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Studi Pengaruh Bentuk dan Kemiringan Permukaan Pilar Terhadap Kekuatan dan Faktor Keamanan Pilar Rully Nurhasan Ramadani; Iswandaru Iswandaru; Ridho K. Wattimena; Made A Rai
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

Study of stability and pillar failure mechanism with a variety of methods have beencarried with empirical and analytical approach. H. Moomivand dan V.S. Vutukuri in 2008 doto research with physical model of coal cubic with ratio of 0,25 to 10 with surface of pillar ishorizontal, this research aims to investigated changes in the ratio of pillar on compressivestrength and pillar mine failure mechanism, to study the relationship do the physical modellingwith 5 variations of height of 5 cm – 40 cm each pillar geometry has 7 variatons inclinedsurface 0o-30o. Samples of the pillar of testing with direction of the axial load on the body pillaruntil failure. Other than that do to 2D numerical modelling with finite element methods withassisted of software Phase2 (Rockscience). Physical modelling result showed the value ofthe compressive strength and the strength of pillar will be increased with the increasing ratioof pillars w/h. Effect of change in the inclined surface pillar to the compressive strength andpillar of strength showed no behavioral changes in the compressive strength and the strengthof the pillars to change the angle of the surface of the pillar. Changes in strength factor andsigma 1 showed decreasing of the value when the angle of the pillar is increasing eventhough the changes in the value of the numerical modeling results are not significant.

Probabilistik Kelongsoran Lereng Tambang Terbuka Grasberg PT Freeport Indonesia Iswandaru Iswandaru; Rully Nurhasan R.; Made Astawa Rai; Ridho K. Wattimena
PROMINE Vol 7 No 1 (2019): PROMINE
Publisher : Jurusan Teknik Pertambangan, Fakultas Teknik, Universitas Bangka Belitung

The stability of a slope in mining activities is highly influenced by geology, especially thenature of rocks and geological structures. Slope stability analysis will be faced with severalproblems in the uncertainty of rock properties and rock mass. Slope stability analysis usingprobabilistic methods offers a more systematic way of treating conditions of uncertainty andprovides other alternatives to the value factor approach to security regarding information onthe probability of a slope failure.Grasberg Open Mine rock type classification based ongeotechnical parameters or Geotechnical Rock Code (GTRCK) classifies rocks based onrock type, rock mechanical properties, hydrothermal alteration type, clay content and RockQuality Designation (RQD) to 46 types of GTRCK. The GTRCK type which has a low rockmass strength value is a change in intrusive rock minerals and a low RQD value such as alot of clay material is exposed in the Northeast and Southwest of the Grasberg Open PitMine.The overall slope probabilistic modeling of the Grasberg mine uses a cross section of220o (northwest) with the effect of a 0.02g seismic factor which is the maximum criterionaccording to the probability of slope failure received with the average FK 1.13 and PK 0%.

Kestabilan Lereng Tambang Terbuka pada Tambang Emas di PT X Kecamatan Simpenan, Kabupaten Sukabumi, Provinsi Jawa Barat Krispian Fathan Hidayatullah; Iswandaru
Jurnal Riset Teknik Pertambangan Volume 1, No. 2, Desember 2021, Jurnal Riset Teknik Pertambangan (JRTP)
Publisher : UPT Publikasi Ilmiah Unisba

