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Jurnal Mineral
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Gedung Dharma Pengabdian, Fakultas Teknik Universitas Bangka Belitung, Kampus Terpadu UBB, Balunijuk Provinsi Kepulauan Bangka Belitung
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INDONESIA
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 18 Documents
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Search results for , issue "Vol 1 No 1 (2016): Mineral" : 18 Documents clear
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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (364.326 KB) | DOI: 10.33019/mineral.v1i1.1602

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.242 KB) | DOI: 10.33019/mineral.v1i1.1603

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.903 KB) | DOI: 10.33019/mineral.v1i1.1605

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (501.399 KB) | DOI: 10.33019/mineral.v1i1.1606

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.2 KB) | DOI: 10.33019/mineral.v1i1.1607

Abstract

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

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.57 KB) | DOI: 10.33019/mineral.v1i1.1608

Abstract

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%.
EVALUASI KEMAMPUAN PRODUKSI ALAT GALI-MUAT DAN ALAT ANGKUT GUNA MENCAPAI TARGET PRODUKSI BATUBARA 180.000 TON BULAN OKTOBER 2015 DI PIT LIMOA TAMBANG AIR LAYA EXTENTIONTIMUR PT BUKIT ASAM (PERSERO)TBK UPTE Maria Jeane Inggrid; E.P.S.B Taman Tono; Janiar Pitulima
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (460.47 KB) | DOI: 10.33019/mineral.v1i1.1609

Abstract

Eastern Extension of Pit Air Laya Limoa Mine was one of Air Laya Mine site that has coal miningbusiness license owned by PT Bukit Asam (Persero) Tbk. Excavator and truck method were applied inthat mine site. Mechanical equipments used in this site were 1 unit of Komatsu PC 800 SE Excavatorand 6 units of HINO LM 500 Dump Truck. Coal production target in Eastern Extension of Pit Air LayaLimoa Mine in October 2015 was 180.000 ton, but the production capacity of load haul equipment was157.179,39 ton with the work time efficiency at 14,07 hour/day and load haul equipment productiononly 129.245,20 ton with the work time efficiency at 13,97 hour/day. Therefore, evaluation wasnecessary throughout factors affecting working performance of mechanical equipment to achieve thetarget. Evaluation in achieving the target of coal production was conducted by calculating theproductivity, work efficiency and match factor. The data required to obtain these values includedequipment cycle time, the effective work time effeciency, the amount of bucket loading, density andcoal swell factor. Then the data was processed by using formula of mechanical soil removal andanalyzed based on literature related to the issue. After the evaluation of factors affectingperformance of mechanical equipments then work time effeciency corrected to be 15,61 hours/dayand additional of 6 to 7 unit of conveyance. There were changes in work time effeciency between loadhaul equipments and conveyance from 0,83 to 0,97. Production capabilities generated load haulequipment after being evaluated was 192.291,14 tons and production capabilities of conveyances,after the evaluation amounted to 188.236,03 tons.
EVALUASI KEMAMPUAN PRODUKSI RIPPING DOZER RIPPER D375 UNTUK MENCAPAI TARGET PRODUKSI BATUBARA 180.000 TON BULAN OKTOBER DI TAMBANG AIR LAYA EXTENTION TIMUR FRONT LIMOA PT BUKIT ASAM (PERSERO) TBK UPTE Gregorius Fredrick; E.P.S.B Taman Tono; Irvani Irvani
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (382.715 KB) | DOI: 10.33019/mineral.v1i1.1611

Abstract

Coal production target in East extension of TAL Limoa Front was 180.000 ton/month in October2015 but the target achieved only 115.967,59 ton with the percentage achievement of productiontarget at 64,4 %. Therefore it was necessary to evaluate performance of Dozer Ripper D375 numberseries DZ 521. The evaluation conducted by taking primer actual data in mine site such as cycletime, work distance, work effeciency, Ripper penetration and then the collecting data was processedto make reparations of DZ 521 type of D375 Ripper with the aim to meet the production target. Theachieved production after prior evaluation conducted by increasing work time effeciency was162.826,57 ton with the production achievement percentage at 90.45 % and the lack production was17.173,43 ton, a further evaluation was conducted by repairing of Ripper penetration performance andthe production was 206.138,22 ton with the production achievement percentage at 114% and theexceed production was 26138,22 ton. Then work time efficiency and Ripper penetration was improvedto obtain target production of 289.475,83 ton with the production achievement percentage at 160%and exceed production of 109.475,83 ton with time reserve 150 hours/month and 4,8 hours/daymaybe can back up the problems on location production. The evaluation had been met coalproduction target of Limoa Front.
Pengaruh Getaran Tanah Akibat Peledakaan Terhadap Kemantapan Lereng Tambang Air Laya Selatan PT Bukit Asam (Persero) Tbk Nur Amaliya; Mardiah Mardiah; Abrianto Akuan
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (674.744 KB) | DOI: 10.33019/mineral.v1i1.1612

Abstract

Rock blasting operation generate deformation as a result of the vibration that will destruct rockmass and cause slope failure to endager the human safety. There are so many geological structuressuch as fault, joint and structures that caused the failure slope in South Air Laya Mine Site. Thereforeit is necessary to conduct a research of the influence of blast vibration on slope stability factor aroundthe area. Stability factor value (FK) was obtained from calculation of Geolsope 2007. Test ofPhysical and mechanical parameter valueincluded value of weight content of soil / rock (w) withkn/m3unit, cohesion (C), shear angle(), plasticity index value (IP) as well as the compressivestrenght (UCS). Vibration value was obtained from the measurement of vibration using BlasmateIII.Vibration value used is Peak Acceleration Tranverse (the greatest point taken). Furthermore, physicaland mechanical parameters data of rock and vibration was processed by using Geoslope2007software.Based on research conducted for 50 days by blasting as many as 15 times. Vibration valueused is 3 vibration greatest value, namely 0.102 g; 0.086 g and 0.084 g.The calculation of slope FKvalue using Geoslope2007 software was obtained the comparison between slope FK before and afterblasting. Slope FK value before blasting was 3,744 to 4,058 and slope FK after blasting was 3,422 to2,783. From the overall of slope FK value, slope in blasting area was conluded in safe category (FK >1,25).
Estimasi Kelayakan Penambangan Bijih Timah Blok Kemingking, Desa Kemingking, Kecamatan Sungai Selan PT Mitra Stania Prima: Tin Ore Mining Feasibility Estimation Block Kemingking, Kemingking Village, District Sungai Selan PT Mitra Stania Prima Daryono, Yuli; Mardiah, Mardiah; Pitulima, Janiar
MINERAL Vol 1 No 1 (2016): Mineral
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/mineral.v1i1.1602

Abstract

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.

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