Article Per Year (5 Year)
p-Index From 2021 - 2026
1.665
P-Index
This Author published in this journals
All Journal Journals Mining Engineering : Bina Tambang
Raimon Kopa
Unknown Affiliation
Earth & Planetary Sciences

Published : 10 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 10 Documents
Search

 1 
Analisis Pengaruh Geometri Peledakan Terhadap Fragmentasi Hasil Peledakan Dan Digging time Alat Gali Muat Backhoe Caterpillar 6030 Pada Area Pit Limit PT. Semen Padang, Indarung, Provinsi Sumatera Barat Muhammad Tareq Adha; Raimon Kopa
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.v6i4.113688

Abstract

PT. Semen Padang is a mining company that uses the open pit mining method, namely Quarry Side Hill mining, which is a mining method carried out to excavate deposits of industrial minerals or non-metallic minerals. The rock to be transported to the crusher must be blasted first. The results of field observations of the actual blasting geometry applied by the company obtained fragmentation of boulder-sized blasting results with a percentage of ±31%. The large percentage of boulder causes the diggability of the digging tool to be not optimal, where the digging time of the digging tool is not according to the company's target of below 12 seconds. This study aims to design the optimum blasting geometry to reduce the percentage of boulder so that loading activities become effective and the diggability of the digging tool increases. The research method is carried out by providing recommendations for blasting geometry based on the methods of C.J Konya and R.L. Ash. The proposed geometry applied in the field is: burden: 3 m, spacing of 3.5 m, stemming: 3 m, subdrilling: 1 m, ladder height: 8 m, blast hole depth: 9 m, powder column: 6 m, and powder factor : 0.26 kg/ton, where the boulder size fragmentation resulting from the analysis is 11.92%.
ANALISIS PENGARUH PERKUATAN WIRE MESH TERHADAP KEKUATAN PILAR DI TAMBANG BAWAH TANAH DENGAN PENGUJIAN SKALA LABORATORIUM Aldo Azzana Zuhuri; Raimon Kopa
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.v6i5.115163

Abstract

Abstract. Pillars are natural support that serve to hold the material load on it. The development of deeper mines causes the burden received by the pillars will be greater so as to encourage an increase in the dimensions of the pillars to maintain the stability of the work area this will be a challenge to carry out the mandate of Annex VII of the Decree of the Minister of Energy and Mineral Resources No. 1827.K/30/MEM/2018 on Guidelines for the Implementation of Mineral and Coal Conservation. Therefore the pillar requires special reinforcement so as not to collapse during underground mining activities and also maximize recovery. In this study the reinforcement used is wire mesh with a diameter of 0.8 mm then the pillar sample is made of a homogeneous cylindrical material from a mixture of cement and sand with a composition of 1:2, the pillar sample is made close to the strength of coal. The results of this study showed that the installation of strengthening (wiremesh) caused an increase in the strength value on the pillar that was originally a pillar without buffering has a strong uniaxial press of 10.4 MPa and after strengthening the wire mesh obtained 14.65 MPa or increased by 42.5%. This is evidenced by the results of numerical modeling model II shows an increase in strength factor value from the original 1 to 1.3 and decreased horizontal displacement that was originally as far as 0.00024 m to 0.000063 m, the results of pillar strength testing in the laboratory and numerical modeling showed that the increase in strength occurred due to horizontal displacement in the pillar held by wire mesh so that the pillar seemed to experience pressure. Anchoring thus causes horizontal displacement to be smaller compared to horizontal displacement on pillars without wire mesh strengthening.
Analisis Kestabilan Lereng Pada Rencana Lereng Akhir Penambangan Dengan Tinggi 55 m PT. Atika Tunggal Mandiri, Kecamatan Pangkalan Koto Baru,Sumatera Barat andre martona risky; Raimon Kopa
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.v6i4.114035