Abstract. Slope stability itself is an important factor in the design and operational planning process in open-pit mines. This research aims to find out the physical and mechanical properties of rocks at the research site, find out the optimal slope geometry at the research site and find out the possibility of avalanche types in the field of derailment. Methods in analyzing slope stability in research using bishob methods and bag probabili methodsaimed for alternative approaches in determining slope stability by estimating the possibility of slopes experiencing cladding (PK) as well as the value of safety factors (FK). The probability value of leniency (PK) and security factor (FK) are classified according to KEPMEN ESDM Number 1827K/30/MEM/2018. Based on the classification, a single slope that is said to be safe is FK (Static) 1.1 while FK (Dynamic) does not exist and for PK of 25-50% with low-highlandslideseverity, while for the overall slope it can be said to be safe if FK (Static) 1.3 while FK (Dynamic) 1.05 and for PK by 5-10% with medium landslide severity. Analysis of slope stability in the research area is simulated in the state of groundwater level most saturated with point 5 according to the classification of hoek and bray. The results of the study found that the most optimal single slope with a height of 5 meters with a slope of 550 with an FK value of 1.25 and PK of 3.10%. The determination of overall slope geometry is taken based on the most optimal single slope geometry by simulating with the overall height of the slope 20 m, 40 m, 60 m, 80 m, and 100 m. So that the most optimal overall slope is obtained with a height of 20 m with a value of FK (static) 1.54 FK (dynamic) 1.23 and PK 0%. Abstrak. Kestabilan lereng sendiri merupakan suatu faktor yang penting dalam proses perencanaan desain serta operasional pada tambang terbuka. Penelitian ini bertujuan untuk mengetahui sifat fisik dan mekanik batuan pada lokasi penelitian, mengetahui geometri lereng optimal pada lokasi penelitian serta mengetahui kemungkinan jenis longsoran pada bidang gelincir. Metode dalam menganalisis kestabilan lereng pada penelitian menggunakan metode bishob dan metode probabilitas yang bertujuan untuk pendekatan alternatif dalam menentukan kestabilan lereng dengan memperkirakan kemungkinan lereng mengalami kelongsoran (PK) serta nilai faktor keamanan (FK). Nilai probabilitas kelongsoran (PK) dan faktor keamanan (FK) salah satunya diklasifikasikan menurut KEPMEN ESDM Nomor 1827K/30/MEM/2018. Berdasarkan klasifikasi tersebut lereng tunggal yang dikatakan aman yaitu FK (Statis) 1,1 sementara FK(Dinamis) tidak ada dan untuk PK sebesar 25-50% dengan keparahan longsor low-high, sementara untuk lereng keseluruhan dapat dikatakan aman jika FK (Statis) 1,3 sementara FK(Dinamis) 1,05 dan untuk PK sebesar 5-10% dengan keparahan longsor medium.Analisis terhadap kestabilan lereng pada daerah penelitian disimulasikan dalam keadaan muka air tanah paling jenuh dengan point 5 menurut klasifikasi hoek and bray. Hasil penelitian didapatkan bahwa lereng tunggal yang paling optimal dengan ketinggian 5 meter dengan slope 550 dengan nilai FK 1,25 dan PK 3,10%. Penentuan geometri lereng keseluruhan diambil berdasarkan geometri lereng tunggal yang paling optimal dengan mensimulasikan dengan ketinggian keseluruhan lereng 20 m, 40 m, 60 m, 80 m, dan 100 m. Sehingga didapatkan lereng keseluruhan yang paling optimal adalah dengan ketinggian 20 m dengan nilai FK (statis) 1,54 FK (dinamis) 1,23 dan PK 0%.

Analisis Kestabilan Lereng Andesit Menggunakan Metode FEM pada PT. X Ruslan Loilatu; Iswandaru
Jurnal Riset Teknik Pertambangan Volume 2, No. 1, Juli 2022, Jurnal Riset Teknik Pertambangan (JRTP)
Publisher : UPT Publikasi Ilmiah Unisba

