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All Journal Journals Mining Engineering : Bina Tambang Jurnal Sains dan Teknologi: Jurnal Keilmuan dan Aplikasi Teknologi Industri

Raimon Kopa

Universitas Negeri Padang

Author-ID : 2720224

Computer Science & IT Earth & Planetary Sciences Engineering Industrial & Manufacturing Engineering

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KAJIAN TEKNIS KEMAJUAN LUBANG BUKAAN YANG OPTIMAL PADA PENAMBANGAN BIJIH EMAS DI PT. DEMPO MAJU CEMERLANG KENAGARIAN TAMBANG KECAMATAN IV JURAI KABUPATEN PESISIR SELATAN PROVINSI SUMATERA BARAT RIRIN HANRIESTA BR MATONDANG; Raimon Kopa; Admizal Nazki
Journals Mining Engineering : Bina Tambang Vol 6, No 1 (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.v6i1.111347

Absract. PT. Dempo Maju Cemerlang is a company focused in the gold mining industry in Indonesia. PT. Dempo Maju Cemerlang uses an underground mining system using the shrinkage method. Underground mining activities at PT. DMC is divided into two activities, namely production and development. Blasting activities play an important role in the mining cycle to unload ore or waste so that it can be taken out of the mining area. This study aims to produce openings as planned by the company with a better progress value. The success of a blasting can be judged by the results obtained. Blasting results at PT. DMC has not yet reached the progress target set by the company, namely 1.5 m / blasting. The average progress of each detonation is 1,216 m, the average actual blasting size is 20 cm, the actual blasting volume averages 4.0699 kg / m3 with an average powder factor value of 1.889 kg / ton, and the amount of explosives which is used for 22 blast holes, namely 20 kg. After designing and testing the recommended blasting geometry, the average progression value is 1.51 m, the resulting fragmentation is also better with an average size of 50 cm, an average volume of 5.0637kg / m3, an average PF value of 1.137 kg / ton, and the amount of explosives used for 22 blast holes is 15 kg. So after testing with the design geometry, an increase in the progress of the blasting hole was obtained by 0.294 m for one blasting, the volume also increased by approximately 0.9938 kg / m3, the PF value of the blasting result was smaller which meant that the fragmentation of the blasting result was more. good and there was a savings in the use of 5 kg of explosives for one front blasting.Keywords: Mine Progress, Blasting, Underground Mining, Blasting Results.

EVALUASI SISTEM PENYANGGAAN PADA TUNNEL 4 BERDASARKAN METODE RMR-SYSTEM DI PT. AICJ, SAWAHLUNTO Alvi Zichri; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 6, No 2 (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.v6i2.111706

Abstract. Excavation of underground rock masses results in changes in the balance of rock conditions such as rock collapse and changes in tunnel dimensions due to shifting of stress distribution. Good geotechnical analysis is desirable to provide proper treatment of the excavated rock.This research was conducted to determine rock mass class, rock mass classification using the RMR method, determine the strength of the rock in tunnel 4 of PT AICJ Sawahlunto, obtain Stand Up Time and span buffer values as references for installing mine pit buffers, obtain appropriate support system recommendations based on the results grounsuppport RMR (Bieniawski 1989) on tunnel 4, Obtaining the condition of the wooden supports used in tunnel 4 of PT AICJ at this time.From the measurement of several parameters of the RMR method, it is obtained that tunnel 4 for coal is in class III (fair rock) with a coal RMR value of 53, and silstone is in class II (good rock) with a value of 61. Based on the stress value received on the cap and side post, namely 502.85 Kg/cm2 and 74.898 Kg/cm2 with the value of the wood clearance stress of 623.75 Kg/cm2 . So that the FK value on the cap and side post tunnel 4 are 1.24 and 8,32. So the tunnel cap 4 is recommended to use wooden supports with a diameter from 20 cm to 21 cm so that the FK value has increased to 1,60 and is declared safe (> 1.5).Keywords: Underground, Rock Mass Ratting, Stress, Safety Factor, Wooden Support.

