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Geometry Evaluation of Mine Road Based on AASHTO 73 to PT Semen Padang’s Hauling Devices Fuel Needs Ghina Qatrunnada; Guskarnali Guskarnali; Haslen Oktarianty
MINERAL Vol 5 No 1 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

This research examines the geometry of haul roads found at Front Mining 242 towards Crusher VI PT Semen Padang, West Sumatra. This research is based on the results of previous research that there are slope and width that is not in accordance with AASHTO standards on several segments in the mining location. The research also examined the fuel consumption of Komatsu HD785 and Caterpillar 777D haulage devices. This research was conducted by taking data of road geometry using GPS Geodetic and roll meter. Haul roads are divided into several segments with a spacing of about 100 m each. Fuel consumption is calculated based on total resistance received by haulage devices. The evaluation results of the haul road from Crusher VI to Front Mining 242 are the width of the haul road for the two lines in the straight line is 24.1 m, the average width of the actual road is 19.58 m. The width of the haul road for the two lanes on the bend is 24.88 m, the average road width on the actual bend is 21.63 m. Bend radius according to standard 22.81 m, in actual conditions Points M17 and M36 do not meet the standard. The slope of the road according to the standard is 10%, the actual condition averages 13.31%. The amount of cross slope according to the standard is 48.2 cm, the actual condition averages 0 cm. The use of Komatsu HD785 fuel is greater than 15.97 l /rity compared to Caterpillar 777D with a total of 14.98 l/rity. The use of Komatsu HD785 fuel on the recommended road with bend radius 22.81 m to 10.58 l/rity and at the radius of bend 33.35 m to 9,90 l/rity. The use of Caterpillar 777D fuel on the recommended road with bend radius 22.81 m to 8.92 l/rity and at the radius of bend 33.35 m to 8.35 l/rity

Analysis Of The Effect Of Blasting Pattrerns On Ground And Building Vibration Levels Around The Mine At Blasting In Pit 2 Banko West PT Bukit Asam Tbk tanjung Enim, South sumatera Province Indra Hot Daniel Hutasoit; Irvani Irvani; Haslen Oktarianty
MINERAL Vol 5 No 1 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Bukit AsamTbk is one of the coal mining companies in Indonesia that uses an open pit mining system. Demolition of B2-C overburden rocks at the location of electrification mining in Pit 2 Banko Barat is not economical if it is doing by ripping-dozing process so that drilling and blasting activities are carried out. After blasting activities, ground vibration will arise as an effect of the blasting. It is known that the distance of the blasting location with the residential area is at a distance of 1350-1800 m for this reason that vibration measurements must be carried out with the Blasmatet III device. Ground vibration is one of the problems that must be minimized so that the ground vibration level is in accordance with SNI 7571; 2010 did not exceed the vibration threshold that could cause damages, especially for residents. The ground vibration level can be controlled in various ways such as setting the point initiation point, setting the delay time with a higher value, planning the powder factor and finally using the Air deck method. Based on research carried out for 60 days with blasting 17 times which produces different vibrations. The vibration value used for the comparison of the effects of the blasting pattern is used in 6 data, 3 data for the Box cut blasting pattern, which are 0.52, 0.53, 0.56 and for data on the Corner cut blasting pattern which is 0.63, 0.69, 0.73. While for the comparison of data using Air deck, 6 data are used, 3 values of the results of the vibration of the water deck method are 0.73, 0.69,58 and for non-Air decks the results of the vibration are 1.17, 1.05, 0, 88. Calculation of the results of the comparison of the vibration comparison using the delay time there are 6 data used, namely 3 with a delay time of 42 & 67 with the results of vibration, namely, 0.58, 0.69, 0.73 while the delay time 42 & 109 the result of vibration is 0.50, 0.56, 0.58. Of the overall soil vibration values, settlements around the blasting area are in the safe category (PVS <3 mm / s).

Analysis of Distance On Ground Vibration at Around Residential Areas in PT Semen Padang Indarung West Sumatera Province Muhammad Rizki Aulia; Irvani Irvani; Haslen Oktarianty
MINERAL Vol 5 No 1 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

One of the blasting activity impact in Exsisting Pit by PT Semen Padang is producing the ground vibration. Analyzing the blasting distance needed to know the level of ground vibration. From that analysis, the actual value and prediction value of Peak Vector Sum (PVS) and value of vibration by SNI 7571 : 2010. The measuring of ground vibration level is done in Mess APN as residents settlement, wich is located as far as 611 meters from blasting location. The measurement starts by measuring the blasting geometry, the amount of drill hole, blasting distance, and ground vibration for about 13 data. Those data are processed using Shotplus-I to make the blasting design and the ground vibration level will be known by using blastmate. From the 13 data of ground vibration Mess APN that known on the distance 464 m the result of ground vibration is 1.651 mm/s while on the distance 478 the result of ground vibration is 2.382. Based on the result that can be seen there is an anomaly data, that caused the same blasting geometry treatment for rock structure on mine site. Beside, according measurement data wich are measured in Mess APN, the average value of ground vibration is 1.511 mm/s. It show that the ground ground vibration does not cause a significant impact in Mess APN as residents settlement and does not exceed the limit value of class 2 building category by SNI 7571:2010 (limit value is 3 mm/s)