Abstract. Geotechnical study data collection includes geotechnical mapping, observations of landslide models that can occur, and sampling for testing physical and mechanical properties. The geotechnical study carried out is by analyzing slides on production slopes, the analytical method used in the analysis of landslides on slopes is the kinematic method, analysis with this method uses rock mass parameters, discontinuity planes, and production slope geometry as input. The overall slope stability analysis using the Finite Element Method (FEM) shows the overall slope is in a stable condition seen from the value of the Safety Factor (FK) which is 1.26. For single slope stability analysis, the slope is modeled with three variations of slope and three variations of height to determine the minimum limit of optimal slope geometry. For slopes with optimal conditions compared to the other two variations of angles, namely slopes with a slope of 50° and a maximum height of 10 m with an SRF of > 1.25 which is used as an optimal slope recommendation, the slope with that slope if modeled with several variations in height, namely 5 m has an SRF of 2.02, a height of 10 m has an SRF of 1.48, and a height of 15 m has an SRF of 1.28, which shows the three variations in height using a slope of 50° have an FK value > 1.25, whereas if the height is made to exceed the limit a height of 15 m, the slope has the potential for landslides. Abstrak. Pengumpulan data studi geoteknik meliputi pemetaan geoteknik, pengamatan model longsoran yang dapat terjadi, dan melakukan sampling untuk pengujian sifat fisik dan sifat mekanik. Kajian geoteknik yang dilakukan adalah dengan menganalisis kelongsoran pada lereng produksi, metode analisis yang digunakan dalam analisis longsoran pada lereng adalah metode kinematik, analisis dengan metode ini menggunakan input parameter massa batuan, bidang diskontinuitas, dan geometri lereng produksi. Analisis kestabilan lereng keseluruhan menggunakan Finite Element Method (FEM) menunjukan lereng keseluruhan dalam kondisi stabil dilihat dari nilai Faktor Keamanan (FK) yang didapatkan sebesar 1,26. Untuk analisis kestabilan lereng tunggal lereng dimodelkan dengan tiga variasi kemiringan dan tiga variasi ketinggian untuk mengetahui batas minimum geometri lereng yang optimal. Untuk lereng dengan kondisi yang optimal dibandingkan dua variasi sudut yang lain adalah lereng dengan kemiringan 50° dan tinggi maksimum 10 m dengan SRF sebesar >1,25 yang dijadikan sebagai rekomendasi lereng yang optimal, lereng dengan kemiringan tersebut jika dimodelkan dengan beberapa variasi ketinggian yaitu 5 m memiliki SRF sebesar 2,02 , ketinggian 10 m memiliki SRF 1,48, dan ketinggian 15 m memiliki SRF sebesar 1,28, yang menunjukan ketiga variasi ketinggian dengan menggunakan kemiringan 50° memiliki nilai FK >1,25, sedangkan jika ketinggian dibuat melebihi batas ketinggian 15 m maka lereng berpotensi longsor.

Kajian Alat Muat dan Alat Angkut untuk Optimalisasi Produksi Batu Andesit di PT Nurmuda Cahaya Kecamatan Batujajar Timur, Kabupaten Bandung, Provinsi Jawa Barat Rahmat Widayat; Zaenal; Iswandaru
Bandung Conference Series: Mining Engineering Vol. 2 No. 1 (2022): Bandung Conference Series: Mining Engineering
Publisher : UNISBA Press

