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All Journal Bina Tambang Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri
Raimon Kopa
Universitas Negeri Padang
Computer Science & IT Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering

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Analisis Kestabilan Lubang Bukaan Tail Gate BT-06 Berdasarkan Klasifikasi Geomekanika (RMR-System) Pada Penambangan Bawah Tanah PT. Cahaya Bumi Perdana, Sawahlunto Fenny Aulia Gustin; Raimon Kopa
Bina Tambang Vol 5, No 5 (2020): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. The excavation of a tunnel through the rock mass causes its balance to be disrupted, hence the rock is unable to support its own load, the ground surrounding the excavation will collapse. Several analytical techniques such Geotechnical analysis which uses the Rock Mass Ratting System can be used to identify the rock mass characteristics in a tunnel. This research would provide findings based on rock mass class, rock strength, safety factor depends on the potential for wedge collapse and ground support recommendations. Based on the weighting obtained by the RMR system analysis, it is found that with a stand up time of 260 hours, the rock mass class is in Class III (fair rock). A safety factor of 16.471 (stable wedge) and 3 potential general joint directions that have the possibility for wedge collapse are obtained on the basis of the processing results (N173 ° E / 76 °, N142 ° E / 24 °, N113 ° E / 28 °).The RMR weighting data analysis suggest that if using rock bolt (20 mm diameter fully grouted) with a length of 4 m and a spacing of 1.5-2 m on the walls and roof then  added wire mesh installation, 50-100 mm thick shotcrete on the roof and 30 mm on the wall. Furthermore, if the wooden support is needed, use wood with a diameter of 20 cm, 2 m long and class IV with a spacing of 1.5 m.Keywords: Tunnel, Geotechnical, RMR-System, Safety Factor, Ground Support. 
Kajian Teknis Penyangga Baja Three Piece Sets dan Five Piece Sets Pada Lubang Bukaan Tambang Batubara Bawah Tanah Pit Central Barat Di PT. Allied Indo Coal Jaya Redy Pratama; Raimon Kopa
Bina Tambang Vol 3, No 4 (2018): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. Underground mining require system, design, and mine support capacity planning. The purpose of this research is to study technical part of the use of three piece and five piece steel support at Central Barat PIT underground mine in PT. Allied Indo Coal Jaya. The idea is comparing maximum moment of three pieces structured i-beam with five pieces structured support which almost has arches shape in the same area in the underground mine. This research method is quantitative, which mean getting numeric data, calculating load that apply on mine support, calculating mass of potential rock fall using appropriate empiric equation approach to measure the load that apply on these underground mine support. The research result shows that maximum moment on three pieces bar (BC) = 17.25 kN m and five pieces bar (CD) =      3.99 kN m. Five piece support take less moment compared to three pieces support, due to smaller surface and it distribute the load to each bar. At the same area, five pieces use smaller steel size 80 mm x 42 mm and 5,94 kg/m compared to three pieces with 140 mm x 66 mm and 14,37 kg/m size of steel. This cause the cost for steel use for five pieces support is more economical than three pieces supportKey words;  steel support, underground mine, three piece, five piece, and maximum moment
Evaluasi Geometri Peledakan Terhadap Fragmentasi Batuan Hasil Peledakan Digging Time Alat Gali Muat Dan Recovery Peledakan Di Pit B PT. Darma Henwa Tbk Bengalon Coal Project Kalimantan Timur Denny Prananda Libriyon; Raimon Kopa
Bina Tambang Vol 5, No 1 (2020): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstarct. PT. Darma Henwa Tbk is a mining contractor assigned by PT. Kaltim Prima Coal to conduct mining production and overburden production at Bengalon Coal Project, East Sepaso Village, Sub-district Bengalon, District East Kutai, Province East Kalimantan. Blasting is an important activity to make sure the productivity reach company target. PT. DH use Sanvik D50KS and Sanvik D245S to support drilling activity of blast holes and explosives used are Emulsion Synergy 335 product by PT. AEL Indonesia. Base on distribustion analysis of rock fragmentation result from actual blasting geometry data, the average rock fragmentation result from 5 times blasting that passed at 100 cm in size with split desktop software at 88.43%. Base on observation, average digging time recorded by excavator from 5 times blasting is 12,85 s/bucket. Beside that, recovery blasting archived by actual blasting is 85,4% less than 90% target. Whereas, the actual fees received is $ 2,807,629.10, less 21% from planned fees which is $ 3,541,889.10. Therefore solution needed to solve this problem by evaluate the blasting geometry using RL Ash method. Geometry will be choose by compare the fragmentation prediction using Kuz-Ram equation. As a results, three geometry option has been found and geometry option I selected to applied.Keywords: Blasting Geometry, Split Desktop, Rock Fragmentation, Recovery Blasting, Explosive Cost.