Technical Study of Blasting Geometry and Powder Factor of Fragmentation at Pit 3 Banko Barat PT Bukit Asam Tbk Hermita Ramadhini; Irvani Irvani; Haslen Oktarianty
MINERAL Vol 5 No 1 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

Mining PT Bukit Asam Tbk is one of the company that works in coal mining. One of the demolition activities in PT Bukit Asam Tbk is overburden stripping using drilling method and blasting. The success rate of blasting activity can be seen from the fragmentation as the blasting result, where the material size is equally spread is better than boulder. On Pit 3 Banko Barat, blasting using stemdeck results with uneven fragmentation size in condition of same powder factor and burden. This is caused by different rain intensity. Rainfall is causing blasting hole to be wet and decreasing the blasting capabilities of explosives. Blasting using stemdeck results in fragmentation average of 27.19 cm. Blasting without stemdeck based on same burden 8 m, results in fragmentation average of 46.46 cm and fragmentation size chart is obtained that shows increasing value as the powder factor from blasting geometry. That thing is contradictory with theory that the greater powder factor will result in uneven fragmentation size because it is connected with explosives usage. This condition is caused by the same doing to different rock structure on mining location in making blasting geometry design. Blasting without stemdeck based on same powder factor 0.16 kg/m3, results in fragmentation average of 66.26 cm and fragmentation size chart is obtained that is increasing as the value of burden. Smallest fragmentation value in average of 25.12 cm with 8 m burden and 0.17 kg/m3 powder factor. So if smaller fragmentation is needed in the future, then it is recommended to use smaller burden in making blasting geometry design.

Pengaruh Fragmentasi Terhadap Digging Time Dan Produktivitas Excavator Liebher R9400 Pada Area Peledakan PT Dahana Site Adaro Alex Lisendrik Nadapdap; Guskarnali Guskarnali; Haslen Oktarianty
MINERAL Vol 5 No 2 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

This research examines the effect of fragmentation on the digging time and productivity of the Liebher R9400 excavator at blasting area of PT Dahana site Adaro. The problem in this research is that the excavator productivity is not evenly distributed in each location, because the size of the fragmentation that is different in each location. The method used in this research is to analyze the factors supporting productivity such as digging time, efficiency and actual conditions in the field, and the method of image and obtained an average size of material fragmentation of 55.76 cm with the smallest fragmentation size of 29.15 cm and the largest size of 70.28 cm. the results based on actual obtained different productivity of excavators in research locations. The first productivity is 4,780.07 tons / hour with fragmentation of 53.1 cm, the second is 4,639,585 tons / hour with fragmentation of 62 cm, the third is 4,765,638 tons / hour with fragmentation of 56.14 cm, and the fourth is 4,746,547 tons / hour with 50.7 cm fragmentation. Based on the analysis it was concluded that the greater the size of the fragmentation, the productivity of the Liebher R9400 excavator will decrease and vice versa. However, there are several factors that affect excavator productivity, namely fragmentation quality, work efficiency, swing angle, tool maintenance, operator, swell factor, and digging ressistance.

Master Plan Pit Blok Timur Tambang Batubara Di PT Artamulia Tatapratama Kabupaten Muaro Bungo Provinsi Jambi Benget Harmoko Manik; Guskarnali Guskarnali; Haslen Oktarianty
MINERAL Vol 5 No 2 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Artamulia Tatapratama is a private coal mining company located in Tanjung Belit Village, Jujuhan, Muaro Bungo, Jambi Province. The topic of discussion in this research is the location in the East block has an area of 161 Ha, does not yet have a mining design, therefore a master plan is carried out, provided that the striping ratio of the company is 8 : 1, 10 : 1 and 12 : 1. The method begins with taking strike dip 80 data for landslide analysis and optimal angles with Dips software, followed by testing the safety factor in the Slide software, then processing 60 drill data on Minescape to design pit limits, calculating reserves using the strip block method and solid blokc, then resgraphic determining economical area is mined and designing the pit design. Based on this, there are indications of wedge avalanches, the design angle should not be more than 82o and the pit limit area of 98 Ha with a striping ratio design pit SR 8 area 22 Ha overburden 4.828.436 BCM coal 595.956 tons, pit design SR 10 area 35 Ha overburden 6.997.226 BCM and coal 690.022 tons, design pit SR 12 with an area of 42 Ha 9.702.861 BCM and coal 799.561 tons.

