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MINERAL

mineral
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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 172 Documents

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EVALUASI HASIL PENCUCIAN RAW MATERIAL KAOLIN TERHADAP KEBUTUHAN PRODUKSI UNIT PENGOLAHAN PT ANEKA KAOLINE UTAMA BELITUNG Mukram Belto Pratama; Irvani Irvani; Mardiah Mardiah
MINERAL Vol 6 No 1 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Aneka Kaoline Utama produces kaoline powder through two processes which are washing are washing unit and processing unit. Washing unit does the separation between tailing and kaoline with the extract as the result. The extract contains water and kaoline, then the water reduction will be processed in processing unit. Based on the information, writer evaluates the extract production in washing unit for fulfilling the needs of processing unit in PT Aneka Kaoline Utama using evaluation method and action research method. The steps are sampling raw material (feed), calculating the sediment pond’s dimention and the volume of full pond, sampling tailing in washing unit’s tools, observing the production’s process, and evaluating the needs off kaoline extract. The result of this research shows that raw material in washing unit were 3,847.4 ton in April, 3,606.2 ton in May, 2,594.9 ton June, and 3,890 in July which showed the amound of extract did not reach the target in processing unit. 69.2% of loose material and 21% loosing kaolin in average caused the recovery value in washing unit just reached 30.8%. Because of loose kaoline’s presence in washing unit, writer suggests the increasing of raw material and working hour as big as 27,056.3 ton per hour with 30.8% washing unit’s recovery so the company can produce 8.34 ton kaoline per hour and 4,000 ton kaoline per month.

Kajian Sistem Penyaliran Tambang Bawah Tanah Pada PT Allied Indo Coal Jaya Sawahlunto Sumatera Barat Ferdinand De Lessep Samosir; Franto Franto; Delita Ega Andini
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Allied Inco Coal Jaya (PT. AICJ) is a company that work in coal mining industry. This research is done at underground mining located at main shaft tunnel at +347 metres above mean sea level (MASL) with 334,04 m in length with room and pillar method as its mining method. This research is using quantitative method. From the calculation obtained, the total of incoming water into the mining production area is 6.13 m3/hour. For the actual incoming from well is as much as 13.32 m3/hour with the total head is as big as 29.56 m, as the time needed to discharge is 6.45 hour. Making the dewatering layout design for the incoming water at elevation of +347.32 MASL to main sump at +318 MASL with total length of 201.6 m, while the water discharged at continuous pumping at elevation +306 MASL moving toward +347.43 MASL with total distance 341.32 m. with the addition to incoming water there is an increase in the pumping working hours so it is concluded that there is difference between the planned cost and actual cost of Rp. 832,269.96.

Evaluasi Kinerja Limestone Crushing Plant Terhadap Target Produksi 108.000 Ton/Bulan Pada PT Indocement Tunggal Prakarsa Tbk Unit Palimanan-Cirebon Novi Herlinda; Delita Ega Andini; Haslen Oktarianty
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

This research was conducted to optimize limestone production within a maximum of 30 days. The method used in this research is the frequency distribution statistical method for increasing the time of resistance, The data required are unit resistance hours at the Crushing plant. Based on research and calculations in the field, it is known that the work efficiency of the limestone crushing plant 09 unit is low, 62.87% with a total production only 73.846 tons/month. After many refinement efforts, work efficiency of the limestone crushing plant 09 unit increased 17.31% to 80, 19%, to increase the production target, refinement efforts were made to increase effective working hours by minimizing time constraints, and working time management accordingly production targets were achieved, therefore target production increased from 2,275 tons / shift to 4,173 tons / shift and the final production of crushing plant 09 increased to 125,190 tons / month

Analisis Ekonomis Sewa atau Beli Alat Excavator pada Kegiatan Produksi Bijih Timah PT Prima Timah Utama, Desa Cit, Kabupaten Bangka Randa Wirana; Irvani Irvani; Mardiah Mardiah
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Fulfilling the annual production target of PT Prima Timah Utama based on the 2019 Work Plan and Budget of 1,100,000 m3 requires the procurement of adequate mining equipment both in terms of quantity and production capacity, especially excavators. The equipment procurement plan is estimated by calculating the need for tools using a sample of 30 distribution time data, 9-time constraints data, and some supporting calculation data that results in tool requirements. The cost of ownership of the equipment to be compared with the rental cost is obtained from the purchase price, interest, residual value and economic life of the equipment, the cost comparison is then analyzed using the Net Present Value method. The calculation results show that PT Prima Timah Utama must add 2 units of CAT 320D2 excavator for overburden stripping and wash with an estimated equipment cost of Rp. 2,224,076,433.6 for 2 units of new equipment and Rp. 2,541,131,520 for 2 units of rental equipment where the difference between the rental and purchase equipment is Rp. 317,055,086.4 for one year of work. The result of the analysis with the evaluation of NPV investment has a value of Rp. 32,313,773,567.7 or >0 which states that the investment is declared feasible.