Analisis Potensi Longsor pada Ruas Jalan Malalak Km 33 di Kecamatan Malalak, Kabupaten Agam, Provinsi Sumatera Barat Resty Prasuryani; Rusli HAR; Raimon Kopa
Bina Tambang Vol 3, No 4 (2018): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. Based on observations made on Sicincin-Malalak street KM 33 have been found 12th failure point with various conditions and types of failure. In addition, the geometry of the slope, high intensity of the earthquake and rainfall greatly affect to the condition of slope stability. The research was done on rock  slope with many joints, steep geometry, and many rockfalls. From these problem, we need to measure the physical characteristic, compressive strength and rock mass condition in research area using Rock Mass Rating (RMR) classification. Furthermore, the analysis of potential failure in the research area doing using dips to know the type of failure and then analyzed the stability of the slope using the limit equilibrium  method.  The results of rock mass classification with RMR obtained rocks included in Group II which means rock mass in good condition. Analysis using dips in get type of failure is toppling failure with possibly 15,53% with failure stike = N 225 E - N 285 E and dip = 15° - 90°. Furthermore, slope stability analysis was performed using the equilibrium limiting method for toppling failure and obtained FK values of slope is 1,58 which means that the slope is stable but still need protection from rock fall with construction of ditch and wiremesh instalation.Keyword: Failure, limit equilibrium method, toppling, slope stability, RMR
Evaluasi Kinerja Crushing Plant Dan Belt Conveyor Dalam Pengolahan Dan Pengiriman Limestone Ke Storage Indarung di PT. Semen Padang Fitri Eka Yulia; Raimon Kopa; Yoszi Mingsi Anaperta
Bina Tambang Vol 3, No 1 (2018): Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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PT. Semen Padang has 4 units of crushing plant there are crusher II, IIIA, IIIB, and VI. Production of limestone crusher in April 2017 is 692,755 tons, while the target of limestone crusher production is 804,749 tons so the target of limestone crusher production in PT. Semen Padang in April 2017 was not achieved. This is caused of the target crusher working hours are not achieved, frequent improvements in the crusher, and the change of usage belt conveyor lines. The purpose of this research is to get the performance value of crushing plant and belt conveyor, get the production capacity of belt conveyor, reveal the ideal crusher working system so we can get the ideal limestone crusher production.This research was combined between theory with field data, then we can get the problem solving approach, and the result of data processing will be analyzed for subsequent to be generated a recommendation.Based on the research result can be concluded. First, the performance of crushing plant and belt conveyor is not optimal because the work efficiency of limestone crusher II is 26,20%, crusher IIIA is 21,54%, and crusher IIIB is 28,33%. Second, the minimum production capacity of the belt conveyor is 1,409.7 tons/hour. Third, the ideal crusher working hours is 672 hours in a month so that the production of limestone crusher 810,992 tons in a month.