Abstract

PT. Atika Tunggal Mandiri is a company engaged in the andesite mining business in kabupaten Lima Puluh Kota. In open pit mining, the stability of the mine slope is the most important factor that must be considered in thesustainability of mining activities. The author conducted research at the site of the final mining slope of PT. ATM, with anactual slope height of 13 m and a slope angle of 85°. The final slope of the mine will increase in height, this is due to theexcavation of andesite material to a depth of 55 m. Therefore, it is necessary to review the stability of the slope so that t heslope does not collapse and does not cause losses to the company.In this study, the analysis used is kinematic analysis with dips software and slope stability analysis using the Finite Elementmethod with phase 2 software. which has a landslide potential of 23.37% (Flexural Topling of 12.68% while Direct Toplingof 10.59%). Second, the results of the analysis of the factor of safety (FK) of the slope using the Finite Element method onthe actual slope of 13 m with an angle of 85° are 2.12 (natural condition) and 2.09 (saturated condit ion). Third, to get a safeFK which is 1.30 by making a double bench with a height of 55 m with an overall angle of 65° (the height of the first singleslope is 20 m with an angle of 85° while the second single slope is 35 m with an angle of 65°). FK values obtained are 1.33(natural condition) and 1.31 (saturated condition). Fourth, it is preferable to write a triple bench with a height of 55 m withan overall angle of 70° (the height of the first single slope is 20 m with an angle of 85°, the second single slope is 20 m withan angle of 88° and the third single slope is 15 m with angle of 88°) obtained FK values are 1.35 (natural condition) and 1.33(saturated condition).
Kajian Teknis Geometri Peledakan Berdasarkan Analisis Blastability Index dengan Perhitungan RL Ash combine Vertical Energy Distribution (VED) Pada Penambangan Batu Kapur di Area 15.15 PT Semen Padang Bukit Karang Putih Kecamatan Lubuk Kilangan Kota Padang Fadel Muhammad; Raimon Kopa
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.v6i4.113942

Abstract

Dalam kegiatan peledakan ada beberapa macam indikator keberhasilan dari peledakan itu sendiri, antara lain tercapainya target produksi dan ukuran fragmentasi ideal yang ditetapkan pihak perusahaan. Untuk mendapatkan target produksi dan ukuran fargmentasi yang baik tersebut maka peran geometri peledakan menjadi parameter penting yang perlu diperhatikan. Penentuan geometri peledakan mulai dari burden, spasi, panjang kolom isian, stemming, tinggi jenjang, subdrilling, dan kedalaman lubang ledak serta powder factor yang dirancang harus memperhatikan karakteristik massa batuan dan distribusi energi bahan peledak yang digunakan. Berdasarkan pengamatan yang penulis lakukan di PT. Semen Padang di area 15.15, penulis melihat beberapa peledakan menghasilkan fragmentasi batuan yang dikategorikan boulder (>80 cm) hampir 30%. Padahal target yang diharapkan yaitu maksimal ukuran fragmentasi 80 cm, agar batu kapur yang telah diledakan dapat melewati crusher. Selain dari itu, beberapa dari hasil peledakan ditemukan retakan saja, sehingga digging time dan cycle time excavator menjadi lama dan produktivitas alat menurun serta mengakibatkan target produksi tidak tercapai. Untuk mendapatkan ukuran fragmentasi yang diharapkan perusahaan dan target produksi bisa tercapai, maka dilakukan perancangan geometri peledakan yang dikaji berdasarkan analisis blastability index batuan dengan menggunakan perhitungan metode RL Ash combine metode Vertical Energy Distribution (VED). Berdasarkan dari rancangan RL Ash didapatkan burden 4 m ; spasi 5 m ; kedalaman 10,5 m ; tinggi jenjang 9,5 m ; subdrilling 1 m dan powder factor 0,36 kg/m3. Dari rancangan Vertical Energy Distribution terdapat lima rekomendasi diantaranya VED 66 %, VED 70%, VED 73%, VED 75% dan VED 77%. Dari lima rekomendasi tersebut penulis memilih VED 70%  dengan isian setinggi 7,3 m dan stemming 3,2 m serta didapatkan prediksi fragmentasi tidak lolos ukuran 80 cm menurut Kuzram 1,2 % dan 5,1% menurut prediksi splitdesktop.
EVALUASI KESTABILAN LERENG PADA LUBANG BUKAAN SAPAN DALAM 02 PT. NUSA ALAM LESTARI DI DESA SALAK, KECAMATAN TALAWI, KOTA SAWAHLUNTO, PROVINSI SUMATERA BARAT Pradera Junira; Raimon Kopa
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.v6i4.114163

