Slope Geometry. 
Evaluasi Dan Rancangan Sistem Ventilasi Pada Tambang Batubara Bawah Tanah Lubang BMK 35 Lori 4 PT. Bara Mitra Kencana. Kota Sawahlunto, Provinsi Sumatera Barat. kurnia arrafi siregar; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 6, No 4 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i4.114366

Abstract

CV. Bara Mitra Kencana is a coal mining company located in Talawi District, Sawahlunto City, West Sumatra Province. The company has experienced an incident  fatality since January 2020 which occurred in the tunnel BMK35 lori 4. In order to prevent fatality in other tunnels, therefore it has  research mine ventilation system in the tunnel BMK35 lori 4. This study was conducted to obtain a likely factor causes of fatalityBased on KEPMEN ESDM Number 1827K / 2018 pages 104,107, and 177 regarding mine ventilation, the measurement results obtained are close to or not following details such as the air temperature at BMK35 Lori 4  from 29˚C to 31˚C, and humidity is between 95% to 100%. BMK35 Lori 4 has a concentration of oxygen (O2) 19.8%, Sulfide (H2S) 0%, Carbon Monoxide (CO) 0.036% and Methane (CH4) has been 0.35%. refer to the minimum air quantity requirement of 2,546 m3/s that have been fulfilled, so that the air needed in the field  by 2.4 m3/s.In order to overcome this problem, The researchers designed an underground mine ventilation system using the Ventsim software. The ventilation design was planned to use 3blowers with 16-inch diameter.. The blowers had used supplies  air to C6 and workface through a duct in a total of 2 pieces and  blower for exhaust air out of the mine mouth through ducts as much as 1 piece. The results of the simulation using the Ventsim application showed the air quantity increased from 2.4 m3/s to 2.7 m3/s.
Analysis Stability of the Tunnel # 11 Jakarta – Bandung High Speed Train Using Finite Element Method Aprig Ustianto; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 6, No 5 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i5.115157

Abstract

Tunnel 11 has total length of 1,1 km. the shape of tunnel 11 was horseshoe with 15 meters wide and 13 meter high. Form classification rock mass rating (RMR) analysis, excavation recommendation on tunnel 11 by using full face method. Whereas actual excavation in the field with top heading and banching method. Based on the alignment required a plan of tunnel stability by using finite element. Analysis of tunnel’s stability using a full face excavation method based on RMR value. Tunnel stability with method of digging the top heading and bench and the optimized buffer based on the simulation carried out. The tunnel’s stability analysis is reviewed by the strenght factor and displacement value in the tunnel. Based on analysis with full face excavation method, on the left wall with no suport it’s got the lowest strenght factor value that is 6,3 and biggest displacement value that is 1,69 cm. with excavation on lower left side of the wall without support there was the smallest value of factor that is 5,2 and the biggest displacement value is 1,7 cm. strenght factor value by using full face excavation with top heading and benching threshold value strenght factor according to the KEPMEN 1827K/MEM/2018 and threshold deformation value according to japan society engineers ( JSCE ) based on a modeling simulation of the tunnel’s stability from economic side and stability analysis, then the optimal insulation on tunnel 11 is shotcrete K-175 #10 mm with top heading and benching excavation. 
REKONSILIASI RENCANA SEQUENCE PENAMBANGAN DENGAN REALISASI DI PIT X PADA BULAN MEI 2021 DI PT. BUKIT ASAM,TBK. TANJUNG ENIM, SUMATERA SELATAN Didan Ramaddandy; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 6, No 3 (2021): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v6i3.115979

Abstract

During mining sequences at Pit X, PT. Bukit Asam,Tbk incompatibilities over-stripping, overcut, and undercut frequently happen as a result of the reconciliation between mine plan design with realization in the field. These incompatibilities can be happened repeatedly every month due to undercut material, proven by the reconciliation data on March and April 2021. So there needs a reconciliation on May 2021 to figure out incompatibility between mine plan design with the realization, obtain the causing factors and solutions to minimize incompatibilities occurred. The analysis to find out the incompatibilities on May 2021 was carried out by overlay the mine progress map with mineplan design, creating cross-sections, calculating the volume from the latest mining activity of the month, analyzing causing factors with the actual data to obtain the solutions of the problems. Analysis results proved that on May 2021 over-stripping, overcut, and undercut incompatibility sequentially occurred for overburden of 226.950,79 BCM, 147.927,12 BCM, and 491.891,14 BCM, while for coal it is 59.249,65 Tons, 77.733,18 Tons, and 134.776,15 Tons. From the analysis, the causes of the incompatibilities are the number and placement of fleets that don’t base on the plan, low productivity of digging and loading equipment, incompatibility of mechanical equipment used, and supervision factors. Those incompatibilities affect the increase of the stripping ratio for the next month’s plan. Several actions can be done such as replacing digging and loading equipment on both fleets with higher specifications, adding mining boundaries, and improving supervisions in the field to minimize the incompatibilities.
Analisis Kinerja Crusher Pada Kegiatan Produksi Batu Gamping Berdasarkan Efisiensi Biaya Operasional Untuk Mencapai Target Produksi PT. Sumbar Calcium Pratama, Kecamatan Lareh Sago Halaban, Kabupaten Lima Puluh Kota Indah Suryani; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 7, No 1 (2022): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v7i1.117670