Evaluasi Geometri Peledakkan Berdasarkan Pengaruh Perhitungan Blastability Index Untuk Mendapatkan Fragmentasi Ideal Pada Front Penambangan Di PT. Ansar Terang Crushindo 1 Pangkalan Koto Baru Kabupaten Lima Puluh Kota Sumatera Barat. Naufal Permanda; Raimon Kopa
Bina Tambang Vol 6, No 1 (2021): Journals Mining Engineering: Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. Geometric Determination of blasting and powder factor must show the rock mass characteristics and local geological conditions. Alternative geometry experiments were carried out to solve the resulting blasting problem. The alternative geometry design is determined using rock mass characteristics based on the Lilly Blastability Index, in the form of rock mass description, joint plane spacing, joint plane orientation, specific gravity influence and hardness. Based on the weighted results of the blasted rock mass, the Blastability Index value is 58.075. From the value, good blasting geometries are 3 inch boreholes, 2 m burden, 3 m spacing, 3.2 m blast hole, 0.2 m subdrilling, 3 m level height, 2.17 m steaming and material filling and 1.03 m explosive, 0.22 kg / m3 powder factor. From the results of the proposed geometry based on the lilly equation, the percentage of boulder desired by the company and the use of explosives is lower than the previously applied geometry.Keywords: rock mass characteristics, blastability index, geometry, balasting, fragmentation
Analisis Efisiensi Teknik Peledakan Top Air Deck Terhadap Fragmentasi dan Digging Time Alat Gali Komatsu PC 2000 pada Pembongkaran Overburden Di Pit Badak PT Multi Harapan Utama, Kalimantan Timur Josep L. Marpaung; Raimon Kopa
Bina Tambang Vol 4, No 4 (2019): JURNAL BINA TAMBANG
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. Demolition by blasting method is a method commonly used in the mining operations in order to obtain large productivity. Generate rock blasting activities into a certain fragmentation size, so it can be easier to do excavation and transportation. The effectiveness of blasting activities as a benchmark of the success of these explosions which are expected to have appropriate fragmentation and shorten the time of excavation, while the blasting efficiency is a measure of economical blasting activities. This study aims to assess the success of the top air deck blasting technique, and to estimate the optimum length of air decking on Pit Badak, PT Multi Harapan Utama. The research data consisted of powder factor, fragmentation of blasting and digging time excavator unloading. The method research is trial and error as well as statistical modeling. From the analysis conducted for blasting obtained with normal charge the percentage amount of the boulder is 2,29%, digging time 12.73 seconds, and used powder factor of 0.17 kg/bcm. Blasting with top air deck application of techniques derived boulder percentage of 7.59%, digging time 12.33 seconds, and powder factor of 0.14 kg/bcm. The optimum length of the air column (air deck lenght) is 1 meter with the percentage of boulder 7%, digging time 12.30 seconds, with the optimum powder factor 0.1450 kg/bcm. Top air deck techniques has reduce the use of explosives by 10-26%.
Analisis Kestabilan Lereng pada Lereng Akhir Penambangan PT. Koto Alam Sejahtera Kecamatan Pangkalan Koto Baru Kabupaten Lima Puluh Kota Provinsi Sumatera Barat ALVIN IRANTO PURNAMA; Raimon Kopa
Bina Tambang Vol 6, No 1 (2021): Journals Mining Engineering: Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. PT. Koto Alam Sejahtera is a private company engaged in the mining of andesite stone with open pit mining with quarry method. The mining activity forms a final slope whose stability is not yet known. In addition, the presence of weak areas on the final mining slope can weaken the rock mechanical parameters and there are fractures and water seepage on the slope which has a slope angle of 81 ° with a slope height of 12.343m. Therefore, it is necessary to have an analysis of the stability of the slopes at that location to prevent landslides. In this study, the analysis used was kinematic analysis with dips’s software and slope stability analysis using Morgenstern-Price method. Based on the results of kinematic analysis, the percentage value of potential landslides that occurred at the research location was the type landslide which had a landslide Flexural Toppling potential of 18,27%. Based on the analysis of the safety factor (FK) of the slope using Morgenstern-Price method, it shows that the final slope of mining is in a critical condition (FK <1.0) with a FK value of 0.894 in saturated conditions. Therefore, changes in slope geometry were made to obtain safe conditions (FK> 1.3) by reducing the slope angle from 81 ° to 60 ° so that the FK value was 1.326.Keywords: Quarry mining, kinematic analysis, Morgenstern-Price method, FK (safety factor)
