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

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Kajian Geometri Peledakan untuk Mendapatkan Fragmentasi Yang Optimal Pada Penambangan Batu Andesit PT. Atika Tunggal Mandiri Kabupaten 50 Kota Provinsi Sumatera Barat Yuri Purwa Agung Hs; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 5, No 5 (2020): 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.v5i5.109985

Abstract

Abstract. Andesite Mining at PT. Atika Tunggal Mandiri with a surface mining system with the Quarry mining method. The percentage of boulder-sized blasting fragmentation produced at this time in the field is 38.19%. As a result, the diggability of the digging tool is not optimal and the excavation tool productivity target planned by the company is 80 bcm / hour not achieved. This study aims to design a new blasting geometry to obtain optimal fragmentation results so that loading activities are effective and productivity targets are achieved. The research method was carried out by providing recommendations for blasting geometries based on R.L. Ash and C.J. Konya and carried out the application of one of the blasting geometry designs in the field so that the optimum blasting geometry design was obtained from one of the blasting geometry designs to be applied in the future for the company. The basis of the results of the application in the field to one of the proposed blasting geometry designs, namely: Burden: 2 m, spacing: 2 m, Stemming: 1.4 m, Subdrilling: 0.6 m, level height: 3 m, blast hole depth 3.5 m, powder coloum: 1.5 m, and powder factor: 0.68 kg / m3 where the fragmentation of the boulder size resulting from the split desktop software analysis is 0% and digging time is 9.61 seconds.Keywords : Blasting Geometry, Blasting Fragmentation, Digging Time, Bucket Fill Factor
Analisis kestabilan Terowongan SOD level 7 pada tambang bijih emas bawah tanah Di PT. Dempo maju cemerlang pesisir selatan Halid candra; 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.v6i1.111692

Abstract

Abstract. PT. Dempo maju Cemerlang is a company operating in the gold mining sector. Gold mining of PT. Dempo maju cemerlang using an underground mining system with the skrinkage method. Mining is carried out by tunneling the main entrance and access to the ore deposits . So that tunnel enlargement activities are carried out to facilitate access to the location and transportation of mining products. So that the tunnel causes a decrease in the safety factor from 3,576 to 1,772 so it is necessary to install a buffer system. The support system must be carefully determined so that its use is optimal , at the SOD level 7 location, the depth of 500- 510 meters has not been used. So that the installation of a buffer will be carried outsplit setaccording to the total collapse load obtained from the tunnel. Analysis needs to be done to determine the condition and rock mass class and to determine the proper installation of supports to the tunnel. The RMR value ranges from 49 - 59, which means the rock mass is categorized into class III rock (f air rock). The support for the split set that must be installed in the tunnel is 3 split sets per meter so that the security factor of the tunnel is stable, meaning it is in accordance with the expected safety factor. Keywords: Tunnel, Safety Factor, RMR-System, Ground Suppor
Analisis Pengaruh Penguatan Rockbolt Terhadap Kekuatan Pilar Persegi Di Tambang Bawah Tanah Dengan Pengujian Skala Laboratorium. Jufrizal .; 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.v6i5.115127

Abstract

Abstract. In underground mining using the room and pillar method, one way to increase the strength of the pillars is to use rockbolt reinforcement, where rockbolt reinforcement can be used if the pillar consists of compact rock, not too soft and not too hard. Because rockbolt has a significant effect on pillars, this study aims to analyze the effect of rockbolt reinforcement on square pillars by using laboratory testing of the physical and mechanical properties of pillar samples and performing numerical modeling of unreinforced and rockbolt-reinforced pillar samples. From the results of the study, it was found that the pillars without reinforcement showed an average strength value of 10.73 MPa, while the pillars with rockbolt reinforcement showed an average strength value of 12.70 MPa, so that the addition of rockbolt reinforcement showed an increase in pillar strength of 18.36%. Pillar modeling without reinforcement shows a strength factor value of 1,05, while pillar modeling with rockbolt reinforcement shows a strength factor value of 1,2, so there is an increase in the strength factor value of 14,3 %. Pillar modeling without reinforcement shows a horizontal displacement value of 5,8x x    m, while pillar modeling with rockbolt reinforcement shows a horizontal displacement value of 2,2  x   m, so there is decrease in horizontal displacement value by 37,93 %.Keywords : Pillar, Rockbolt, Physical Properties, Mechanical Properties, Modeling.
ANALISIS GETARAN TANAH (GROUND VIBRATION) HASIL PELEDAKAN OVERBURDEN DI SITE TAMBANG AIR LAYA SELATAN PT. BUKIT ASAM (PERSERO), TBK TANJUNG ENIM SUMATERA SELATAN Can Royen Situmorang; Raimon Kopa; Sumarya Sumarya
Journals Mining Engineering : Bina Tambang Vol 2, No 1 (2015): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (570.68 KB) | DOI: 10.24036/bt.v2i1.5278