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

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.

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
Journals Mining Engineering : Bina Tambang Vol 3, No 2 (2018): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

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. Keyword: Production target, limestone crusher, belt conveyor

Analisis Geometri Peledakan Guna Mendapatkan Fragmentasi Batuan yang Diinginkan untuk Mencapai Target Produktivitas Alat Gali Muat Pada Kegiatan Pembongkaran Lapisan Tanah Penutup (Overburden) di Pit Menara Utara, PT. Arkananta Apta Pratista Job Site PT.KPUC, Malinau, Kalimantan Utara Sahrul Ramadana; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 3, No 4 (2018): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Abstract. Overburden digging process at North Tower Pit was carried out by blasting. The results of the observation from the actual blasting geometry carried out by the company in blasting activities, it produces blasting fragmentation which boulder size is ±25%, the effect is diggability of the digging tool is not maximum and productivity target of the tool at 800bcm/hour can not be achieved. This study aims to optimize blasting geometry to minimize the number of boulder so that the loading activities become more effective and productivity target can be achieved. The research method is carried out by giving blasting geometry recomendation based on R.L.Ash and ICI Explossives theories and it is done on the both applications which is carried out in the field so that it get the optimum blast plan. Based on the results of the both applications of blasting geometric plans, it is recommended that the geometry plan of blasting is burden: 5.3m, space: 8.5m, stemming: 4,6m, subdrilling: 1m, bench height: 8m, the depth of explosive hole: 9m, powder colomn: 4.4m, and powder factor: 0.33kg/bcm where the boulder of size fragmentation which is produced 10.82%, digging time is 10.76 seconds, bucket fill factor is 64.56%, and the productivity of the digging tool is 865.44bcm/hour.Keywords: Blasting Geometry, Blasting Fragmentation, Digging Time, Bucket Fill Factor, Productivity of Digging Tool

Analisis Efek Rembesan Air Sungai Lawai terhadap Kestabilan Rencana Lereng dengan Metode Morgenstern-Price pada Low Wall Tambang Air Laya Blok Barat PT. Bukit Asam Tbk, Tanjung Enim, Sumatera Selatan Triliani Utami; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 4, No 3 (2019): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Abstract. Bukit Asam using open pit method. Slopes are one of the most important factors in mining activities. Seepage is considering occur in location of studies in low wall of TAL, there is lawai river at the slope’s peak which can have an effect on the stability of the pit slope then analysis is needed. The analysis use Morgenstern-Price method with geotechnical software. The input data needed consists of rock lining material, material’s permeability, volumetric water content and data of physical and mechanical properties. Analysis of seepage and slope dissociation stability in 3 conditions of the river. The output of analysis are seepage discharge and safety factors. Seepage discharge during dry river is 8,131x10-6 m3/s with F/S 1,259, river conditions in partial height is 2.492x10-4 m3/s with F/S 1,171 and the river conditions in maximum height is 4,792x10-4 m3/s with F/S 1,110. The conclusion is water seepage has an effect on slope stability, the greater the seepage discharge so the smaller the F/S and the smaller the seepage discharge so the greater the F/S. Recommendation is needed by enlarging the slope angle, adding the benchs, cutting peak’s load around 556.43 m2/m and controlling river airflow at maximum height of 6 meters.Keywords: Slope Stability, Factor of Safety, Seepage, Seepage Discharge, Morgenstern-Price

Hasil Uji Block Punch Index (BPI) Untuk Memprediksi Nilai Uniaxial Compressive Strength (UCS) pada Campuran Semen dan Pasir Alfisahri Kurniawan; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 6, No 1 (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.v6i1.111431