Evaluasi Geometri Jalan Tambang Di PT Vitrama Properti Desa Air Mesu Kabupaten Bangka Tengah Selvira Oktaviani; Janiar Pitulima; Haslen Oktarianty
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Vitrama Properti is a company engaged in mining sector that utilizes natural resources of granite. The condition of mine road at PT Vitrama Properti is not good, causing the lack of transportation productivity in the transportation process. This study aims to evaluate the geometry of the mine road. The method is terrestrial method. Data that obtained are data on straight road width, road width at bends, height differences and bend radius to evaluated with AASHTO. The smallest of road width is 4.67 m, the road width on the smallest bend is 5.8 m, the smallest height difference value is 0.9 m and the smallest radius of bend is 7.695 m. The evaluation results are the width of the haul road on a straight single lane minimum is 6.6 m, the width of the haul road on a straight two-lane minimum is 11.55 m, the width of haul road in two lines minimum bend is 16.485 m, the maximum slope of road is 10%, the superelevation is 4%, and the cross slope is 33 cm.

Analisis Pengaruh Getaran Peledakan Terhadap Kestabilan Lereng Lowwall Pada Pit 1 Tambang Batubara PT Atha Marth Naha Kramo (AMNK) Jobsite Langap, Kabupaten Malinau Propinsi Kalimantan Utara Muhamad Supardi; Supandi Supandi; R. Andy Erwin Wijaya
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT. Atha Marth Naha Kramo is a coal mining company located in Langap Village, South Malinau District, Malinau Regency, North Kalimantan, the purpose of this study was to determine the effect of blasting vibrations on lowwall slopes, to determine the probability of avalanches affected by blasting vibrations. In the study the analysis method used the Monte Carlo probability method and the method used to calculate vibrations with the regression approach and the actual condition of the slope was divided into three sections. Obtained regression equation for predicted value at slope point PPA = 4.0512 (SD)-1.238, for amax value (horizontal acceleration) at the slope point using equation amax = 0.6339 (PPA) - 0.0031, this equation is close to the recommendation of Marcusson with amax of 1/3 and 1/2 of the value (PPA). From the results of the analysis of the effect of vibration on the stability of the slope in section A-A safe conditions, section B-B unsafe conditions, section C-C unsafe conditions. So, in the study recommended a safe slope geometry. For all sections with an overall height between 32 - 51meter and overall slope 33°-39°, height 10meter and width of 5 meters, and vibration safe limit in section A-A is 0.275 g, section B-B 0.152g, section C-C 0.188g.

Kajian Perolehan Hasil Bijih Timah Berdasarkan Ukuran Butir Terhadap Variabel Magnetic Separator Skala Laboratorium Muhammad Rizki Pratama; Janiar Pitulima; E.P.S.B Taman Tono
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Industrial-scale Magnetic Separator is used to process tin ore by separating magnetic and nonmagnetic minerals using a belt conveyor speed and splitter opening only one variation. Based on this, this research is intended to obtain a more varied and optimal combination of variable settings in the recovery of tin ore yields. The method used is quantitative data analysis method by obtaining nonmagnetic minerals using a combination of splitter openings and belt conveyor speed based on grain size, calculating the content of tin ore in non-magnetic minerals using the Grain Counting Analysis method and calculating the composition of tin ore recovery. The research was conducted based on grain sizes of 60 mesh, 80 mesh, and 120 mesh using a combination of splitter opening sizes of 0.2 cm, 0.4 cm, and 0.6 cm and using a belt conveyor speed of 27.12 cm/s, 28.15 cm/s, and 28.40 cm/s. The sample used for each grain size is 9,000 grams with repetition for each combination of variables, namely 30 times. The results of this study obtained the highest yield of tin ore at grain size of 80 mesh as much as 1,753.7 grams in 8,920.3 grams of non-magnetic minerals with tin ore grades of 19.66% using a combination of speed 27.12 cm/s and splitter opening 0.2 cm. Based on the results of the study, the tin ore contained in the non-magnetic material processed by the Magnetic Separator, the grain size of 80 mesh is higher than that contained in the grain size of 60 mesh, while the grain size is finer than 80 mesh, the lower the recovery of tin ore contained in the non-magnetic material. Meanwhile, the larger the splitter opening and the speed of the conveyor belt, the higher the nonmagnetic minerals obtained.