Abstract

Ground vibration effect directly caused by blasting activities. This effect can be negative value if hedamaged against the influence of the wall bech or building structures. To generate a safe blasting necessary measurements of ground vibration against vibration resulting from blasting so that each can be known maximum number of explosives are best used for a certain distance. By analysis the peak particle velocity and scale distance then it can be determined the value of the peak particle velocity that’s safe and appropriate for the conditions of the surrounding rocks. Blasting activities carried out at PIT south mine air laya PT. Bukit Asam (Persero) Tbk with a pattern of blasting hole by hole, using a surface delay detonator 109 ms, 42 ms and in hole delay detonator 500 ms. Blasting is not done with one explosion, but rather is done gradually or made into some Initiation Point (IP) blasting alternately after done checking. The system uses non-electric and triggers the initial explosion in the form of electric detonators connected to the blasting machine using lead wire. The results of the measurement of the soil vibration obtained PPV average actual 1,72 mm/s, PPV the average regression analysis (prediction) 1,64 mm/s. For geting value PPV 2 mm/s at a distance of 500 m maximum field required as much 57,594 kg of ANFO. The use of blasting method with long period dalay, blasting made into some IP and Line Drilling is already effective and economical to reduce vibration Standard PT. BA PPV 2 mm/s and the SNI 7571 PPV 3 mm/s.
Evaluasi Hasil Peledakan Overburden menggunakan Metode TOPSIS pada Tambang Terbuka PT Pamapersada Nusantara Jobsite TOPB Kalimantan Tengah Auaradha Shukura Muji; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 4, No 1 (2019): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.101 KB) | DOI: 10.24036/bt.v4i1.104534

Abstract

Abstract. Blasting is an important operations in mining. The explosion carried out by PT Pamapersada Nusantara Jobsite TOPB was an activity involving ANFO explosives. The improper selection of blasting geometry will create a problem with blasting results, such as rock fragmentation with a lot of boulders, flyrock, high ground vibrations, high air blasts, long digging time and high powder factor values. Based on the problems that arise, choosing the right blasting geometry will certainly be needed. Selecting the right blasting geometry can be done using the Multi Criteria Decision Making (MCDM). TOPSIS is one method that can be used in decision making. In determining the right geometry using this TOPSIS, safety and technical parameters are taken into consideration. Finally, Based on the blasting classification obtained from the average Ci* value of twenty available alternatives, the blasting results are categorized as good with a value 0.298 (class II). The most suitable blasting geometry for PT Pamapersada Nusantara Jobsite TOPB from evaluation using TOPSIS is a burden of 6.5 m, spacing of 7.5 m , drill hole diameter of 20 cm, subdrill of 0.5 m, hole depth of 7.25 m and  stemming of 4.3 m.Keywords:  Blasting, Blasting Geometry, Multi Criteria Decision Making (MCDM), Overburden, TOPSIS
Analisis Kestabilan Lereng BT 02 Jalan Masuk Tambang Bawah Tanah PT. Nusa Alam Lestari di Desa Salak, Kecamatan Talawi Kota Sawahlunto, Provinsi Sumatra Barat Rizka Anazakia; Raimon Kopa
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.v6i3.112577

Abstract

PT. Nusa Alam Lestari is a company which engaged in coal mining business in Sawahlunto City.The level of mine slope stability is the most important factor that must be considered in the sustainability of mining activities. The writer conducted a research at the mining slope location of PT. NAL, which is at the coordinates of S00˚43'27,0 "/ E100˚47'11,1" with slope height 38m and slope 81˚.In this study, the writer used kinematic analysis with dips software and slope stability analysis using the Finite Element method. Based on the data from the kinematic analysis, the percentage value of potential landslides that occur at the research location is the plane failure which has a landslide potential of 25.37%. Second, the results of the analysis of the safety factor (SF) of the slope using the Finite Element method show that the results of the single slope analysis of the actual value obtained are SF = 1.22 (natural conditions) and SF = 0.88 (saturated conditions). Third, to obtain a safe SF, namely 1.25, a change in the geometry of the slope was carried out by reducing the slope angle from 81 ° to 72 ° in saturated conditions so that the SF value 1.25.Keywords: Open Mining, Slope Geometry, Finite Element Method, Safety Factor
Analisis Kestabilan Lereng Studi Kasus Kelongsoran Ruas Jalan Sicincin-Malalak KM 27.6 Kecamatan Malalak, Kabupaten Agam Qiratul Aini; Raimon Kopa; Rusli HAR
Journals Mining Engineering : Bina Tambang Vol 3, No 2 (2018): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (831.248 KB) | DOI: 10.24036/bt.v3i2.10109

