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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 156 Documents

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Analisis Penggunaan Powder Factor Terhadap Fragmentasi pada Lubang Ledak Vertikal dan Inclined di PT Aditya Buana Inter Muhammad Rafliansyah1; Irvani Irvani; Haslen Oktarianty
MINERAL Vol 4 No 2 (2019): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Based on the observations in PT Aditya Buana Inter it is known that the vertical blast hole blasting geometry is an average of burden of 2.5 m, spacing 2.413 m, height 6 m, stemming 2.3 m, primary charge 4 m and diameter of 3 inch or 0.076 m blast hole, the amount of explosives used is in average 667 kg each blasts and the result of the volume rocks in average 2090,25 m3 or 5225,63 tons and has average powder factor value is 0.318kg/m3 with the average of fragmentation is 72.05 cm. Forthe inclined blast hole blasting geometry is an average of burden of 2.5 m, spacing 2.413 m, height 6.21 m, stemming 2.3 m, primary charge 4.21 m and diameter of 3 inch or 0.076 m blast hole, the amount of explosives used is in average 231 kg each blasts and the result of the volume rocks in average 718.44 m3 or 1796,1 tons and has average powder factor value is 0.321 kg/m3 with the average of fragmentation is 26,82 cm. The right of proposal design the blasting geometry in the field by calculating the inclined blast holes with 15° slope, using the evaluation blasting geometry actualobtained has modification blasting geometry with the good calculating which is burden 2.5 m, spacing 2.5 m, stemming 2.56 m, height level9.21 m, subdrilling 0.6 m, and primary charge length7.25 m.The result for a Powder Factor was more efficient which is 0.260 kg/m3 compared with the blasting geometry actual the vertical blast hole is 0.318 kg/m3 and the blasting geometry actual the inclined blast hole is 0.321 kg/m3, and the distribution of rock fragmentation resulting from blasting which corresponds to the target where rocks measuring> 100 cm to 0% compared to the actual geometry of vertical explosive holes of 29.6%.

Analisis Keberhasilan Reklamasi berdasarkan Keputusan Menteri Energi dan Sumber Daya Mineral Nomor 1827 Tahun 2018 pada Lahan Bekas Tambang Air Jelitik 3 PT TIMAH Tbk Kabupaten Bangka Guskarnali Guskarnali; Regita Kasih Parenty; Delita Ega Andini
MINERAL Vol 4 No 2 (2019): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Timah Tbk is a mining industry company which produces the tin metal. A mining former area which is chosen as the research location is Lahan Air Jelitik 3. This research aims to analyze the success of Lahan Air Jelitik 3’s reclamation based on Matrik 16 and Matrik 17 of Keputusan Menteri Energi Sumber Daya Mineral Nomor 1827 Tahun 2018. The research starts with collecting the primary data which consists of 43 and 29 coordinate points of Lahan Air Jelitik 3’s adjustment and revegetation, the length and width of 22 erosion in Blok 1, 24 erosion in Blok 2 and 4 landslide in both blocks, the height and diameter of 35 primary plants and the length of 5 cover crops. Those primary data and secondary data are processed by calculating the broad realization of Lahan Air Jelitik 3’s adjustment and revegetation, the amount of plants, the average of plant’s height and diameter, the stability of area and valuating the success of adjustment area, the success of revegetation, the success of last completion based on Matrik 16, also calculating the success reclamation value based on Matrik 17. The result of data processing shows the success value of adjustment and hoard area is 0.5, top soil’s spreading is 0.91, erosion and sedimentation’s control is 0, cover crop’s revegetation is 0.86, fast growing plant’s revegetation is 0.1765, local plant’s revegetation is 0.726, acid mine drainage’s management is 0, plant’s closure is 0.1059 and plant’s maintenance is 0.333. The reclamation’s success percentage 50.65% in Lahan Air Jelitik 3 PT Timah Tbk shows that the reclamation in that area is not good enough and the area needs improvement especially in plant’s maintenance, erosion and sedimentation’s control and acid mine drainage’s management.