Abstract

Abstract. PT. Sumbar Calcium Pratama is a company engaged in the limestone mining business. In its mining activities, PT. Sumbar Calcium Pratama focuses more on processing activities in the form of reducing limestone using a crusher crusher, this activity uses 3 crusher units with a production target of each crusher A 2.5 tons/hour, crusher B 2.5 tons/hour, and crusher C 5 tons/hour so that the total production is 1750 tons/month. In October PT. Sumbar Calcium Pratama is only able to produce a production of 1,302 tons/month this is due to the non-optimal use of the crusher, it is necessary to calculate the productivity of the tool so that it can be optimized according to the working hours that have been set so that there is no excess financing. The purpose of this study is to determine operational costs in limestone processing, and knowing the value of crusher efficiency.From the calculation results, the cost of crusher A is 130,167/ton, crusher B 156,919/ton, and crusher C 174,179/ton. After being analyzed for calcium carbonate production, the planned production targets are crusher A 119.742/ton, crusher B 151.213/ton, and crusher C 155.064/tonKeywords:  production, operational costs, work efficiency
Analisis Biaya Operasional Penambangan Metode Full Costing Pada Tambang Bawah Tanah CV. Tahiti Coal Sangkar Puyuh, Kecamatan Talawi, Kota Sawahlunto Atha Angely Diansa; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 7, No 1 (2022): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v7i1.117666

Abstract

Abstract. Calculation of the cost of production is very important and can be used the basis for preparing Calculation of the cost of production is very important and can be used as the basis for preparing reports. The purpose of this study was to determine the operational costs of mining and to analyze the comparison of the full costing method and the variable costing at CV. Tahiti Coal. Research results and calculations, the total cost of mining operations in CV. Tahiti Coal in January-December 2020, which is Rp.9.897.410.093. The cost of production using the full costing method in the current condition is Rp.357.449/ton and when the condition is reached, the production is Rp.257.355/ton. The variable costing method in the current condition is Rp.346.356/ton and when the condition is reached, the production is Rp.254.795/ton. The total profit earned by CV. Tahiti Coal in January-December 2020 is Rp.13.638.239.907 (full costing method) and Rp.13.945.403.079 (variable costing method).
ANALISIS GEOMETRI JALAN TAMBANG AREA LOADING POINT PIT 2 MENUJU STOCKPILE TERHADAP PRODUKTIVITAS ALAT ANGKUT FUSO 220 PS DI CV. DIAN PURNAMA, KABUPATEN SIJUNJUNG, PROVINSI SUMATERA BARAT Muhammad Shidiq; Rizto Salia Zakri
Journals Mining Engineering : Bina Tambang Vol 7, No 1 (2022): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24036/bt.v7i1.117769

Abstract

A good haul road is a road that can make the haul equipment run optimally. Distance from the front loading pit 2 area to the stockpile is 440 meters which consists of 4 segments. This research will analyze the condition of the Loading Point haul road to the current stockpile in each segment, make an improvement plan so that the haul road condition conforms to predetermined standards, analyze the effect of improving haul road geometry on the travel speed of the Mitsubishi Fuso 220 PS, and analyze the effect of improving haul road geometry on the productivity of the Mitsubishi Fuso 220 PS conveyance. With the haul road analysis, it is known that there is a need to improve the geometry of the haul road on a straight road with an ideal width of 4.92 meters, a bend road of 7.35 meters, the formation of a cross slope of 40 mm/m, making a superelevation so that the height difference that must be made is 0 .29 meters, and the need for haul road pavement. Through these improvements, with a coal production target of 5,000 tons/month, it is known theoretically that productivity from 125.66 tons/hour has increased to 186.92 tons/hour.
Co-Authors Aprig Ustianto Atha Angely Diansa Didan Ramaddandy Indah Suryani kurnia arrafi siregar Muhammad Shidiq Wiwik Windasari B Manalu