Abstract

Badan Penanggulangan Bencana Daerah Kabupaten Agam, Sumatera Barat, menyatakan sekitar 65.068 dari 519.000 warga Agam berada dan tinggal di lokasi rawan tanah longsor. Salah satu kejadian longsor di Kecamatan Malalak (2017), mengakibatkan penutupan ruas jalan alternatif Sicincin-Bukittinggi. Selain itu, terdapatnya titik yang rawan terhadap longsor yaitu pada titik S 0° 22.314' dan E 100° 17.339 dengan elevasi 1212 mdpl.Penelitian ini merupakan penelitian terapan (applied research) dengan metode kuantitatif. Analisis kestabilan lereng dibantu dengan software tambang. Data yang digunakan adalah data primer yang terdiri dari data sifat fisik tanah yaitu: kadar air tanah, bobot isi tanah, dan spesific gravity, data kuat geser tanah dimana uji kuat geser tanah akan menghasilkan nilai kohesi (c) dan sudut geser dalam tanah (????), tinggi lereng (m), sudut kemiringan lereng (˚) dan ketebalan tiap lapisan tanah pada lereng penelitian(m). Sedangkan untuk data sekunder terdiri dari Peta Geologi, Peta Hidrogeologi, data curah hujan, Peta Topografi Kabupaten Agam dan Peta Zonasi Gempa Indonesia.Hasil analisis menunjukkan nilai faktor keamanan lereng aktual tanpa memasukkan nilai getaran gempa pada kondisi kering adalah 1,388, kondisi asli adalah 1,040 dan pada kondisi jenuh adalah 0,755. Kemudian nilai faktor keamanan lereng dengan memasukkan nilai faktor getaran gempa pada kondisi kering nilainya 0,742, pada kondisi asli nilainya nilainya 0,599 dan pada kondisi jenuh 0,340. Dari hasil analisis kestabilan lereng menunjukkan bahwa pada saat lereng tidak dipengaruhi nilai faktor getaran gempa nilai faktor keamanannya pada kondisi asli dan jenuh tidak aman karena nilainya <1.25, sedangkan saat kondisi kering lereng tersebut dalam keadaan stabil. Sedangkan jika lereng dipengaruhi getaran gempa didapatkan pada semua kondisi lereng stabil. Kemudian, penulis merekomendasikan untuk perbaikan stabilitas lereng dengan mengubah kemiringan lereng dari 61˚ menjadi 42˚ pada kondisi tanpa memasukkan nilai getaran gempa dapat menaikkan nilai FK lereng nilainya yaitu 1.403, dimana menurut Joseph E. Bowles (1984) lereng tersebut sudah pada kondisi aman.Kata kunci: analisis kestabilan lereng, faktor keamanan, getaran gempa
Analisis Geometri Lereng Pada Ruas Jalan Sicincin-Malalak KM 33 Kecamatan Malalak Kabupaten Agam Provinsi Sumatera Barat Welly Handa Nuraga; Raimon Kopa; Rusli HAR
Journals Mining Engineering : Bina Tambang Vol 3, No 3 (2018): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1117.679 KB) | DOI: 10.24036/bt.v3i3.101430

Abstract

The slope geometry stability on the Sicincin-Malalak road section on KM 33 was analyzed using the limit equilibrium method by using mining software and then manually calculating the slope safety using the Fellenius method and testing using Hoek and Bray diagrams (1981). Type of the failure on the hill in KM 33 was an arc landslide (circular failure) because the landslide on the slope forms is a semicircle. Determination of the safe or not slope in the study location is guided by the Decree of the Minister of Public Works in 1987. Who proposes the road slope can be declared safe if it has a slope safety value without an earthquake above 1.35. As for conditions with earthquakes, the safety value of the slope must be above 1.2. Trial slope testing at the study site was carried out by slope slope every 5 ° from the slope of the 49 ° slope. The slope is then assumed under various conditions, it was dry, natural, saturated, and earthquake for slope of 44 °, 39 ° and 34 °. After analyzing and calculations using various methods, the slope with a 34 ° slope is a recommendation because it has a security value above 1.35 for conditions without earthquakes, the slope length is 31.625 m and the slope is declared safe. The results of the tests are expected to be recommendations for preventing landslides.Keywords:  Slope Stability, Safety Factor, Circular Failure,  Mining Software, Fellenius Method, Hoek and Bray Method
ESTIMASI SUMBERDAYA BATUBARA TERUKUR DI BLOK TIMUR IUP PT. SAROLANGUN PRIMA COAL, KABUPATEN SAROLANGUN, JAMBI Icksan Lingga Pradana; Raimon Kopa; Dedi Yulhendra
Journals Mining Engineering : Bina Tambang Vol 1, No 1 (2014): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (557.744 KB) | DOI: 10.24036/bt.v1i1.3436