Abstract

PT. Nusa Alam Lestari merupakan salah satu perusahaan yang bergerak dibidang pertambangan dan telah berinvestasi di Kota Sawahlunto. Bahan galian yang telah ditambang adalah batubara. Secara administrasi lokasi penelitian eksploitasi tersebut berada di Kecamatan Talawi, Kota Sawahlunto, Provinsi Sumatera Barat dengan luas 94,20 Ha. Jenis material pembentuk lereng adalah claystone dengan geometri lereng yang memiliki tinggi 45,5 meter dan memiliki kemiringan adalah 74o . Maka dari itu adanya rancangan geoteknik pada lereng sapan dalam 02 PT. Nusa Alam Lestari. Data hasil pengujian sifat fisik dan mekanik batuan claystone mendapatkan nilai bobot isi asli 20,45 KN/m3 , nilai bobot isi jenuh 24,62 KN/m3 , dan nilai bobot isi kering 16,93 KN/m3 , kohesi (c) = 55,7 MPa dan sudut geser dalam (ϕ) =47,82o . Analisis nilai factor keamanan (FK) dan rekomendasi geometri lereng menggunakan metode Janbu Simplified. Hasil dari penelitian yaitu, yang terjadi pada area PT. Nusa Alam Lestari Sapan Dalam 02 yaitu berupa longsoran baji (wedge sliding) dengan tingkat kelongsoran 73,03% dengan arah longsoran N81o /E64o . Maka dari itu dilakukan rekomendasi lereng tunggal dari lereng keseluruhan dengan ketinggian 22,75m dan kemiringan 74o dan faktor keamanan (FK) dalam keadaan natural adalah sebesar 1,558 dan faktor keamanan (FK) dalam kondisi jenuh adalah sebesar 1,415 dan faktor keamanan (FK) dalam kondisi kering adalah sebesar 1,725 dan lereng keseluruhan double bench dengan ketinggian 45,5m dan kemiringan lereng 63o dan faktor keamanan (FK) dalam keadaan natural adalah sebesar 1,404 dan faktor keamanan (FK) dalam kondisi jenuh adalah sebesar 1,315 dan faktor keamanan (FK) dalam kondisi kering adalah sebesar 1,512. Maka di dapatkan geometri lereng pada overal double bench dengan tinggi 45,5m, lebar bench 10m dan dengan sudut 630 mendapatkan nilai FK >1,3 (kondisi aman). Dan lereng tunggal pada lereng overall double bench dengan tinggi 22,75m, lebar bench 10m dan dengan sudut 74o mendapatkan nilai FK > 1,3. Dan di dapatkan FK lereng pada keadaan jenuh FK 1.315, pada keadaan kering FK 1.512, pada keadaan natural 1.404, oleh karena itu penulis merekomendasikan lereng keseluruhan double bench karena nilai FK yang aman.
Slope Stability Analysis at Pit 1 Limestone Mining PT Anugrah Halaban Sepakat, Lareh Sago Halaban Sub-District, Lima Puluh Kota Regency, West Sumatra Province Juni Pratama; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 7, No 2 (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.v7i2.119027