Abstract. The world of mining is closely related to rock because most of the minerals are stuck to or in the rock itself. Therefore we need a method and technique on how to separate the mineral from rocks that are not economical. Because rocks have different properties in each type, in this case rock mechanics is needed. One of the tests for the mechanical properties of rock is the uniaxial compressive strength test. UCS is one of the most important and most widely used rock mechanics parameters in rock engineering. To test rocks, samples from the field are needed in the form of solid rock or coring rock. Sometimes there are rocks with a thin layer, causing the coring to crack or break, causing difficulty in sample preparation. One method that arises for the above problem is the Block Punch Index (BPI) test. The Block Punch Index (BPI) test is useful for testing in the field because the tool is easy to carry and the level of accuracy is better than the Point Load Index (PLI) test. The BPI test and the PLI test are both index tests, the difference is that the PLI uses point loading and the BPI uses block-shaped loading. It can be used to determine rock strength values and even to analyze slope stability based on index values and rock strength. Researchers designed a BPI tool for research that is useful for obtaining a graph of the relationship between UCS and BPI. As a result of the research, the following conclusions were made. First, the design of the BPI tool is made based on several components, including an iron pipe with a thickness of 0.5 cm with a diameter of 6 cm and a height of 9 cm. Solid iron in the shape of the letter T with a block punch size of 18 mm. Solid iron with a diameter of 6 cm, a width of 20 mm for the sample break and a depth of 15 mm. Second, the thickness of the sample according to the tool is a sample with a thickness of 10 mm because there are more valid fractures than samples with a thickness of 7.5 mm and 12.5 mm. Third, from the graph of the relationship between BPI and UCS, to predict the value of UCS, you can use the formula y = -0.5164x2 + 4.7167x + 4,8406Keywords : Rock, BPI, Graphics, UCS, and Mechanical Properties

Evaluasi Rancangan Geometri Peledakan Berdasarkan Hasil Fragmentasi Batuan dan Getaran Tanah Pada PT. Koto Alam Sejahtera Kabupaten Lima Puluh Kota Provinsi Sumatera Barat. Muhammad Ilham Cahyadi; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 4, No 1 (2019): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Abstarct. Administratively, the mining location of PT. Koto Alam Sejahtera is located in Jorong Polong Duo, Nagari Koto Alam, Pangkalan Koto Baru, Lima Puluh Kota District, West Sumatra Province.Explosive hole drilling activities at PT. Koto Alam Sejahtera uses the Furukawa Rock Drill PCR200 engine and the explosives used are Pindad ANFO (PANFO).Based on the distribution analysis of rock fragmentation results from actual blasting geometry data, the average rock fragmentation results from blasting (for 4 blasting times) that passed at 60 cm in size with desktop split software was 76,88%.Based on the calculation of ground vibration from the actual data of blasting geometry using the Du Pont / USBM predictor method, the PPV values exceeding 5 mm / s occurred on February 17 and 22 2018, with a PPV value of 6,31 mm / s and 5,76 mm / s.Based on the results of split desktop software analysis, the results of rock fragmentation in the proposed design blasting geometry is 86,22%.Based on the results of the calculation of ground vibration of the Du Pont / USBM predictor method, the value of PPV in the proposed design of II blasting geometry was 4,80 mm / s.Keywords: ANFO, Blasting Geometry, Ground Vibration, Kuz Ram, Rock Fragmentation, USBM Predictor.

PEMETAAN KESTABILAN LERENG PADA LOKASI PENAMBANGAN EMAS PIT DURIAN PT J RESOURCES BOLAANG MONGONDOW SITE BAKAN KECAMATAN LOLAYAN KABUPATEN BOLAANG MONGONDOW SULAWESI UTARA Osmaini Sutra Haryati; Raimon Kopa; Heri Prabowo
Journals Mining Engineering : Bina Tambang Vol 3, No 1 (2018): 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.v3i1.9066