ANALISIS BREAK EVEN POINT HASIL PELEDAKAN BATU GRANIT PADA UNIT PELEDAKAN PT ADITYA BUANA INTER DI KECAMATAN MERAWANG KABUPATEN BANGKA Vikram Rinaldi; E.P.S.B Taman Tono; Irvani Irvani
MINERAL Vol 4 No 2 (2019): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

The process of mining granite in PT Aditya Buana Inter is mined with an open pit (quarry)system. The granite blasting system at PT Aditya Buana Inter consisted of 5 blasting and with 386holes of explosive holes obtained, the total institutional volume was 199.996 m3 (BCM) and the totalvolume of blasting was 13001, 7 m3 (BCM) of the target company of 16,000 m3 (BCM) / month. Drillingand blasting activities to produce blasting volumes of course there are factors that influence theseactivities. Factors that influence drilling and blasting activities affect the costs incurred and the volumeof blasting results produced, the factors that influence these activities include: weather, frontconditions, equipment damage, less optimal blasting geometry measurements. The activity is certainlynot inseparable from the costs that must be incurred by PT Aditya Buana Inter both fixed costs andvariable costs. The total costs incurred by PT Aditya Buana Inter on September 2, 2018 to October4, 2018 are Rp 352,677,200.00 which includes fixed costs of Rp 170,616,020.00 and variable costs(variable costs) of Rp 182,061,000.00, and variable costs per m3 the volume of blasting yield is Rp14,003 /m3. Break even points obtained from calculations for units are 812,468 m3 and in rupiah Rp181,992,901.00. PT Aditya Buana Inter income from the sale of split stone is Rp 472,846,080.00obtained from the sales volume of 2110.92 m3 with a selling price of Rp 224,000 /m3, the profit (L)obtained is Rp 90,610,140.00. Calculation of Break Even Point analysis can determine the minimumamount of volume of rock from the blasting that will be produced and to find out the condition of thecompany not making a profit and also not losing.

Pengaruh Kecepatan Aliran dan Debit Aliran Terhadap Peningkatan Perolehan Konsentrat Bijih Timah Dalam Tailing Pada Alat Secondary Lobby Box Skala Laboratorium E.P.S.B Taman Tono; Dede Seiawan; Janiar Pitulima
MINERAL Vol 4 No 2 (2019): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Tailings are the result of the process of mining or processing mineral ore which is considered tohave no economic value. The g in the tailings as evidence that there are losses of cassiterite mineralsthat are also wasted is still of economic value. To reduce losses of cassiterite minerals in tailings, thetool used is the secondary lobby box. The washing of tin tailings was carried out 6 times including theflowrate and the speed of the water flow given differently affected by the opening of the water faucetthat forms the angle of partition on the secondary lobby box. Each of these angles is 15⁰, 30⁰, 45⁰ ,60⁰, 75⁰, and 90⁰. From each experiment a bait was used in the form of tailings with a weight of 5 kgeach (0.47% Sn). At faucet position 15⁰ flow rate of 20.5 l/minute and water flow rate of 0.017 m/secproduced 1.19% Sn and recovery at 76%, position 30⁰ flow rate of 23.5 l/minute and water flow rate of0.020 m/sec produced 1.22% Sn and recovery at 73%, position 45⁰ flow rate of 26 l/minute and waterflow rate of 0.022 m/sec produced 1.25% Sn and recovery at 68%, position 60⁰ flow rate of 28.7l/minute and water flow rate of 0.025 m/sec produced 1.28% Sn and recovery at 65%, position 75⁰flow rate of 32.6 l/minute and water flow rate of 0.028 m/sec produced 1.30% Sn and recovery at53%, and position 90⁰ flow rate of 41 l/min and water flow rate of 0.035 m/sec produced 2.26% Sn andrecovery at 50%. The highest concentration of 2.26% Sn and the desired recovery in the tailingsseparation process is the lowest recovery of 50% in the 90⁰ faucet position. This shows that theprocess of separating products in the form of tailings has increased significantly from the feed contentof 0.47% Sn to 2.26% Sn and transforming tailings products into economically valuable ores.

Estimasi Kelayakan Penambangan Bijih Timah Blok Kemingking, Desa Kemingking, Kecamatan Sungai Selan PT Mitra Stania Prima Yuli Daryono; Mardiah Mardiah; Janiar Pitulima
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

The mining industry is in need of a good planning so that the planned production targets can beachieved at minimum cost and revenue optimally, and can generate cash flow that will maximizerevenue each year over the life of the mine took place. Tin ore mining economic studies based onthe technical design data, so that the determination of the cost will be considered by the company.Components of the economic study of tin ore mining in terms of costing, revenue from the sale ofproducts, the calculation of cash flow, net present value, internal rate of return, payback period,sensitive analysis. Based on the results of studies on tin ore mine PT Mitra Stania Prima BlockKemingking acquired total reserves of tin ore amounted to 2.801,531 tons, by applying the method ofmining Open Pit Mining. From the economic feasibility calculations assuming the bank rate of 12%was obtained net present value of Rp 11.810.941.184.00, internal rate of return of 19.04%, and apayback period of 4.78 months for 2 years. Based on these results the project of PT Mitra StaniaPrima Block Kemingking feasible to continue.