Kajian Teknis dan Ekonomis Peledakan di Pit 1 PT. Pebana Adi Sarana Kabupaten Lima Puluh Kota Sumatera Barat Fadhlan Assany; Raimon Kopa
Bina Tambang Vol 6, No 1 (2021): Journals Mining Engineering: Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. PT. Pebana Adi Sarana is located in Jorong Mudik Pasar Manggilang, Pangkalan Koto Baru District, Lima Puluh Kota Regency, West Sumatra Province with an area of 54.74 Ha and has an estimated reserves of andesite stones of 3.925.900 Tons. During the study, the results of blasting were 30% -40% while the desired target was 15% -20%. The purpose of this study is to improve the blasting results in the field by comparing the actual blasting results with the proposed blasting and economic studies by making a comparison of the proposed results against the costs incurred in blasting activities and the use of a breaker. The blasting geometry recommendation of the research method is based on the theory of R. L. Ash and C. J. Konya. The results of the study using actual geometry data showed that the fragmentation results of the Split desktop were 33% and the cost of blasting per tonnage was IDR 6,891/ton. Meanwhile, based on the proposed geometry design with the theory of R. L. Ash and the theory of C. J. Konya, the fragmentation results using Split desktop were 19.37% and the cost of blasting per tonnes was IDR 5,294/Ton. The difference between the cost of the actual geometry and the test geometry is IDR 1.596/TonKeywords : Blasting Geometry, Blasting Fragmentation, Theory of R. L.Ash and C. J. Konya and Blasting Costs
Kajian Teknis Lemparan Flyrock pada Pit 303 Jembayan PT Pamapersada Nusantara Distrik Baya Kabupaten Kutai Kartanegara Kalimantan Timur Asep Triyanda; Raimon Kopa
Bina Tambang Vol 6, No 2 (2021): Journals Mining Engineering: Jurnal Bina Tambang
Publisher : Jurusan Teknik Pertambangan FT UNP

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Abstract. To consider the safe distance of the tool when blasting requires analysis and prediction of flyrock throw. Methods for predicting flyrock throws are Richard & Moore's empirical method and Ebrahim Ghasemi's dimensional analysis. The observation results of the blasting activity were 36 times, and the farthest was 98.87 m of flyrock. The research objective is to analyze the blasting geometry design to better control the flyrock throw, so that the target safe radius of the tool can be reduced from 200 m to 100 m. Prediction of actual flyrock throw using the empirical method Richard & Moore obtained a face burst deviation of 32.68 m, 25.43 m cratering, and 15.12 m rifling, with an error percentage of 69.93%, 30.38%, and 30.64% . Meanwhile, the deviation of Ebrahim Ghasemi's dimensional analysis method is 6.23 m with an error percentage of 9.85%. Based on statistical analysis, stemming has a very strong effect on flyrock throwing, namely 71.40%. Ebrahim Ghasemi's dimensional analysis method is better to predict the actual flyrock throw. To control the actual flyrock throw, a minimum stemming is recommended according to the diameter and depth of the blast hole based on the scaled depth of burial equation, and considering the prediction of a maximum flyrock throw of 50 m and a powder factor not to exceed 0.17 kg / m3. By using these recommendations the safe radius of the tool can be reduced to 100 m with the resulting flyrock safety factor not approaching or exceeding the safe radius of the target, which is 100 m.Keywords: Flyrock, Scaled Depth of Burial, Safe Radius, Stemming
Co-Authors Admizal Nazki Alfisahri Kurniawan Alvi Zichri ALVIN IRANTO PURNAMA An Sosry Andre Tri Wahyudi Asep Triyanda Auaradha Shukura Muji Can Royen Situmorang Dedi Yulhendra Denny Prananda Libriyon Evansharsal Suedi Fadhlan Assany Fariz Aditya Fenny Aulia Gustin Fitri Eka Yulia Franata Halomoan Sinaga Halid candra Heri Prabowo Icksan Lingga Pradana Ika Desmawita Josep L. Marpaung Jufrizal Muhamad iqbal Muhammad Ilham Cahyadi Mulya Gusman Naufal Permanda Osmaini Sutra Haryati Qiratul Aini Rahadiyan Malvin Sunyoto Redy Pratama Resty Prasuryani RIRIN HANRIESTA BR MATONDANG Rizka Anazakia Rudy Anarta Rusli HAR Ryan Markah Sahrul Ramadana Saldy, Tri Gamela Suhendrinal Suhendrinal Sumarya Sumarya Suryadi Suryadi Tamrin Kasim Triliani Utami Tunaiki Harukadol Welly Handa Nuraga Yoszi Mingsi Anaperta Yuri Purwa Agung Hs