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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 112 Documents

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PERENCANAAN TEKNIS OPERASI PRODUKSI BIJIH TIMAH DI BLOK 3 TAMBANG BESAR 2.1 MITRA PT TIMAH (PERSERO) TBK Awwab Hafizh; E.P.S.B Taman Tono; Anisa Indriawati
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

The process of tin ore mining in TB 2.1 is conducted by channeling slurry (the mixture of ore and water) from the stock pile into the washing unit by using slurry pump. Now, TB 2.1 is planning block 3 for the operation of tin ore production proceess. Thus, a good technical planning in accordance with the characteristic of tin ore in TB 2.1 and evaluation of operating system design in Block 1 are necessary. The sample of tin ore concentrate is taken as many as 250 gr from the washing unit to detect P80 of particle size distribution (PSD) of sample. The data of sucker and pressure pipe’s lenghth, store tank’s height, quantity of primary and secondary jig and tin ore monthly production are required to furthermore plan the mining design, washing plant and equipment needs in the drying unit. Based on the research findings, It is obtained the grain size distribution of tin ore is 1.001 mm, so that the amount of lifting velocity is 3.27 m/s. Slurry pump discharge with a pipe’s diameter of 10 inches is 54 m3/hour, while total head of mining design is 30.23 m. Width of launder required is 6.5 m and equipped with two Grizzlies. Washing plant requires three units of primary Jig (2 × 3 cell) and a unit of secondary jig (2 × 3 cell). Adding rotary vibrating screen, shaking table and rod mill are necessary for process optimization in the drying unit.

Optimalisasi dan Produktivitas Alat Gali-Muat dan Alat Angkut pada Tambang Batu Granit PT Vitrama Properti di Desa Air Mesu, Kecamatan Pangkalan Baru, Kabupaten Bangka Tengah Muhamad Nasuhi; E.P.S.B Taman Tono; Guskarnali Guskarnali
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Granite mining activity of PT Vitrama Properti is done by blasting system followed by work combination of one unit Excavator serve four units Dump Truck with a production target of 60.000 tonnes/month. The method of this research is quantitative descriptive to know achieving optimization and productivity Excavator-Dump Truck and efforts are needed to achieve the production target. The results of this research that digging and transport activities not run optimally seen from the low efficiency of work, which only reached 46,57% for digging activity and 40,51% material transport activities of the actual productivity of 29503,44 tons / month for Exacavator and 20754,72 tons / month for Dump Truck. Efforts are needed to achieve the production target is to make improvements circulation time of Dump Truck, increase the work efficiency of digging-transport activity and adding charging frequency to vessel Dump Truck.

Evaluasi Produktivitas Crushing Plant Untuk Pencapaian Target produksi 30.000 Ton/Bulan Batu Granit PT Mandiri Karya Makmur Di Desa Tanjung Gunung Kabupaten Bangka Tengah Firmansyah Firmansyah; E.P.S.B Taman Tono; Janiar Pitulima
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Mandiri Karya Makmur is one of private company that engaged in sector of mining and processing of granite rock located in Tanjung Gunung village, Central Bangka Regency with production target of 30.000 ton/year. PT MKM operates 1 unit of crushing plant as a place of granite rock crushing process in order to produce the size of granite rock product that suit to consumer demand. However, The production target of determined crushing plant had not been reached.The aim of this research was to assess the real productivity of crushing plant of PT MKM. The data used in in this research included work time data, the amount of obstructive production time, weight of rock sample and belt conveyor velocity. The Data had functions to assess the availability of equipment and the real productivity of crushing plant. It recommended to repair crushing plant in order to increase the productivity from the result of calculation data.The result of crushing plant analysis in field showed that installed production equipment was 56.250 ton/month, 18.738 ton/month of maximal production, and the real crushing production achieved of 8.848,5ton/month.The availability value of crushing unit, mechanical availability (MA) was 62.5 %, phisycal availability (PA) 71.66 %, use o availability (UA) 65.89 %, effective utilization (Eut) 47.22 %, effective work time 4.25 hour/day and work efficiency 47.22 %. From the condition, production target had not been achieved. The efforts can be conducted to repair crushing unit in order to meet production target such as : 1) To change production target to 15.000 ton/month, 2) To decrease delay time caused human errors (non technical) will raise effective work time from 4.25 hour/day to 6.45 hour/day and will raise productivity as big as 4.580,5 ton/month, from 8.848,5 ton/month to 13.429 ton/month, 3) To change crushing plant

