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Gedung Dharma Pengabdian, Fakultas Teknik Universitas Bangka Belitung, Kampus Terpadu UBB, Balunijuk Provinsi Kepulauan Bangka Belitung
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MINERAL
Published by Universitas Bangka Belitung
ISSN : 25407708     EISSN : 2620729X     DOI : https://doi.org/10.33019/mineral.v6i2
Core Subject : Science, Social, Engineering,
Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology
The scientific journal called MINERAL is a scientific periodical publication of Mining Engineering Department , Bangka Belitung University, which is published every April and October in a year which the scope of Exploration (Geology and Geophysics), Geotechnical / Geomechanics, Minerba Processing, Minerba Management and Economics, Mining Environment, Reclamation and Post-Mining. This journal collaborates with Association of Indonesian Mining Professionals (PERHAPI) Center and Forum Komunikasi Program Studi Teknik Pertambangan se-Indonesia.
Arjuna Subject : Ilmu Bumi dan Planet (semua kategori) - Ilmu Bumi dan Planet (Lain-Lain)
Articles 14 Documents
 1   2 
Search results for , issue "Vol 9 No 1 (2024): MINERAL" : 14 Documents clear
Pengaruh Pre-roasting Terhadap Kinetika Leaching Fe dari Laterite Tipe Limonite Gyan Prameswara
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4567

Abstract

Extraction of valuable metals from laterite is intensified. The scarcity of sulfide sources containing high Ni and the use of pyrometallurgical processes with high capital costs are important reasons to initiate extraction of valuable metals from oxide minerals such as laterite and hydrometallurgical processes such as leaching. In this study, the effect of pre-roasting of limonite type laterite on Fe leaching kinetics parameters was observed. Roasting was carried out at 280 °C and 610 °C to transform the geotite phase into hematite and dehydroxylate Mg-Si associated minerals. Roasting was carried out for 4 hours in a muffle furnace. Non-roasted and roasted ore were then leached at a temperature range of 30-90 °C at a time variation of 0 to 240 minutes using sulfuric acid at a concentration of 2M, S/L ratio of 10 g/100 mL, and rotating speed of 200 rpm. Roasted ore (280 °C) showed better leaching performance than non-roasted ore while increasing the roasting temperature to 610 °C did not provide a significant increase in Fe recovery. Kinetic parameters such as activation energy (EA) and frequency factor were also reduced by using roasted ore. An EA value of 31.66 kJ/mol was obtained in the leaching process using 280 °C roasted ore. The leaching process is confirmed to be controlled by diffusion through the product layer with the following kinetic equation kt=31.59 exp (-31.66/(RT))t=1-2/3X-(1-X)^(2/3).
Optimalisasi Waktu Hambatan Excavator Untuk Mencapai Target Produksi Batubara Pit C CV Kutai Kumala Energy Henny Magdalena; Fransiska Yuniari Saksono
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4677

Abstract

The barriers on the activity causes losstime. The losstime of excavator that so high cause coal production targets not to be achieved. Therefore efforts are made to improve the losstime. The analysis of multiple linear regression multivariate is used as a problem solving approach, namely finding the maximum limit of idle time and delay time and formulating the optimal losstime. Based on observations of the idle time and delay time of two excavator units operating in the morning shift, the regression equation is obtained Y = 1832.782 – 95.134X1. The equation of optimal losstime is X2 = -0.8729X1 + 10.71. The simulation is carried out based on the average actual data, the maximum idle time limit of 6.67 hours and a delay time of 4.89 hours. For an idle time of 4.45 hours, it is expected that the delay time will not exceed 6.83 hours in order to achieve the production target. The causes of unfulfilled of production were include rain, landslides, breakdown units, slippery, operator needs and et cetera.
Optimasi Desain Geometri Lereng Material Old Dump Pada Usaha Penggalian Ulang Pit X PT. Bukit Asam Tbk Rosihan Pebrianto; Anna Amelia Louisa; Edwin Harsiga; Harry Waristian
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.5298

Abstract

In doing slope design, it is necessary to pay attention to slope geometry and soil shear strength. Determination of slope geometry design also considers the balance between height and slope and production benefits. Research was conducted to analyze slope stability through physical and mechanical properties testing, limit equilibrium, and probabilistic Monte Carlo methods. The surface area of the Overburden stripping area in the 2024 RKP design is 8,172.79 m2. The production target is 2,000,000 tons of coal with a volume of overburden material that must be stripped of 29,000,000 BCM and obtained a Stripping Ratio value of 14.5. The results of the evaluation of the overall slope of the Old Dump material with an overall slope height of 66.582 m, a slope width of 447.69 m, an overall slope of 8.32˚ and a bench width of 25 m, a bench height of 6 m with a comparison ratio of 1:3 and a single slope angle of 18.43˚. Then the redesign was carried out and obtained recommendation results of 64.799 m overall slope height, 303.33 m slope width, 13.02˚ overall slope, and 25 m bench width, bench height at elevation 131-110 of 8 m with a comparison ratio of 1:2, single slope 26.57˚ and at elevation 110-50 of 8 m with a comparison ratio of 1:1.5, single slope 33.69˚.
Perancangan Perancangan Dan Penjadwalan Penambangan Tahun 2023 Di Pit 3 PT. Mutiara Fortuna Raya 180 Kabupaten Muaro Jambi putra, brian khurohmad; Yulanda, Yudi Arista; Prabawa, Aditya Denny
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4691