Abstract. The condition of the large material has an effect on the circulation time of the digging tool. Based on the results of proven calculations that fragmentation of chunks caused the efficiency of the digging-fit tool is very low, namely 55.4% with actual production of 7,329 tons/month and resulted in a domino effect on the efficiency of the hauler of 55.3% and production of only 6,676 tons/month. So that the percentage of mechanical equipment production volume to blasting volume is 52.35%. Based on the results of the study of mechanical equipment production through the condition of the material, the problem solving will be done is by procurement of tools for fragmentation of chunks of rock. The recommended tool is the PC200-8M0 excavator breaker that will assist the process of material mining activities. After going through the calculation stage, the productivity capability of PC 200-8M0 excavator breaker reaches 1/4 of the theoretical volume of dig-fit equipment of 17 m3/h capable of producing as much as 225.2 tons /day of rock so that 5,856 tons can be solved during the month through only 1 excavator breaker tool. Based on the production calculation, 76.35% of the rock can be resolved by 1 excavator breaker which means that this tool is able to calculate the performance of the dig-fit tool to 70,56% so that the monthly production of PT Nurmuda Cahaya rocks can be met. Production engineering that has been calculated where the ability of excavator breaker equipment will produce rocks of 5,856 tons/month so that the efficiency of the dig-fit equipment will increase to 70.56% with productivity results of 84.3 tons/hour and transportation efficiency to 70.54% with a productivity value of 77.21 tons/hour. Abstrak. Kondisi material yang berukuran besar tersebut berpengaruh terhadap waktu edar alat gali-muat. Berdasarkan hasil perhitungan terbukti bahwa fragmentasi bongkah menyebabkan efisiensi alat gali-muat sangat rendah yaitu 55,4% dengan produksi aktual 7.329 ton/bulan serta mengakibatkan efek domino pada efisiensi alat angkut yaitu sebesar 55,3% dan produksi hanya sebesar 6.676 ton/bulan. Sehingga persentase volume produksi alat mekanis terhadap volume peledakan sebesar 52,35%. Berdasarkan hasil kajian produksi alat mekanis melalui kondisi material tersebut maka pemecahan masalah yang akan dilakukan ialah dengan pengadaan alat untuk pemecah/penghancur fragmentasi bongkah batuan. Alat yang direkomendasikan yaitu excavator breaker PC200-8M0 yang akan membantu proses kegiatan penambangan material. Setelah melalui tahap perhitungan, kemampuan produktivitas excavator breaker PC 200-8M0 mencapai ¼ dari volume teoritis alat gali-muat yaitu sebesar 17 m3/jam yang mampu menghasilkan produksi sebanyak 225,2 ton/hari batuan sehingga 5.856 ton dapat terpecahkan selama bulan tersebut hanya melalui 1 alat excavator breaker. Berdasarkan hasil perhitungan produksi tersebut maka 76,35% batuan dapat teratasi oleh 1 breaker excavator yang artinya alat ini mampu mengefesiensikan kinerja alat gali-muat menjadi 70,56% sehingga produksi bulanan batuan PT Nurmuda Cahaya dapat terpenuhi. Rekayasa produksi yang sudah diperhitungan dimana kemampuan alat excavator breaker akan memproduksi batuan sebesar 5.856 ton/bulan sehingga efisiensi alat gali-muat akan meningkat menjadi 70,56% dengan hasil produktivitas 84,3 ton/jam serta efisiensi alat angkut menjadi 70,54% dengan nilai produktivitas 77,21 ton/jam.

Pengujian Daya Dukung Perkerasan Jalan Tambang dengan Dynamic Cone Penetrometer (DCP) di PT Mitra Multi Sejahtera Muhammad Iqbal Fadillah; Iswandaru; Zaenal
Bandung Conference Series: Mining Engineering Vol. 2 No. 1 (2022): Bandung Conference Series: Mining Engineering
Publisher : UNISBA Press