Abstract

PT Anugrah Halaban Sepakat is one of the companies engaged in the mining sector and has invested in Fifty Cities Regency, West Sumatra Province. PT Anugrah Halaban Sepakat has two pits (pit 1 and pit 2), the slope characteristics of pit 1 are composed of homogeneous clay material which tends to be sticky in wet conditions, hard and cracked in dry conditions, has a geometry of 20 meters high. and a slope of 66°, which was made without taking geotechnical studies into account. Based on this, it is necessary to plan the research slope well so that the soil slope is in a stable condition. From the results of research and analysis carried out, the value of geotechnical parameters after testing the physical and mechanical properties of the slope material is the natural density of 15,77 kN/m3, the dry density of 14,14 kN/m3, and the saturated weight of 19,06 kN/m3. The cohesion value is 39,79 kN/m3, and the internal shear angle is 21,25°. The actual FK value in natural state using Bishop's method is 1,099, in dry state is 1,177 and saturated state is 0,985. Then the actual FK value using the Hoek and Bray method in dry conditions was obtained at 1,051 and in a saturated state of 0,720. The results of the analysis after modifying the single slope geometry from a slope of 66o to 46o, the FK value in the dry state is 1,562 and the saturated state is 1,319 by dismantling the soil as much as 4.262,076 m3. Then the results of the analysis after modifying the geometry of the overall slope made two single slopes each with a height of 7 and 13 meters and a bench width of 10 meters having a slope of 50o, the FK value in a dry state was 1,550 and in a saturated state of 1,315 by dismantling 2.514,35 m3 of soil.
Analisis Kestabilan Lereng Lowwall Section A dan Section B Pit Middle Menggunakan Limit Equilibrium Method (Morgenstern-Price) di Tambang Terbuka PT. Banjarsari Pribumi, Kecamatan Merapi Timur, Kabupaten Lahat, Sumatera Selatan M Iqbal Alfidqi Fauzi; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 7, No 2 (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.v7i2.118984

Abstract

This study focuses on the Lowwall Pit Middle Slope which is divided into 2 Sections, namely Slope Section A and Slope Section B. In the crest section of the slope there is a disposal area. From the results of field observations, water seepage was found at RL ± 40 mdpl and RL ± 70 mdpl. In addition, cracks were found at RL±90 mdpll and RL±100 mdpl in the disposal area. The impact of this finding is the landslide that occurred on the Lowwall Section A Slope. In addition, the high rainfall at PT. Banjarsari Pribumi causes the value of cohesion and shear angle in the material making up the slopes to decrease. The method used in analyzing the stability of the Lowwall Pit Middle Slope is the Limit Equilibrium (Morgenstern-Price) method which is applied in slide 6.0 software. The analysis was carried out based on the topography of December 2021. The results of the stability analysis of the Lowwall Pit Middle Slope for Section A obtained that the saturated FK was 1.072 and the saturated FK Section B was 1.192. From the analysis results obtained, it is explained that the Lowwall Pit Middle Slope is in a critical condition. For this reason, the authors carry out simulations of actual slope dewatering and simulation of resloping + dewatering of the Lowwall Pit Middle Slope. The results of the 5 m dewatering simulation for section A obtained the FK value of 1,352 and for section B of 1,306. The results of the resloping + dewatering simulation for section A obtained the FK value of 1.542 and for section B of 1.384.
Analisis Stabilitas Lereng Pada Kegiatan Galian Clay Pada Tambang IUP OP Jumaidi, Kelurahan Gunung Sarik, Kecamatan Kuranji, Kota Padang, Sumatera Barat Muhammad Reyhand; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 7, No 2 (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.v7i2.118990

Abstract

IUP OP Jumaidi is one of the mining business licenses engaged in mining, especially clay mining and trading, which is located in Gunung Sarik Village, Kuranji District, Padang City, West Sumatra Province. Based on field observations at the IUP OP Jumaidi, the authors found that there are manufactured slopes or former mining slopes consisting of slope-forming material, namely clay, with a slope geometry of 44 meters high and a slope of 45o. The existence of mining activities, such as excavation, and transportation of material on the slopes forms the final slope (ex-mining slope) whose stability is not yet known, so it is feared that there will be a landslide hazard. The collapse of the slope in the horizontal plane adjacent to the access to the mining deposit area in 2022 could disrupt mining activities in the IUP OP Jumaidi. The method used in this study is the Bioshop Simplified with a standard safety value of > 1.3. The results of testing the physical properties and mechanical properties of the slopes are the natural bulk density of 16.33 kN/m3, the dry bulk weight of 12.45 kN/m3 and the saturated weight of 17.25 kN/m3. Meanwhile, the cohesion value is 41,256 kN/m3 and the internal shear angle is 25,09o. Based on the parameter values of the physical and mechanical properties of soil in the laboratory, the safety factor value according to the Bioshop Simplified in natural conditions is 1.027, while the safety factor value of the Hoek and Bray in dry conditions is 1.17 and for saturation condition of 0.93. The results showed that the FK value obtained a single slope geometry recommendation with a slope of 35o with a safety factor (FK) of 1.377 in natural conditions according to the bioshop. While the value of the safety factor (FK) in the saturated condition is 1.350. And the double slope according to the Bishop method, the factor of safety (FK) in the natural state is 1.341, and the value of the safety factor (FK) in the saturated condition is 1,309.recommended to use a double slope slope with a bench width of 16 meters and a slope of 39o. The volume to be peeled is 29034.79 bcm.
Evaluasi Kestabilan Sistem Penyangga pada Tambang Bawah Tanah Menggunakan Rock Mass Rating (RMR) pada Lubang Tambang Tambang Batubara BMK-30 CV. Bara Mitra Kencana Kec. Talawi, Kota Sawahlunto. William Putra Simbolon; raimon kopa
Journals Mining Engineering : Bina Tambang Vol 8, No 2 (2023): 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.v8i2.125177