Abstract

PT Mutiara Fortuna Raya's mining operations are currently guided by an annual mining design without detailed mining scheduling. However, variations in mining direction and sequence can lead to discrepancies in coal expose achievement, ultimately impacting coal production outcomes. High SR locations demand a more overburden volume and time. This research aims to evaluate various mining direction options to determine the most optimal approach. The research methodology uses a quantitative approach, comparing three mining scheduling scenarios: panel scenario, strip scenario, and block scenario. These scenarios are based on the 2023 reserve design results of 180,518 tons coal and 385,390 BCM of overburden. The outcomes of these three scenarios reveal varying stripping ratios across each period. Stripping ratio for the panel scenario: Quarter I SR 10.84, Quarter II SR 4.77, Quarter III SR 1.64, and Quarter IV SR 0.20. Stripping ratio for the strip scenario: Quarter I SR 5.11, Quarter II SR 2.40, Quarter III SR 1.67, and Quarter IV SR 0.53. Stripping ratio for the block scenario: Quarter I SR 8.93, Quarter II SR 3.10, Quarter III SR 1.74, and Quarter IV SR 0.21. Analysis of three scenarios indicates that block scenario presents the most favorable schedulling for implementation.
Perencanaan Tahapan Persiapan Dan Perhitungan Reklamasi Di Lahan Bekas Tambang Air Rikai PT Timah Tbk Kabupaten Bangka Salsabila Oldia Zahrah; Franto Franto; Mardiah Mardiah
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.5140

Abstract

The research location chosen was the Air Rikai ex-mining land, which is an alluvial ex-mining land within the IUP of PT Timah Tbk. The negative impact that arises from mining is in the form of land damage. This research aims to overcome damage and also ensure that reclamation activities can be carried out well. The method used in this research is a quantitative method. The data taken is in the form of soil samples, soil pH and water pH data, topographic data (x,y,z coordinates) and bathymetric data for the depth of the pit. The results of data processing and analysis show that the condition of the land to be reclaimed has an area of 13 Ha and is divided into 2, namely voids with a total area of 1.57 Ha and land area of 11.43 Ha. Land use is carried out by stockpiling overburden with a required volume of overburden of 35,511.54 m³. Land leveling with a volume of pushed soil of 35,280 m³. Arrangement of the edge of the pit with a volume of soil moved of 230.29 m³. Construction of drainage channels with an excavation volume of 214.59 m³. Installation of concrete buis type culverts with dimensions of 50 x 50 cm and a length of 50 cm. In the revegetation, 1,517 oil palm trees were planted, then 463 sea cypress trees were planted along the underside and LCC seeds to help loosen the soil. Treating acid mine drainage with 350 water hyacinths. The costs required for reclamation are divided into 2, namely, Direct Costs and Indirect Costs. The direct costs required are IDR 679,286,160 and the indirect costs required are IDR 213,975,140. The total costs required for reclamation of land with an area of 13 Ha are IDR 893,261,300.
Estimasi Sumberdaya Andesit dan Breksi Piroklastik Sebagai Bahan Konstruksi PT. Tepat Guna Referindo Lombok Timur Rukayah Rukayah; Aji Syailendr; Melinda Dwi Erintina
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.5425

Abstract

Estimate of andesite and pyroclastic breccia resources at PT Tepat Guna Reforindo has been carried out. Which is an area with potential for non-metallic mining materials. This research was carried out using the Civil 3D Gridding method. One of the non-metallic minerals found in East Lombok district is andesite rock and pyroclastic breccia. The research was carried out using petrological analysis methods to obtain rock types and estimate the availability of minerals and sieve analysis to obtain density values at the research location. Based on the results of petrological analysis, it shows that the sample is a type of andesite rock and also breccia. However, the presence of all samples is dominated by andesite rock samples which are abundant in 95% of the exploration area. Based on the results estimation of andesite rock resources from geological modeling and calculations using the Civil 3D Gridding method from A-B at an elevation of 100-40 meters above sea level, it was found that the measured resource of andesite rock units had a volume of 492,638.108 m3 and resource of pyroclastic breccia rock units had a volume of 738,957.162 m3, results of the analysis of the average rock density of 2.74 g/cm3, then the tonnage of the andesite unit is 1,302,781.480 tons and the pyroclastic breccia tonnage is 1,998,879.120 tons.
Analisis Metode Perhitungan Kuantitas Batubara Di Stockpile ROM PT. XYZ Edwin Harsiga; Siti Hardianti; Ardhi Lufthansyah Hidayat
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.5547