PT J Resources Bolaang Mongondow (JRBM) adalah anak perusahaan PT J Resources Nusantara yang bergerak di bidang usaha pertambangan emas dengan metode tambang terbuka. Operasi produksi PT JRBM saat ini berpusat di site Bakan, Kecamatan Lolayan, Kabupaten Bolaang Mongondow Sulawesi Utara. Selama pengoperasian tambang sejak tahun 2013 telah terjadi beberapa kasus longsor di Pit Durian. Penelitian mengenai kondisi massa batuan terganggu di Pit Durian belum pernah dilakukan sehingga potensi longsor di area pit belum dapat diketahui.Pengamatan langsung di lapangan terhadap bekas bekas longsor menunjukkan bahwa terdapat kontrol struktur yang dominan dalam menghadirkan longsor. Secara geologi, site bakan merupakan zona yang mengalami alterasi hidrotermal. Proses alterasi mempengaruhi komposisi mineral dan kekuatan batuan sehingga secara tidak langsung juga memberikan kontribusi dalam terjadinya longsor. Penelitian ini menganalisis tingkat kestabilan lereng dan tipe potensi longsor yang hadir di Pit Durian serta kaitannya dengan tipe alterasi. Tipe potensi longsor di analisis secara kinematik sedangkan tingkat kestabilan lereng di analisis dengan metode klasifikasi rock mass rating (RMR) dan slope mass rating (SMR).Analisis dilakukan terhadap 102 klasifikasi segmen dan alterasi di pit Durian Tabung 3 pada elavasi 665mRL – 680 mRL. 65% lereng berada dalam kondisi stabil (kelas SMR II), 25% segmen agak stabil (kelas SMR III), 6% tidak stabil (kelas SMR IV) dan 4% sangat tidak stabil (Kelas SMR V). Secara kinematik potensi longsor tipe topling hadir di 44% segmen lereng penelitian, sedangkan tipe planar 18%, tipe wedge 36% dan 35% tidak berpotensi longsor. Hasil analisis menunjukkan bahwa kestabilan lereng pada zona alterasi argilik dikontrol oleh karakteristik massa batuan sedangkan stabilitas lereng pada zona silisik dan argilik lanjut relatif dikontrol oleh struktur.Desain awal rekomendasi perkuatan lereng terhadap lereng yang tidak stabil disarankan berdasarkan Klasifikasi Romana (1985). Re-excavation disarankan untuk lereng yang sangat tidak stabil, pembuatan toe ditch disarankan untuk lereng yang agak stabil, dan sistematic shortcrete atau ekskavasi ulang disarankan untuk lereng yang tidak stabil. Hasil analisis keseluruhan diinterpretasikan dalam bentuk peta kerawanan longsor.

Analisis Stabilitas Lombong (Stope) Blok 1 SOD Level 7 Tambang Emas Bawah Tanah PT. Dempo Maju Cemerlang, Salido, Provinsi Sumatera Barat Muhamad iqbal; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 6, No 1 (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.v6i1.111690

Abstract. Research was conducted at the underground mine of PT Dempo Maju Cemerlang, which is focused in gold mining and is located in Pesisir Selatan Regency, West Sumatra Province. This research focuses on the analysis of the stability of the stope and pillar in mining. Mining activities are carried out with an underground mining system using the method, shrinkage stoping namely mining by creating a level level. Within these levels are made stopes or rooms. The blasted ore is removed as a whole, forming stope an empty. If it is feared that a collapse will occur, and this is undesirable, then the stope can be filled with waste originating from the tailing dump, therefore it is necessary to analyze the safety factor before and after filling the material using the help of software Phase2 with the mohr-coulumb collapse criteria. In detail, the observation area is carried out at Level 7 SOD Block 1 with block dimensions of 30 x 30 m. From the modeling results stope before and after the filling material, the safety factor is obtained from 1.59 to 3.63 so that it is categorized as safe. However, for the pillar safety factor, there is one point that is in critical condition, namely 1.03, so a support system recommendation is needed. For this reason, a simulation of giving is carried out shotcrete with a thickness of 100 mm on a critical pillar to increase the safety factor, so that the pillar safety factor is 1.63 so it is categorized as safe.Keywords: shrinkage stoping, safety factor, pillar, filling material

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 Yoky Febrian Risellino Yoszi Mingsi Anaperta Yuri Purwa Agung Hs

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