Analisa Pengaruh Ground Vibration terhadap Stabilitas Low Wall Blok Muara Tiga Besar Utara Pit Timur Menggunakan Software GeoStudio 2012 di PT Bukit Asam (Persero) Tbk, Kabupaten Muara Enim Deza Pahlevi Antasari; Irvani Irvani; Anisa Indriawati
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Ground vibration will produce variable Peak Particle Acceleration (PPA) which endanger the stability of the slope especially low wall. This study discusses the effect of ground vibration on the stability of the low wall and restricted in Block MTBU East Pit. While the slope analysis conducted by the method of Morgenstern-Price (1965) Manually and Software GeoStudio 2012, as well as statistical regression analysis approach in finding a relationship between the variables SD-PPA and PPA-FK. The higher the value of the PPA will lower prices Safety Factor (FK) of slope, proved to vibration FK 0.0133 g yield of 1.258 (C-C’) and 1.292 (D-D’), whereas the vibrations of 0.225 g yield of 0.771 FK (C- C’) and 0.768 (D-D’). The relationship between the scaled distance (SD) of the PPA produces non-linear relationship on a graph of power. The relationship between PPA against FK produces a linear relationship on the Section C-C’ and Section D-D’. The proposal obtained at a distance of 200 m from the blasting area 29.352 kg and at a distance of 500 m is 183.447 kg maximum load of explosives.

Evaluasi Produksi Kaksa Dalam Upaya Pencapaian TargetPemindahan Tanah Bulanan Sebesar 30.000 m3 DI TB.2.1 Tempilang, PT Timah (Persero) Tbk Pisca Ramona; Irvani Irvani; Mardiah Mardiah
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Earthmoving target of 30,000 m3 in TB.2.1 Tempilang reached in March where production amounted to 36.350 m3, but the decline occurred in April at 1,83% with amount of production is 29.450 m3 and in May 46% with amount of production is 16,200 m3. Evaluation was conducted against the data rate of excavation In March until May, 2016. Other than that, evaluation of factors of production activities the influential hearts with how to calculate productivity tool for the reviews to know the tool's ability to produce kaksa, reviewing data that stop-time increasing production, the rate of rainfall, and sediment property value with the observe incision drill profile block in March, April, and May 2016. Based on the findings of evaluation, main factors failure achievement of production is time road experienced a decline of 05 hours during the month of April and 138 hours In May due to damage to the equipment and high rainfall reached 332 mm. Monthly soil removal target can be achieved with change hours number: Available 8 hours / day Being 10 hours / day.

Pengaruh Pengurangan Setting Time (Wait on Cement) pada Semen Tahan Api dengan Penambahan Oil Well Cement Bayu Rahmadika; Yayuk Apriyanti; Irvani Irvani
MINERAL Vol 2 No 1 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Underground Coal Gasification (UCG) is a technology to extract coal deposits in the form of gas from mineral deposit without disassembling of overburden. There are some initial processes in UCG, one of them is cementing to glue the casing into the formation. This research-based laboratory using cement mixture that consists of Fire Mortar as the main ingredients with added Oil Well Cement (OWC) by 40%, 42.5%, 45%, 47.5%, 50%, 52.5%, 55%, 57.5% and 60% of the total weight of the cement mixture. Cement samples were then tested with hydration heat test, furnace test at temperatures of 300°C to 900°C and UCS test of a sample at normal temperature as well as samples that have undergone combustion at a certain temperature. Composition of OWC>50% have faster setting time on the 29th to 40th hours with maximum hydration temperature of 34.4°C on the 11th to the 12th hour as well as getting the optimal composition of Fire Mortar which is 42.5% and OWC which is 57.5%. Composition of 50-60% Fire Mortar have a heat resistance to a maximum of 900°C so they don’t experience failure and cracks which make a sample split. Ofter than that, composition of 50-60% OWC on average have a greater compressive strength with the highest compressive strength value of 1.75 MPa at a temperature of 500°C.

Kajian Teknis Penggalian Lapisan Tanah Atas dan Kaksa untuk Meningkatkan Laju Pemindahan Tanah pada Kapal Keruk 21 Singkep 1 di Perairan Air Kantung, Sungailiat, Bangka Aleo Saputra; E.P.S.B Taman Tono; Guskarnali Guskarnali
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

One of the parameters of dredgers succeed is the rate success of overburden and kaksa per hour. For Dredger 21 Singkep 1 in September 2016 its LPT reach 493 m3/h, so it is still not yet achieved the ideal LPT dredger with bowl measuring 24 cuft of 782,44 m3/hour. The technical study on the excavation of top soil and kaksa done through the stages of research that consists of data collection, grouping the data as well as data processing and analysis. The results of this study indicateLPT ideal on the excavation of top soil for 978,05 m3/hour can be achieved by setting an average depth of 0.54 m emphasis ladder on the side wire speed of 6.82 m/minute and the pull wire speed setting aside that is equal to 8,04 m/minute at an average depth of 0.46 m emphasis ladder, while ideal in the excavation layer kaksa’s LPT of 586.83 m3/hour can be achieved by setting an average depth of 0.26 m emphasis ladder on the side of the wire speed 8.73 m/minute and the pull wire speed setting aside of 11.16 m/ minute at an average depth of 0.20 m emphasis ladder. LPT excavation of topsoil using face long methods reaches 845.38 m3/hour, or an increase of 19.7% from the LPT on short face methods that is equal to 652.78 m3/hour.