Abstract

ABSTRAKDaerah penelitian adalah Blok timur Wilayah Izin Usaha Pertambangan PT.Sarolangun Prima Coal dengan luas 1024 Ha. Metode yang digunakan untuk mengestimasi sumberdaya batubara di daerah penelitian adalah metode Cross Section dengan pedoman perubahan bertahap (Rule of Gradual Change) dan dengan pedoman titik terdekat (Rule of Nearest Point). Prinsip dari  metode Cross Section Rule of  Gradual  Change, yaitu  dengan  menghubungkan  titik pengamatan terluar, endapan batubara dianggap sama sepanjang garis lurus tehadap penghubung 2 (dua) titik. Sedangkan pada metode Cross Section Rule of Nearest Point, yaitu berpedoman pada titik terdekat, dengan membuat batas terluar endapan secara linear, panjang garis linear sama dengan batas blok, setengah jarak antara dua titik.Berdasarkan penaksiran sumberdaya batubara dengan menggunakan metode Cross Section dengan pedoman perubahan bertahap (rule of gradual change) dengan jarak antar sayatan 100 meter dan diperoleh sumberdaya batubara terukur (Measured Coal Resource) seam A dan  seam B adalah sebesar  28.304.358,40  Ton.  Volume overburden  dan  interburden  yang  didapatkan adalah sebesar 182.835.816 Bcm dengan  Stripping Ratio(SR) 6 : 1. Metode Cross Section dengan pedoman titik terdekat (rule of nearest point) dengan jarak antar sayatan sebesar L1 50 meter dan L2 50 meter diperoleh sumberdaya batubara terukur (MeasuredCoal Resource) seam A dan seam B adalah sebesar 29.232.773,1 Ton, serta volume overburdendan interburden yang didapatkan adalah sebesar 189.104.302,6 Bcm. dengan Stripping Ratio(SR) 6 : 1.ABSTRACTThe  research  area  is  at  the  Region  east  block  of  Licensed  Mining  Company  of  PT. Sarolangun  Prima Coal with area of 1024 Ha. The method being used to estimate the coal resource at the research area is Cross Section method with Rule of Gradual Change and with Rule of Nearest Point. The principle of   Cross Section Rule of Gradual Change method is by relating the outermost observation points, the coal deposits considered to be the same throughout straight line connecting the two points. Whereas, at the Cross  Section Rule of Nearest Point method, which is based on the nearest line, it is by making the outer boundary deposit linearly, where the length of the linear line is the same as the block boundary, it is a half distance between two points.Based on the coal estimation using Cross Section Rule of Gradual Change method with the distance between slices is 100 metres, the Measured Coal Resource of seam A and seam B is as big as 28.304.358,40 Tons. The acquisited overburden and the interburden volumes are as big as 182.835.816 Bcm with 6:1 Stripping Ratio (SR). Cross Section Rule of Nearest Point method where the distance between slices of L1 is 50 meters and L2 is 50 meters, a Measured Coal Resource of seam A and seam B can be acquisited as big as 29.232.773,1 Tons. The obtained overburden and interburden volumes are as big as 189.104.302,6 Bcm with 6:1 Stripping Ratio (SR)Kata kunci: Sumberdaya Batubara, Metode Cross section, Stripping Ratio
Evaluasi Sistem Penambangan Coking Coal untuk mencapai nilai Crucible Swelling Number (CSN) 3-7 di Pit Haju PT Pamapersada Nusantara Jobsite Adaro Met Coal di Kalimantan Tengah Fariz Aditya; Raimon Kopa
Journals Mining Engineering : Bina Tambang Vol 3, No 3 (2018): Journals Mining Engineering: Bina Tambang
Publisher : Departemen Teknik Pertambangan FT UNP

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1284.552 KB) | DOI: 10.24036/bt.v3i3.101410

Abstract

PT Pamapersada Nusantara Jobsite Adaro Met Coal is one of the company's pilot projects in world-class coking coal mining. The right technology and coking coal mining system must be implemented because the quality produced greatly affects the customer's trust. Coking coal is a type of coal that is used as a fuel as well as a reducing agent in the iron / steel industry. One important indicator in distinguishing the quality of coking coal with thermal coal types is the CSN (Crucible Swelling Number) test. Coking coal must have a CSN value of at least 3. Coking coal can decrease in quality due to contamination during the mining process. Based on problem analysis there are 3 mining activities that can affect the quality of coking coal, namely: front loading preparation activities, loading and hauling activities and coal accumulation activities in ROM stock. After applicated improvement of  the mining system in each of these activities comprehensively and then pouring it into the SOP design for coking coal mining, the CSN value was increased by 66% and the ash value decreased by 43%.Keywords: Preparation Front Loading, Loading and Hauling Activities, Coal Accumalation Activities, CSN and Ash
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