Abstract. The value of the California bearing ratio is used to evaluate the need for pavement and as an effort to maintain the road. Based on SNI 03-1744-1089, it explains that CBR testing can be done in the laboratory, while conducting the test takes a long time and is relatively expensive, so there is a way to get the CBR value directly in the field using a dynamic cone penetrometer. Dynamic cone penetrometer is a tool that can be used in determining the CBR value which has been described in ASTM D6951/D6951M – 09 regarding "Standard Test Method For Use Of The Dynamic Cone Penetrometer in Shallow Pavement Application". The value of the largest california bearing ratio of 22.62% is considered less on the standard road composed of rocks because the CBR value of the road consisting of rocks will get a CBR value of up to 60%. The largest soil bearing capacity value of 7.57 (x1000 psf) indicates that the condition of the road foundation in the study area is insufficient to withstand a load of 16 (x1000 psf) from the truck and its cargo so that the road surface decreases and makes the road uneven. The pavement thickness index in the form of the foundation layer and the required pavement layer in segment 1 is 35 cm and 6.4 cm, respectively, with an ITP value of 4.35, then segment 2 of 50 cm and 9.3 cm with an ITP value of 6.21. The value of ITP itself is obtained from the results of plotting by nomogram no.7, the reason for choosing nomogram no.7 is because the IPo and IPt values are sufficient to meet the requirements for using the nomogram. Abstrak. Nilai california bearing ratio digunakan untuk mengevaluasi kebutuhan perkerasan jalan dan sebagai upaya pemeliharaan jalan. Berdasarkan SNI 03-1744- 1089 menjelaskan bahwa pengujian CBR dapat dilakukan di laboratorium sedangkan untuk melakukan pengujian membutukan waktu yang lama dan biaya yang relatif mahal, sehingga terdapat cara untuk mendapatkan nilai CBR langsung di lapangan dengan menggunakan alat dynamic cone penetrometer. Dynamic cone penetrometer merupakan suatu alat yang dapat digunakan dalam penentuan nilai CBR yang telah dijelaskan pada ASTM D6951/D6951M – 09 mengenai “Standard Test Method For Use Of The Dynamic Cone Penetrometer in Shallow Pavement Application”. Nilai dari california bearing ratio terbesar senilai 22,62% dinilai kurang pada standar jalan yang berkomposisi batuan karena untuk nilai CBR dari jalan yang terdiri dari batuan akan mendapatkan nilai CBR yang mencapai 60%. Nilai daya dukung tanah terbesar senilai 7,57 (x1000 psf) menandakan kondisi pondasi jalan di daerah penelitian terbilang kurang cukup untuk menahan beban sebesar 16 (x1000 psf) dari truck dan muatannya sehingga terjadinya penurunan permukaan jalan dan membuat jalan tidak rata. Indeks tebal perkerasan berupa lapisan pondasi dan lapisan perkerasan yang dibutuhkan pada segmen 1 secara berturut-turut sebesar 35 cm dan 6,4 cm dengan nilai ITP 4,35 lalu segmen 2 sebesar 50 cm dan 9,3 cm dengan nilai ITP 6,21. Nilai dari ITP sendiri didapatkan dari hasil plotting oleh nomogram no.7, alasan memilih nomogram no.7 karena nilai IPo dan IPt cukup untuk memenuhi persyaratan penggunaan nomogram tersebut.

Penentuan Sisa Umur Pakai Struktur Conveyor H pada Tambang Batubara PT GHI di Kabupaten Tapin, Provinsi Kalimantan Selatan Soultan Taufiq; Elfida Moralista; Iswandaru
Bandung Conference Series: Mining Engineering Vol. 2 No. 1 (2022): Bandung Conference Series: Mining Engineering
Publisher : UNISBA Press

Abstract. Conveyor structure is a tool that is applied to the mining industry as a tool that supports the process of moving excavated materials such as coal. The structure of the conveyor is made of steel which is subject to corrosion. The disadvantage of corrosion is that it results in a reduction in the thickness of the conveyor structure. Therefore, it is necessary to control and monitor corrosion on the conveyor structure to be observed, so that corrosion can be controlled. The purpose of this research is to determine the type of corrosion, corrosion rate, remaining service life, and control methods. The methodology used in this study is measuring the thickness reduction of the conveyor structure. This research was conducted on a conveyor structure of 90 meters above ground level. Measurement of the thickness of the conveyor structure using the Ultrasonic Thickness Gauge TT 130 at 25 observation points. The environmental conditions in the research area are the air temperature in the range of 26 oC-32oC, while the rainfall with an average range of 197.58 mm-165.71 cm. In controlling this corrosion using a coating method with Seaguard 5000 primer coating, Sherglass FF intermediate coating, and aliphatic acrylic modified polyurethane top coating. The corrosion rate of the conveyor structure ranges from 0.18-0.3 mm/year. The remaining service life of the conveyor structure ranges from 7,16-9,65 years. The service life of the conveyor structure is 7 years, while the design life is 15 years. 25 observation points, 28.00% below the design life. Abstrak. Conveyor adalah alat yang diaplikasikan pada industri pertambangan sebagai alat yang menunjang dalam proses pemindahan material bahan galian contohnya batubara. Struktur conveyor terbuat dari baja yang dapat mengalami korosi. Kerugian terjadinya korosi yaitu mengakibatkan pengurangan ketebalan struktur conveyor. Oleh karena itu, diperlukannya pengendalian serta monitoring korosi pada struktur conveyor yang akan diamati, sehingga korosi dapat dikendalikan. Tujuan dilakukannya penelitian ini adalah untuk mengetahui jenis korosi, laju korosi, sisa umur pakai, dan metoda pengendaliannya. Metodologi yang digunakan dalam penelitian ini yaitu pengukuran pengurangan ketebalan struktur conveyor. Penelitian ini dilakukan pada struktur conveyor sepanjang 90 meter yang berada di atas permukaan tanah. Pengukuran ketebalan struktur conveyor menggunakan alat Ultrasonic Thickness Gauge TT 130 pada 25 test point. Kondisi lingkungan di daerah penelitian yaitu temperatur udara kisaran 26 oC-32oC, sedangkan curah hujan dengan rata-rata kisaran 197,58 mm-165,71 cm. Jenis korosi yang terjadi pada struktur conveyor adalah korosi merata. Dalam pengendalian korosi ini menggunakan metoda coating dengan primer coating Seaguard 5000, intermediate coating Sherglass FF, dan top coating aliphatic acrylic modified polyurethane. Laju korosi struktur conveyor berkisar antara 0,18-0,3 mm/tahun. Sedangkan sisa umur pakai struktur conveyor berkisar antara 7,16-9,65 tahun. Umur pakai struktur conveyor yaitu 7 tahun, sedangkan umur desainnya 15 tahun. Pada 25 test point, didapatkan persentase sebesar 28,00% yang diprediksikan di bawah umur desainnya.