Kajian Teknis Sistem Penerisan Tambang Di Front 2 TB 2.2 Tempilang Bangka Mitra PT Timah (Persero) Tbk Ines Yuana; E.P.S.B Taman Tono; Janiar Pitulima
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Tin ore mining activities in Front 2 of 2.2 Tempilang Large Mine was operated by business partnerof PT Timah (Persero) Tbk, PT Bahtera Sarindo Utama used Open Pit Mining Method with mechanicalsystems. Open Pit Mining Method would eventually form a large basin, so that would become a placefor air accumulation at the base of mine site, applied drainage system used Repressive KuruativeDrainage System by allowing water to pour into the mine and then concentrated on the front sump andthey would be removed from the mine using pumping systems. Rainfall data used included amaximum rainfall data with period of 2005-2014, the calculation of rainfall plans used Gumbeldistribution and calculation of rainfall intensity with Mononobe Equation, but for the period of rain istaken with the 2-year period. From the research, the existing sump had capability to retain water with avolume of 79.5 m3 and existing pumps had the capacity of 86.4 m3/h, while the total water poured inthe mine was 2172.588 m3/day with total of catchman area was 64085.442 m2. To improve drainagesystem performance on Front 2 of 2.2 Tempilang Large Mine, dimensional sump need to be repairedwith a capacity of 1267.336 m3 to bring outwater volume plan outside of work time (14 hours) and analternative pump was add 1 unit of recommendation pump with the same type such as Mitshubisi6D16 gravel pump (engine) with a pump capacity of 154.8 m3/h, but the actual pump was still beingused so that with the use of two unit pump acquired total pump capacity was 241.2 m3/h with thelifetime of pumping was 9 hours to remove the water 2172.588 m3/per day.

Analisis Kestabilan Lereng Menggunakan Metode Slope Mass Rating (SMR) dan Software Geoslope/W 2007 pada Tambang Air Laya Selatan Lokasi Suban Di PT Bukit Asam (Persero) Tbk Nabila Faradibah; Yayuk Apriyanti; Irvani Irvani
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Bukit Asam (Persero) Tbk was one of the Indonesian State Owned Enterprises which conduct tocoal mining. During the process of coal mining, demolition overburden resulted in a change of forceand also set up new structures and caused differences in stress distribution thereby changing thestrength of the rock mass. This result the mining slope becomes unstable and could cause a lot ofharm, therefore the analysis of slope stability was carried out. This study was conducted todetermine the quality of the rock mass slope based on the value SMR (Slope Mass Rating), directionof failure using the analysis of kinematics by Dips software and Safety Factor value (SF) based onMorgenstern Price method using Software Geoslope / W 2007. The data used in this study includesdata UCS, RQD, spacing of discontinuity, discontinuity conditions, groundwater conditions and data ofdiscontinuity orientation. Data retrieval was divided into 9 scanline slopes. The analysis indicatedquality of the rock mass and degree of slope stability based on the SMR for scanline I, VII and IX werevery good with a very stable condition, Scanline II, III, IV, V, VI and VIII had good quality with a steadyslope conditions. The Possibility of slope failure occured only in several blocks for Scanline II, IV, V, VIand VIII. After the analysis of kinematics for Scanline III, IV and V had directions of failure to ScanlineIII was N 490 E, Scanline IV was N 500 E and Scanline V was N 480 E. Values of Safety Factor (SF)single slopes from 9 scanline was estimated to 3.254 - 44.737 (safe condition) and the overall slope of1.85 to 4.09 (safe condition). It was concluded that overall the existing slope on the location Subanwere in a safe condition for SF value >1.25.

