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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.

Evaluasi Realiasi Bijih Timah TB 1.42 PT Timah (Persero) Tbk Di Pemali Kabupaten Bangka Epi Epi; Mardiah Mardiah; Irvani Irvani
MINERAL Vol 3 No 1 (2018): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

TB 1.42 Pemaliwas managed PT Timah (Persero) Tbk. The mining system applied at TB 1.42 Pemali is a mechanical mining system where the mining system activities are conducted by transferring the excavation result of kaksa from work front to stockpile to be wasted using a jig. In terms of mining productivity, the realization of tin ore production was only 80% from the total production that has been planned by the company on November and Desember. Therefore, an evaluation of factors effecting prodution target is essential to do in order to meet unachieved production target. The research was conducted based on the performance coefficient value of load-haluage and transport equipment productivity in November and December assessed from the productivity of the excavators, loaders, and transforting vehicles in March, which is assumed to have the same condition as that in November adn December. An evaluation was conducted to examine the values of mine, effective usage of working time, and the number of bucket loading. The data is then processed using mechanical eatrhmoving formula.The value of performance coefficientin November and December were 0.9 and 0.8, while the performance coefficient of the company are 1.1 – 1.2. After conducting an evaluation, it is found that the factors that lead to failure in achieving the target of production are the long cycle time of the load-haulage equipment, low efficiency of labor, and low match factors. The efforts that should be taken to increase the realization of target achievement are decreasing the cycle time of the load-haulage, increasing the effective usage of working time, and addin in match factor. The cycle time is shortened to 1.159,5 seconds from the initial cycle time of 1.267,8 seconds. The effective usage of working time is increased to 0.75% from 0.727% and the number of load-haulage is increased to 6 from 4 units. After the changes have been done, the production realization in November and December increasing to 156.21 tons of Sn and 128.59 tons of Sn with performance coefficient value of 1.2, thus the production target of the company is achieved.

Kajian Teknis Alat Gali-Muat dan Alat Angkut Pada Pencapaian Pengupasan Overburden 1.120.000 BCM di Pit Taman Tambang Air Laya Bulan September 2016 PT Bukit Asam (Persero) Tbk Irwan Edel Frudis; Mardiah Mardiah; Janiar Pitulima
MINERAL Vol 3 No 1 (2018): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

In the layer of overburden stripping activities in Pit Taman attainment production amounted about 82% of the production target set in the amount of 925,187.2 BCM of production target of 1,120,000 BCM. This is due to the high resistance factor affecting work efficiency so that production is produced by means of unloading and transportation have not been able to achieve the production target. The data obtained in the field in the form of a data cycle time tools obtained from the calculation of the time distribution of each trencher-fit to perform the excavation, swing content, swing empty and loading and conveyance maneuvering, loading, road to disposal, dumping and back to front as well as the calculation of effective working hours will do the calculation of the amount of productivity. After calculating the theoretically obtained by 1,656,454.08 BCM of overburden production for excavator-unloading and BCM 1,405,890.9 for conveyance. To get productivity achieve production targets then do the optimization tools work plan is to optimize. Optimizing plan working hours adjustment tools and repair equipment capacity are obtained overburden production amounted to 1,914,890.2 BCM. As for after the technical review of the excavator-unloading and conveyance in stripping overburden at Pit Taman in September 2016 on the calculation of production trencher-load transports that have been implemented should only use 3 units of excavator-unloading is 3 units of PC Komatsu 2000 for with the use of 3 units with improvements and performance optimization tools as well as the factors that influence has reached its production target of 1,670,167.71 BCM and for the use of conveyances using Komatsu HD 785 20 units with a production target of 1,615,712.8 BCM.

Perhitungan Sumberdaya Batu Granit Pada Quarry PT Mandiri Karya Makmur Dengan Metode Cross Section dan Metode Cut And Fill Zuhirmanto Zuhirmanto; Mardiah Mardiah; Irvani Irvani
MINERAL Vol 3 No 1 (2018): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Resource calculation studies are an important task in evaluating a mining project. Reserve calculation using the method of cross section and method cut and fill in mining area with extensive Active Block 8 hectares, with elevation limit of mining activity 60 m above sea level. The results of the resource volume of granite using method cross section within the cross section 15, 20 and 25 m is 1.436.967,28 m3, 1.435.887,56 m3 and 1.435.162,056 m3 tonnase 3.736.114,927 tons 3.733.307,656 tons and 3.731.421,345 tons, granite stone resource volume using cut and fill method is 1.437.398,157 m3 with 3.737.235,209 tons tonnage. The results of calculations using the method of cross section with a distance of 15 m smaller cross section 430,877 m3 or 0,03% of the cut and fill method, method of cross section with a distance of 20 m smaller cross section 1.510,597 m3, or 0,11% of the cut and fill method , cross section method with cross-sectional distance 25 m smaller 2.236,101 m3 or 0,16% from method cut and fill. The result of the calculation of the life of mine of PT Mandiri Karya Makmur is based on the calculation of the amount of resources used method cut and fill with a mine life of 31,14 years, cross section method sectional distance of 15 m with a mine life of 31,13 years, cross section method sectional distance of 20 m with a mine life 31,11 years and cross section method of cross- sectional distance of 25 m with mine life of 31,09 years.