Rancangan Teknis Penambangan Emas pada PT DEF di Kecamatan Simpenan, Kabupaten Sukabumi, Provinsi Jawa Barat Bagea Bagja Gumelar Gumelar; Iswandaru; Zaenal
Bandung Conference Series: Mining Engineering Vol. 2 No. 1 (2022): Bandung Conference Series: Mining Engineering
Publisher : UNISBA Press

Abstract. PT DEF is a mining industry company engaged in gold ore mining which has a mining area in Simpenan District, Sukabumi Regency, West Java Province. Observations were made on the results of exploration drilling of 73 drill points in the form of recapitulation of drilling data which was used as a reference for making geological models and resource estimates. Based on the results of the grade assessment using the ordinary kriging method, the inferred resource was 166,482.38 tons with an average grade of 0.46 ppm, the indicated resource was 2,434,150.06 tons with an average grade of 0.58 ppm and the measured resource was 5,264,703.55 tons with an average grade of 0.85 ppm, so that the total resources obtained are 7,865,335.99 tons with an average grade of 0.76 ppm. Determination of areas that have the potential for mining is done based on the largest NPV value from the optimization pit results. Mining is carried out with an open-pit mining system, the mining method used is open pit. The design of the mine opening is made with a geometry of 6 m high, 5 m wide, and a slope of 52°. While the design of the road geometry used is a straight road width of 8.715 m, a bend road width of 14.84 m, a bend radius of 14.38 m, a superelevation of 40mm/m. Based on the results of the mining technical design, the mined reserves of gold ore were 7,270,393.62 tons with an average Au grade of 0.49 ppm. There are non-ore materials in the form of waste amounting to 9,190,104.22 Tons. The minimum gold ore production target is planned at 100,000 BCM/year. Abstrak. PT DEF merupakan perusahaan tambang yang bergerak pada komoditas bijih emas yang memiliki area pertambangan di Kecamatan Simpenan, Kabupaten Sukabumi, Provinsi Jawa Barat. Kegiatan Pengamatan dilakukan pada hasil eksplorasi pengeboran sejumlah 73 titik bor berupa rekapitulasi data pengeboran yang digunakan sebagai acuan pembuatan model geologi dan estimasi sumberdaya. Berdasarkan hasil penaksiran kadar menggunakan metode ordinary kriging, diperoleh sumberdaya tereka sebesar 166.482,38 ton dengan kadar rata-rata 0,46 ppm, sumberdaya terunjuk sebesar 2.434.150,06 ton dengan kadar rata-rata sebesar 0,58 ppm dan sumberdaya terukur sebesar 5.264.703,55 ton dengan kadar rata-rata sebesar 0,85 ppm, sehingga didapatkan total sumberdaya sebesar 7.865.335,99 Ton dengan kadar rata-rata sebesar 0,76 ppm. Penentuan area yang berpotensi untuk dilakukan penambangan dilakukan berdasarkan nilai NPV terbesar dari hasil pit optimasi. Penambangan dilakukan dengan sistem tambang terbuka, metode penambangan yang digunakan yaitu open pit. Rancangan bukaan tambang dibuat dengan geometri tinggi jenjang 6 m, lebar 5m, dan kemiringan 52°. Sedangkan rancangan geometri jalan yang digunakan yaitu lebar jalan lurus 8,715 m, lebar jalan tikungan 14,84 m, jari-jari tikungan sebesar 14,38 m, superelevasi 40mm/m. Berdasarkan hasil rancangan teknis penambangan, diperoleh cadangan tertambang bijih emas sebesar 7.270.393,62 Ton dengan kadar rata-rata Au 0,49 ppm. Terdapat material bukan bijih berupa waste sebesar 9.190.104,22 Ton. Target produksi minimal bijih emas direncanakan sebesar 100.000 BCM/tahun.