Abstract

There are cracks and flaws in the wood that do not match the strength of the surrounding rock. There is a spacing between supports that exceeds the SOP of 2.5 m-2.8 m, which violates the company’s SOP of 1 m-1,5 m. The company does not have a buffer design appropriate for the rock load. In this study, the authors used quantitative research methodology. Quantitative research is research by obtaining data in the form of number or summarized qualitative data (Sugiyono, 2018:8). In conducting this research, there are primary data obtained directly from the field, namely the geometry of the opening hole, the dimensions of the wood support the condition of the discontinuous plane, the point load index value of the rock, the compressive strength value of the wood. A. the average value of saturated content weight of coal is 1.330 gr/cm3 and siltstone has a saturated content weight of 2.506 gr/cm3. B. the average value of point load index of coal is 0.246 MPa and siltstone has an average point load index of 0.837 gr/cm3. C. the results of converting PLI values to UCS, coa; has an average UCS value of 2,90MPa and siltstone has an average UCS value of 9.890 MPa. Based on the weighting of rock mass classes using the RMR system method, the results show that the right and left wall rock mass class, which is coal, has a value of 56 and includes class III rocks, and siltstone rocks are included in class II rocks as roofs. The standing time value of the roof opening hole section is 7,000 hours or for 291.67 days and the span with the provision of 4 meters of progress based on the specifiend RMR. From the wood specific gravity test, the average value of wood specific gravity is 0.51, which indicates that the wood used by CV. Bara Mitre Kencana is in class III. And for the bending strength value of wood of 623.75 kg/cm3. From the above calculations, the FK cap value is obtained after evaluating the distance between the supports. From the results of the above analysis, the FK value ≥1.5 is obtained with a support distance of 1.38 m.Keywords:  Evaluation, Geometry, Faulting, Rock Weighting, Opening Geometry
Analisis kestabilan lubang bukaan menggunakan q-system pada penambangan bawah tanah PT.Cahaya Bumi Perdana Sawahlunto dinda apriko harli; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 8, No 3 (2023): 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.v8i3.126360

Abstract

A mining method where all activities are carried out below the earth's surface is called underground mining. Underground mining activities can cause collapses, to prevent this from happening by analyzing the stability of openings using the Q-System method. The parameters used to find the Q value are rock quality designation, joint set number, joint roughness, joint alteration number, stress reduction factor. Look for the value of the tunnel safety factor and also the value of the meanstress acting on the tunnel BT-03 Value the tunnel and also the voltage acting on the BT-03 tunnel using phase2 software. The results obtained include the Q-System value for coal is 1.8 and sandstone is 1.6, The tunnel safety factor value is 0.9, which means the tunnel is in an unstable condition so it is necessary to install supports.The minimum voltage value working on tunnel BT-03 is 2.00 while the maximum voltage is 3.50.
Co-Authors Aldo Azzana Zuhuri andre martona risky dinda apriko harli Fadel Muhammad Juni Pratama M Iqbal Alfidqi Fauzi Muhammad Reyhand Muhammad Tareq Adha Pradera Junira William Putra Simbolon