Analisis Kelayakan Ekonomi pada Rencana Penggantian Alat Mekanis Penambangan Batubara Di PT XYZ, Kabupaten Tanah Bumbu, Provinsi Kalimantan Selatan Gading Abi Pangestu; Riswan Riswan; Karina Shella Putri
MINERAL Vol 6 No 2 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT XYZ plans to replace the production unit of the Kobelco SK200 excavator because it is unable to achieve the production target with a Mechanical Availability (MA) value of 55%. There are 7 scenarios in considering the replacement of the equipment. The analysis is carried out by considering the unit's capability and value in Net Present Value (NPV), Internal Rate of Return (IRR), and payback period in each scenario. The scenario for the improvement of Kobelco SK200 which increases the MA value to 75% is still unable to achieve the production target. Economic analysis shows that the highest NPV is in scenario 4 of Rp. 22,240,168,298, while the highest IRR is in scenario 3 of 79.93%. If PT XYZ wants a faster payback duration, scenario 3 by selling old equipment and renting used equipment with an MA value according to the target is the best choice. In addition, in terms of capital requirements, scenario 3 is the option with the lowest initial capital, where the amount of capital is a very important factor and often limits the ability of entrepreneurs and mining companies.

Evaluasi Teknis dan Biaya pada Sistem Penyaliran Tambang di Pit 4 Edward PT Caritas Energi Indonesia Sarolangun Jambi Nur Annisa; Franto Franto; Delita Ega Andini
MINERAL Vol 7 No 1 (2022): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v7i1.3330

This research was conducted to redesign the dimensions of the temporary sump to accommodate the total volume of incoming water so as to minimize the occurrence of puddles around the mining area. The method used is a quantitative method by analyzing daily rainfall data for 10 years (2011-2020) using the Gumbell distribution. Actual data in the form of field rainfall intensity, sump water level rise, dimensions and actual discharge of the channel as well as the length and diameter of the pipe. Based on the 5-year return period, the total incoming discharge is 27,043.160 m3/day and based on the maximum rainfall of 30,693.351 m3/day after pumping 607.71 m3/hour for 7 hours, resulting in a residual discharge of 22,789.190 m3/day for 37.5 hours (PUH 5 years) and 26,439.387 m3/day for 43.5 hours (maximum CH). The actual dimensions of all four of Edward's Pit 4 channels are already larger than theoretical. The pump cost which is planned to operate for 7 hours is Rp 408,107.14/day while the actual pump operates 4 hours with additional maintenance costs of Rp 174,811.20/day or ± 42% of the planned cost. Making the actual temporary sump is Rp 73,598,773.90 with an additional cost of making the recommended sump of Rp 62,874,123.60 or ± 85% of the actual cost with a total cost of Rp 272,744,273.

Kajian Teknis Pengaruh Variabel Shaking Table Terhadap Peningkatan Kadar dan Recovery Pencucian Bijih Timah Unit di Unit Metalurgi PT Timah Tbk Novrida Siregar; Janiar Pitulima; Haslen Oktarianty
MINERAL Vol 7 No 1 (2022): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v7i1.3332

The Mineral Processing Sector (BPM) is a place for processing precious tin minerals with other associated minerals. This research was conducted because the tin content in table water as feed in processing is still quite economical, namely 9.64% Sn and the minimum level that must be achieved as smelting feed is >60% Sn. The data collection method was carried out by conducting feed analysis with the GCA test to determine the levels and distribution of minerals in the feed. Furthermore, the shake table tool variations are adjusted such as stroke lengths of 15 mm, 22 mm, 10 mm with a sample result of 9 samples and the speed of air flow over the table is carried out as many as 3 variations, namely 0.025 m/s, 0.011 m/s, 0.014 m/s with results of 9 samples. Then the combination of the two variables was carried out with the results of 27 samples. The results of the GCA analysis were carried out to see the effect on levels and recovery. The results of the combination of stroke length and water flow velocity were the most optimal in combination with a stroke length of 15 mm and a water flow velocity of 0.025 m/s resulting in a concentrate of 58.44% Sn, moderately 6.26% Sn, and tailings 2.72% Sn as well as recovery. by 58.49%.

Page 8 of 18 | Total Record : 172

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Editorial Address Gedung Dharma Pengabdian, Fakultas Teknik Universitas Bangka Belitung, Kampus Terpadu UBB, Balunijuk Provinsi Kepulauan Bangka Belitung

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Contact Name
Jurnal Mineral

Contact Email
mineral.ubb@ubb.ac.id

Phone
+6281373020110

Journal Mail Official
mineral.ubb@ubb.ac.id

Editorial Address
Gedung Dharma Pengabdian, Fakultas Teknik Universitas Bangka Belitung, Kampus Terpadu UBB, Balunijuk Provinsi Kepulauan Bangka Belitung

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Kab. bangka,

Kepulauan bangka belitung

INDONESIA