Evaluasi Kualitas Batubara dari Front Penambangan Hingga Stockpile di Pit 1 Banko Barat PT Bukit Asam Tbk Tanjung Enim Inda Pratama Putri; Janiar Pitulima; Mardiah Mardiah
MINERAL Vol 4 No 1 (2019): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Mining Pit 1 Banko Barat in Bukit Asam is a mining location that used open pit system of mining. Coal quality is an important part of the mining industry, because it's related directly to coal marketing. Coal sampling test process which determine quality prove that quality in front mining and stockpile is decreasing from recent month with 4903 Kcal/kg. The decreasing in quality will also result in price reduction. Based on that condition, evaluation of coal sampling quality test result needs to be done to discover the cause of quality decreasing, so that various efforts can be made to increase quality to match the price standard. Research method using proximate and ultimate analysis for coal quality. There are 20 coal samples used in the front, 24 samples in stockpile and 8 samples in temporary stockpile. Coal quality in front mining has 28.24% total moisture, 13.8% inherent moisture, 2.11% ash content, 33.81% volatile matter, 35.98% fixed carbon, 0.42% total sulphur and 4,987.5 kcal/kg. Coal quality in stockpile has 28.35% total moisture, 14.26% inherent moisture, 3.73% ash content, 33.87% volatile matter, 34.09% fixed carbon, 0.41% total sulphur and 4,908.5 kcal/kg. Irrelevance factor is caused by water puddle, mining process, coal cumulation that stays too long in temporary stockpile and spontaneous combustion. Efforts that can be done to handle irregularities are drainage system and pump additions, mining process optimization, FIFO management system implementation and spontaneous combustion handling.

Analisis Pengaruh Parameter Kompaksi Terhadap Nilai CBR Berdasarkan Standar dan Kriteria Jalan Tambang PT Bukit Asam Tbk. Tanjung Enim Mitha Elisza; Mardiah Mardiah; Haslen Oktarianty
MINERAL Vol 4 No 2 (2019): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

This study analyzes the effect of compacting parameters on CBR values based on PT Bukit Asam Tbk's standards and criteria. The problem behind this research is that the overburden target at the TAL-West mining site to the South sump disposal is not affected by the speed of the transport equipment which is caused by the damaged road because the carrying capacity does not reach the standard so the circulation time increases. Therefore it is necessary to analyze the effect of compacting on CBR values based on company standards and criteria to meet the production target in April 2019 of 1,500,000 BCM, while the realization only reaches 1,379,160 BCM. The research method used is a linear regression method that analyzes the influence and relationship of independent variables such as material physical properties, compacting parameters and dependent variables, namely CBR values. The results of this study are that the physical properties of material have a relationship and influence on CBR values. Compaction parameters have a relationship with CBR values such as small dry volume weight so CBR value increases while optimum water content is large, CBR value decreases. Based on the evaluation of company standards and criteria, the best material in the B2C-22 sample with water content of 9.49%, density of 2.77, CBR value of 74.87% of the type of inorganic clay with light ash.

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 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.

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

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).

Kajian Produksi Ball Mill Dalam Menentukan Efektivitas Penggerusan Bijih Timah Primer Di CV Persada Tambang Intitama TK 4.218 Paku Kabupaten Bangka Selatan Agus Cik; Mardiah Mardiah; Guskarnali Guskarnali
MINERAL Vol 5 No 2 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

CV Persada Tambang Intitama TK 4.218 Paku is a partner company of PT Timah Tbk, which conducts primary tin mining using the open pit method. Primary tin ore processing includes comminution, sizing, and concentration activities. Grinding using a Ball Mill is an advanced process that aims to reduce the grain size of the material in order to obtain finer grain sizes (fine material) and prepare the right grain size for the concentration process of 80 s.d - 200 mesh. In this study, the variables used are feed rate, number of Ball Mill revolutions (RPM), and water rate. The experiment was used 27 times by setting variables in combination to get effective scouring results. The material at the study site is divided into high grade and low grade materials with primary tin mineralization types in the form of stanniferous veins and gossan formed due to the oxidation process of polymetallic veins. Variable feed rate, number of Ball Mill revolutions (RPM), and water rate are very influential on the results of grinding. The higher the feed rate, the number of turns, and the rate of water the higher the Ball Mill scour, but if the variable is too high it causes overload capacity so that the output volume decreases. The effectiveness of the grinding results obtained in sample 24 with the highest production value reaching 93.9%. The effective value is obtained from setting the feed rate variable 5 to 6 Ton Per Hour (TPH), 80 rotation RPM, and water rate of 10.800 liters/hour (l/h). The result of the maximum feed rate that can be done is 9.86 TPH with LPT is 236.64 ton/day. Thus, the average LPT target of the company's 230-240 tons/day Ball Mill can be achieved

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