Pengaruh Penambahan NaOH dan Ca(OH)2 Terhadap Penurunan Kadar Logam Berat (Fe) di Kolong Tambang 23 Desa Kimhin Kecamatan Sungailiat Elgatania Dwi Apriastuti; Mardiah Mardiah; Janiar Pitulima
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Tin mining activity causes a lot of opening pit known as kolong in Bangka Island. Ecologically, kolong has function as retention reservoir that contain harmful acid water. Tin mining ex-pit potentially causes environment effects especially the quality and quantity of water contained heavy metal. One of kolong in Tambang 23 Kimhin Village of Sungailiat subdistrict contain a quite high of heavy metal of Fe in amount 2.18 mg/L that tested from the result of testing of Health Official Laboratorium of Bangka Regency. Therefore, this research conducted to decrease metal grade in the water kolong. This research focused based on metal grade of Fe value. Analysis conducted by counting the decrease of percentage of Fe metal grade. The method used in lowering metal grade was precipitation method using NaOH and Ca(OH)2 solution. Metal grade analysis used spectrophotometer. The aim of this research was to determine the influence of solution concentration, precipitation time and solution influence of NaOH and Ca(OH)2 in lowering Fe grade. The result of research showed the influence of adding precipitation of NaOH and Ca(OH)2 with the precipitation time. The longer time of precitipation, the bigger percentage of lowering Fe metal. The biggest percentage of Fe metal grade was on concentration of NaOH 6% and Ca(OH)2 3% with the lowering percentage of 88.99% and 96.33% respectively. The optimum time to precipitate Fe metal was in 60 minute. Based on research result showed that precitipation of NaOH better than Ca(OH)2.

Perencanaan Tambang Secara Manual dan Software Micromine Sebagai Pembanding Pada Kapal Keruk 21 Singkep 1 Di Laut Air Kantung, PT Timah (Persero) Tbk Elisa Elisa; Irvani Irvani; Janiar Pitulima
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Dredger 21 Singkep 1 is a mean of production offshore tin mining owned PT Timah (Persero) Tbk, which in 2016 is located in the Air Kantung Sea. Before the implementation of the necessary mining mine planning as a guide to provide an overview of work in the field conditions. Mine planning studies considering the economical extraction and analysis of the operations of dredgers by applying two ways; manually which reserves calculations using the Poligon Methods (Area Of Influence) with sea drilling spacing of 100 × 100 m and assisted Software Micromine as a comparasion. Based in the calculation, the value of the break even production of 42 tonnes ore/month and the break even grade of 0,23 kg/m3. Mining in May to October 2017 to continue the old location to the position of excavation to the northwest. Results obtained Idh manual production planning (Content Calculated) 1.263.980 m3, TDH (Tin Calculated) 0,292 kg/m3 and PDH (Production Calculated) 369,69 tonnes, while the calculation of Micromine obtained Idh 1.271.379 m3, Tdh 0,273 kg/m3 and Pdh 347 tonnes. Fault tolerance value 0,58%. Repair manual planning the excavation efficiency is obtained Idh 1.283.847 m3 increased 1,55%, Tdh 0,327 kg/m3 increased 10,7% and Pdh 409,37 tonnes increased 11,85%. Based on the analysis of drill profiles, the most effective method of extracting using combination system, where the overburden excavation with long face method and leaded soil with short face method.

Evaluasi Titik Impas Biaya Peledakan Batu Granit Bulan Januari 2017 Melalui Perbaikan Metode Peledakan Pada PT Vitrama Properti Di Desa Air Mesu Kabupaten Bangka Tengah Hendra Susanto; E.P.S.B Taman Tono; Janiar Pitulima
MINERAL Vol 2 No 2 (2017): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Vitrama Properti is one of the private companies that run on the mining field, namely the mining of natural resources of granites. In this study, the researcher observes the cost of explosion used by PT Vitrama Properti in its mining of granites. According to the economic analysis, to determine the cost of explosion need to count on the breakeven point. The method employed in this research is to analyze the breakeven point. Breakeven point is a calculation used to know the volume of explosion rate so that the total income and total cost will be at the breakeven point. The data collection is conducted from December 2016 to February 2017, including the data of drilling cost, explosion usage cost, the salary of employees and contract employees, excavators and dump trucks fuel cost, equipment ownership cost, and the specification of explosion tools and equipment. The result of the data analysis shows that the total explosion cost paid by PT Vitrama Properti in January 2017 is Rp.1,041,936,063,00 and the total income earned is Rp.1,287,134,940.00, so the total profit made is Rp.245,198,976.00. Whereas, the breakeven point of PT Vitrama Properti in January 2017 is on the explosion volume rate of 23,109.08 m3 with the total earning and total cost is Rp.841,170,781.00. One of the significant factors to reduce the cost of explosion is to improve the geometry of explosion and to make the effective use of ANFO. After implementing the improved geometry of the explosion, the breakeven point is also improved from the volume rate of 23,109.08 m3 to the volume rate of 21,090.35 m3. Also, to increase the income from the explosion process can be done by increasing the sale of granite from the explosion (boulder) into 7,072.17 m3 with the total income of Rp.257,426,988.00, as well as by increasing the total product sale of 24,752.59 m3 with the total income obtained of Rp.900,994,458.00.

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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