Abstract

PT XYZ had a method called the on book method to determine the amount of coal tonnage in the ROM stockpile.. This method used the initial stock from the survey calculation resut at the beginning of each month, the incoming coal to the stockpile used truck count method, and the outgoing coal from stockpile used weighbridge calculation. PT XYZ used the survey calculation results at the beginning of the next month rather than on book method result to determine the difference. The Coal tonnages based on survey result data on April 2 was 34.225,454 tons. Whereas, for the on-book calculation, the stock at March 2 was 38.409,083 tons, the coal in 2 March - 2 April was 71.154 tons, and the coal out of 2 March - 2 April was 67.994,52 tons, so the final stock obtained was 41.568,56 tons. The difference from those two methods comparison was 7.343,11 tons. This research discover the factors causing the differences between two methods i.e. incompatible vessel capacity on the truck counts tonnage calculation, disorganized stockpile patterns, declining ROM stockpile base conditions, spilled material, total station tools and weighbridges which had not been calibrated yet.
Pengaruh Pre-roasting Terhadap Kinetika Leaching Fe dari Laterite Tipe Limonite: Effect Of Pre-roasting On Fe Leaching Kinetics from Limonite-Type Laterite Prameswara, Gyan
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4567

Abstract

Extraction of valuable metals from laterite is intensified. The scarcity of sulfide sources containing high Ni and the use of pyrometallurgical processes with high capital costs are important reasons to initiate extraction of valuable metals from oxide minerals such as laterite and hydrometallurgical processes such as leaching. In this study, the effect of pre-roasting of limonite type laterite on Fe leaching kinetics parameters was observed. Roasting was carried out at 280 °C and 610 °C to transform the geotite phase into hematite and dehydroxylate Mg-Si associated minerals. Roasting was carried out for 4 hours in a muffle furnace. Non-roasted and roasted ore were then leached at a temperature range of 30-90 °C at a time variation of 0 to 240 minutes using sulfuric acid at a concentration of 2M, S/L ratio of 10 g/100 mL, and rotating speed of 200 rpm. Roasted ore (280 °C) showed better leaching performance than non-roasted ore while increasing the roasting temperature to 610 °C did not provide a significant increase in Fe recovery. Kinetic parameters such as activation energy (EA) and frequency factor were also reduced by using roasted ore. An EA value of 31.66 kJ/mol was obtained in the leaching process using 280 °C roasted ore. The leaching process is confirmed to be controlled by diffusion through the product layer with the following kinetic equation kt=31.59 exp (-31.66/(RT))t=1-2/3X-(1-X)^(2/3).
Optimalisasi Waktu Hambatan Excavator Untuk Mencapai Target Produksi Batubara Pit C CV Kutai Kumala Energy: Optimization Losstime of Excavator to Achieve Coal Production Target at Pit C CV Kutai Kumala Energy Magdalena, Henny; Saksono, Fransiska Yuniari
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4677

Abstract

The barriers on the activity causes losstime. The losstime of excavator that so high cause coal production targets not to be achieved. Therefore efforts are made to improve the losstime. The analysis of multiple linear regression multivariate is used as a problem solving approach, namely finding the maximum limit of idle time and delay time and formulating the optimal losstime. Based on observations of the idle time and delay time of two excavator units operating in the morning shift, the regression equation is obtained Y = 1832.782 – 95.134X1. The equation of optimal losstime is X2 = -0.8729X1 + 10.71. The simulation is carried out based on the average actual data, the maximum idle time limit of 6.67 hours and a delay time of 4.89 hours. For an idle time of 4.45 hours, it is expected that the delay time will not exceed 6.83 hours in order to achieve the production target. The causes of unfulfilled of production were include rain, landslides, breakdown units, slippery, operator needs and et cetera.
Perancangan Perancangan Dan Penjadwalan Penambangan Tahun 2023 Di Pit 3 PT. Mutiara Fortuna Raya 180 Kabupaten Muaro Jambi: Design And Mining Scheduling In 2023 At Pit 3 PT. Mutiara Fortuna Raya 180 Muaro Jambi District putra, brian khurohmad; Yulanda, Yudi Arista; Prabawa, Aditya Denny
MINERAL Vol 9 No 1 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v9i1.4691

Abstract

PT Mutiara Fortuna Raya's mining operations are currently guided by an annual mining design without detailed mining scheduling. However, variations in mining direction and sequence can lead to discrepancies in coal expose achievement, ultimately impacting coal production outcomes. High SR locations demand a more overburden volume and time. This research aims to evaluate various mining direction options to determine the most optimal approach. The research methodology uses a quantitative approach, comparing three mining scheduling scenarios: panel scenario, strip scenario, and block scenario. These scenarios are based on the 2023 reserve design results of 180,518 tons coal and 385,390 BCM of overburden. The outcomes of these three scenarios reveal varying stripping ratios across each period. Stripping ratio for the panel scenario: Quarter I SR 10.84, Quarter II SR 4.77, Quarter III SR 1.64, and Quarter IV SR 0.20. Stripping ratio for the strip scenario: Quarter I SR 5.11, Quarter II SR 2.40, Quarter III SR 1.67, and Quarter IV SR 0.53. Stripping ratio for the block scenario: Quarter I SR 8.93, Quarter II SR 3.10, Quarter III SR 1.74, and Quarter IV SR 0.21. Analysis of three scenarios indicates that block scenario presents the most favorable schedulling for implementation.

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