Rencana Kegiatan Teknis dan Ekonomi Reklamasi Lahan Bekas Tambang Andesit pada PT Gunung Lagadar Abadi di Leuwidulang, Desa Lagadar, Kecamatan Margaasih, Kabupaten Bandung, Provinsi Jawa Barat Dino Amirdin Talaohu; Zaenal; Iswandaru
Bandung Conference Series: Mining Engineering Vol. 2 No. 1 (2022): Bandung Conference Series: Mining Engineering
Publisher : UNISBA Press

Abstract. PT XYZ is a private mining company engaged in Quarry Andesite mining located in Leuwidulang Village, Lagadar Village, Margaasih District. Bandung Regency. West Java Province. With a total area of ± 5.37 Ha. One part of the mining industry is reclamation activities. where reclamation itself is a very mandatory thing to do. because the former mining activities can change the landscape and land use of an area. Reclamation is an activity that aims to improve or organize land that has been disturbed due to mining activities so that it can function and be useful according to its designation. The purpose of this research is to know the technical plan for land management, revegetation and care and maintenance in an area of former andesite mining activities where reclamation activities will be carried out. Another objective of this activity is to find out the total cost required for the planned reclamation activity in terms of its economics. The plan for the technical scheme for structuring the land to be reclaimed is carried out from 2022-2026 with the reclamation area in accordance with the area being mined. The total area to be reclaimed is 4.8 Ha. At the land use stage, mechanical equipment will be used in the form of the Kobelco SK200 Excavator, Hino 500 Dump Truck – FG235 TI. and Komatsu D85PX-18 Bulldozer. At the revegetation stage, the plants used were. among others, the main plants in the form of Acacia (Acacia), insert plants in the form of guava trees (Syzygium Aqueum) and cover crops in the form of legumes (Mucuna bracteata). This reclamation technical plan will be continued until the stage of care and maintenance of revegetation plants so that plant growth can be optimal and the success of reclamation is 100%. The total budget for this reclamation plan is Rp. 389.976.707,-. Abstrak. PT XYZ merupakan perusahaan tambang swasta yang bergerak pada bidang pertambangan Quarry andesit yang berlokasi di Kampung Leuwidulang, Desa Lagadar, Kecamatan Margaasih, Kabupaten Bandung, Provinsi Jawa Barat. Luas wilayah IUP OP keseluruhan ± 5,37 Ha. Salah satu bagian dari industri pertambangan adalah kegiatan reklamasi, dimana reklamasi sendiri adalah hal yang bersifat sangat wajib dilakukan, karena lahan bekas kegiatan penambangan dapat merubah bentang alam maupun tataguna lahan suatu wilayah. Reklamasi merupakan kegiatan yang bertujuan untuk memperbaiki atau menata lahan yang sudah terganggu akibat adanya kegiatan penambangan agar dapat berfungsi dan berguna sesuai peruntukannya. Tujuan dari penelitian ini yaitu mengetahui rencana teknis penataan lahan, revegetasi serta perawatan dan pemeliharaan pada suatu area bekas kegiatan penambangan batu andesit yang akan dilakukan kegiatan reklamasi. Tujuan lain dari kegiatan ini, yaitu untuk mengetahui total biaya yang dibutuhkan untuk rencana kegiatan reklamasi ditinjau dari sisi keekonomisannya. Rencana skema teknis penataan lahan yang akan direklamasi dilakukan dari tahun 2022 sampai 2026 dengan luas area reklamasi sesuai dengan luas area yang dilakukan penambangan. Luas total yang akan direklamasi 4,8 Ha. Pada tahapan penatagunaan lahan akan digunakan peralatan mekanis berupa Excavator Kobelco SK200, Dump Truck Hino 500 – FG235 TI, dan Bulldozer Komatsu D85PX-18. Pada tahapan revegetasi tanaman yang digunakan yaitu tanaman pokok berupa tanaman akasia (Acacia), tanaman sisipan berupa pohon jambu (Syzygium Aqueum) dan tanaman penutup berupa tanaman kacang-kacangan (Mucuna Bracteata). Rencana teknis reklamasi ini akan dilanjutkan hingga tahapan perawatan dan pemeliharaan tanaman revegetasi agar pertumbuhan tanaman dapat optimal dan tercapainya keberhasilan reklamasi sebesar 100%. Adapun anggaran total biaya rencana reklamasi ini dibutuhkan sebesar Rp 389.976.707,-.