Kajian Teknis Metode Backfilling Dengan Cara Mekanis Pada Penambangan Timah Alluvial Di TS 1.44 Mapur Kecamatan Riau Silip Kabupaten Bangka Induk PT Timah (Persero) Tbk Nugrahani Trie Ryzzky; Mardiah Mardiah; Abrianto Akuan
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Open pit mining system for the class under TB as TS has reserves of alluvial tin, so that the postmining activities in particular using the backfilling method. Backfilling method that would be examined wasthe backfilling method by mechanial means. The study was conducted in TS 1.44 Mapur PT Timah(Persero) Tbk. Data processing to be performed was the cycle time calculation of heavy equipmentsuch as excavator, dump trucks and bulldozer using to measure time of backfilling, time of stripping,production capacity and match factor. The calculation of machine cost to calculation cost of backfilling.The measurement hole of backfilling and stripping to calculation the volume of backfilling and the volumeof overburden. Calculation time for persentage of effeciency work tools. Based on research obtainedbackfilling activities was a stage open new worked front that stripping, used the excavator loading materialinto a bath of dump truck, dumping into the hole in backfilling and leveled material used bulldozer.Backfilling volume of 171.390 m3 from pegs base and 87.000 m3 from TLR, have a difference of 84.390m3. Backfilling for 41 days with the cost of Rp 675.100.000. Stripping volume of 150.000 m3 to 63.000 m3of excess soil and stripping for 70 days. Production capacity of excavator 49.364,17 m3/month, dumptrucks 39.491,33 m3/month and bulldozer 300.249,09 m3/month. Effeciency of three equipment by0.786%. Match factor results by 72%, means unloading excavator having waiting time while dump truckwork 100%. The production of less than the maximum, so we need the add of 1 unit of dump truck so thatthe tools fit the excavator does not happen the wait time, dump trucks became to 4, it 96% or MF = 80% -100% and productifity would be maximum.

Evaluasi Pengaruh Tie-Up Peledakan Terhadap Getaran Pada Penambangan Batu Granit PT Mandiri Karya Makmur Di Desa Tanjung Gunung Kecamatan Pangkalanbaru Lenny Lenny; Irvani Irvani; Abrianto Akuan
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Mandiri Karya Makmur is a private mining company that mine granite rock located in CentralBangka Regency Area.The main activity in extracting granite rock was conducted using blastingmethod. Blasting acitivy could influence invironment around mine site, including community.Therefore, it was necessary to evaluate blasting activity, especially tie-up to decrease vibration fromblasting activity itself. The method used to make design of tie-up was using shotplus-i program. Theaims in this research was to set up surface delay and the use of time window in order to determineamounts of similar blasting holes. The data used including sounding data and blast design todetermine PPV value. The value was calculated by using empirical formula of U.S.B of Mine No 656 of1971. The actual geometry used including burdens 1,8 m, spacing 2,3 m and hole depth rate 6 m.Then, determining the measurement of vibration was using Android based vibrometer. The result ofappropriate tie-up evaluation used in blasting was Box cut pattern, surface delay 25 ms and 42 mswith inisiation of left corner using time window 8 ms and similar blasting holes was 3 holes. Thisamount could minimize vibration. Actual PPV value was 0,7 mm/s, PPV recommendation value of 3,3mm/s and SD value of 19,6 m/kg. The cavacity of explosive was 932 kg and minimum safe distance of598 m from blasting point. It was categorised still safe referring to Building type theory of number 2(SNI 7571 : 2010).

Evaluasi Kinerja Pemindahan Overburden Ditinjau Dari Produktivitas Alat Gali- Muat dan Alat Angkut di Front Kerja 2 TB 2.2 Tempilang Kabupaten Bangka Barat Mitra PT Timah (Persero) Tbk Desi Fatimah; E.P.S.B Taman Tono; Irvani Irvani
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

TB 2.2 Tempilang is managed by partner of PT Timah (Persero) Tbk. Mining system that applied is asystem of mechanical mine, where mining activities carried out by moving the overburden materialprior to mine kaksa layer. The problem that occurs was the productivity of conveyance on the actualcondition only 98.76% of target had been determined, which led to their failure in overburden removalvolume amounted to 1.24%. Therefore, it was necessary to do an evaluation of the performanceaffecting factors of load haul equipment and conveyance in the field. Evaluation was carried out bycalculating the value of productivity, work efficiency and Match factor. The data required includedcycles time data, effective working time, the amount of bucket loading, the type of overburden materialand haul road geometry. Then the data was processed using the formula of mechanical soil removaland analyzed based on the literature related to the problem. The factors causing productivityconveyance has not reached the target after the evaluation due to low efficiency of work, the leastamount of bulk bucket loading, and the low value of match factors. The Alternatives can be done toimprove the productivity of conveyance is to increase the effective work time, additional of bucket loadhaul equipments and additional of conveyances. Effective work time should be increased from 12.34hours to 14.23 hours, so the work efficiency become 79.03% from 68.58% to the achievement ofproduction is 113.80%. Bulk bucket should be added from 15 times to 20 times, so the productivitybecome 131.68 m3/hour of 98.67 m3/hour. Conveyance which is originally 2 units coupled into 3 units,resulting in a change of match factor equipment performance from 0.69 to 1.04 with the achievementof production is 141.14%.

Page 5 of 16 | Total Record : 156

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

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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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Jurnal Mineral

Contact Email
mineral.ubb@ubb.ac.id

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+6281373020110

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mineral.ubb@ubb.ac.id

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

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Kab. bangka,

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