Remaining Service Life Struktur Conveyor D pada Tambang Batubara PT XYZ di Kabupaten Kotabaru, Provinsi Kalimantan Selatan Dwiki Zulkifly Ardiansa; Elfida Moralista; Iswandaru
Bandung Conference Series: Mining Engineering Vol. 2 No. 2 (2022): Bandung Conference Series: Mining Engineering
Publisher : UNISBA Press

Abstract. Activity moving products requires the help of mechanical devices that are able to deliver materials efficiently and condicively, beside there are mechanical devices called Conveyor. Conveyors made from a carbon steel with the prone condition oxidation due to direct contact with the surrounding environment. As a result, the metal composition based conveyor structure will be experience a process a loss material composition called Corrosion. The methodoly research in that case using the method reduction thickness of the conveyor structure with the divice Ultrasonic Thickness Gauge TT 130. Environmental conditions in the conveyor structure are have an average highest rainfall in 2020 is 292,08mm/year, average relative highest humidity in 2021 is 86,75%, and average highest air temperature in 2020 is 27.53°C, the research was conducted on 90m long Conveyor structure which have divided into a 3 segments with 25 test points. The goal of research was find out the type of Corrosion, Corrosion Control, Remaining Service Life structure and the Corrosion rate of the conveyor stucture. Abstrak. Kegiatan pemindahan material–material hasil tambang memerlukan bantuan alat mekanis yang mampu mengantarkan material secara efisien dan kondusif, diantara alat mekanis tersebut adalah Conveyor. Conveyor berbahan baja karbon yang rawan mengalami oksidasi akibat bersentuhan langsung dengan lingkungan sekitar. Akibatnya Struktur Conveyor yang berbahan dasar logam akan mengalami proses kerusakan yang dinamakan korosi. Metedologi penelitian yang gunakan ialah metoda pengurangan ketebalan struktur Conveyor dengan menggunakan alat Ultrasonic Thickness Gauge TT 130. Kondisi lingkungan daerah Struktur Conveyor memiliki jumlah curah hujan rata–rata tertinggi tahun 2020 sebesar 292,08 mm/ tahun, kelembapan relatif rata–rata tertinggi tahun 2021 sebesar 86,75%, dan temperatur udara rata–rata tertinggi tahun 2020 sebesar 27,53°C. Penelitian dilakukan terhadap Struktur Conveyor D sepanjang 90m yang terbagi atas 3 segmen dengan 25 Test point. Penelitian bertujuan untuk mencari tahu jenis korosi, pengendalian korosi, Sisa Umur pakai Struktur Conveyor dan laju korosi.

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