Kajian Teknis Geometri Peledakan Di Pit 2 Banko Barat PT Bukit Asam Tbk, Tanjung Enim, Sumatera Selatan Masyeba Evans Lubis; Irvani Irvani; Haslen Oktarianty
MINERAL Vol 5 No 2 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Bukit Asam Tbk is one of the company that runs in coal mining at South Sumatera. One of the mining activity in PT Bukit Asam Tbk is overburden stripping using blasting method. The purpose of blasting method is to soften the hard outer layer material to ease the process of excavation using drilling and hauling instrument. Analysis of blasting geometry is done in order to get the fragmentation result that appropriate to the capabilities of drilling and hauling instrument. In the location of Pit 2 Banko Barat, blasting using air decking method that is called stemdeck is done to get better fragmentation result and less explosives usage. The research consist of 10 times blasting. The actual geometry rate here as follows 6.46 m burden, 6.40 m space, 6.75 hole depth. According to three data that are chosen in condition of same powder factor result in uneven fragmentation rate. This is caused by different rain intensity. Rainfall is causing blasting hole to be wet and decreasing the blasting capabilities of explosives. Those three explosives result in 18.22 cm of total fragmentation rate. This condition is caused by the same doing to different rock structure on mining location in the making of blasting geometry design. Fragmentation rate chart shows increasing value that follow burden value. Lowest fragmentation rate is 12.46 cm with 6.38 cm burden, 0.18 kg/m3 powder factor. So that if fragmentation needed to be lower than 12.46 cm later, it is recommended to use burden under 6.38 cm when calculating the blasting geometry design.

Kajian Teknis Sistem Jaringan Ventilasi Tambang Ciurug Level 600 PT Aneka Tambang Tbk UBPE Pongkor Leyriesa Awdina; Irvani Irvani; Haslen Oktarianty
MINERAL Vol 5 No 2 (2020): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

According to field observation result the average dry temperature and wet temperature around between 23 – 30 ºC, with relative humidity around 83 - 93 % and contain 20.9 % O2, 4 ppm CO, on the front production there are 2 cross cut XC 636 and XC 644 have high temperature that reach 31 ºC and 100 % relative humidity. The acquired field data contain dry temperature, wet temperature, wet bulb global temperature, air velocity, and tunnel dimension so then effective temperature, work efficiency and work climate threshold value can be calculated. The result calculation get effective temperature is acquired 29 – 30 ºC, work efficiency 79 - 62 %, and climate threshold value with work arrangement as much 0 - 50 %. Technical problem on the field which causes high temperature is air recirculation from dirty air exhaust from XC 636 that is opposite with clean air direction from fan 75 kW, recirculation on access 644 from booster fan 37 kW located before XC 637 which results in increasing dirty air quantity into front production plus the second front with water puddles from drilling front roof droplets. Effort made on access XC 644 that is fan 75 kW replaced with fan 90 kW, and the tip of flexible duct extends after RC 7 so that the airflow doesn’t mix with exhaust from XC 636, aside from that booster fan 37 kW after XC 637 is moved so it help sucking dirty air from front XC 644, it can resolve air recirculation

Perencanaan Sistem Pemompaan pada Penambangan Timah Primer Shaft Lacat 4 Pt Menara Cipta Mulia Kelapa Kampit Belitung Timur Aryuni Yusra Hamid; Delita Ega Andini; Haslen Oktarianty
MINERAL Vol 6 No 1 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

This research was conducted to redesign the pumping system in the air drying process within a maximum of 25 days. The method used is descriptive and quantitative methods with actual data in the form of pressure and suction pipe elevation, pipe length and diameter, catchment area, actual discharge and pump head, location coordinates.The runoff discharge is 1.89 m3 / s, is prevented from entering the mine area by creating a channel with discharge flow of 2.12 m3 / s. The total volume on Shaft Lacat 4 is 34,591.7 m3 . The pump at a depth of 20 m has a discharge of 229.37 m 3 / hour, while a depth of 28 m has a discharge of 210.73 m3 / hour. Assuming the ground water is 200.64 m3 / hour, the addition of one pump with a discharge of 36 m3 / hour so that the drying time for 24 days is 11.8 hours. Production is stacking the sump of 1 x 1 x 1.5 m, making a channel with dimensions of 10 cm x 10 cm.

Evaluasi Sistem Penirisan Tambang di PT Vitrama Properti Desa Air Mesu Kabupaten Bangka Tengah Riztia Ramadhanti; Delita Ega Andini; Haslen Oktarianty
MINERAL Vol 6 No 1 (2021): MINERAL
Publisher : Jurusan Teknik Pertambangan Universitas Bangka Belitung

PT Vitrama Properti applies mine dewatering system by making open channel. The open channel got silting because many solid particles have deposited causing the mine road become flooded. The method used is quantitative method by evaluating and analyzing dewatering system. The data taken is in the form of coordinate data, actual discharge, channel dimensions and the time for sediment deposition on settling pond. Catchment area is 42.4 ha. Based on the calculation of rainfall data and rainfall analysis with the gumbell method, the maximum planned rainfall value is 183.9 mm/day with a rain intensity is 63.75 mm/day, the maximum total discharge is 156,193.92 m3 /day or 1.8078 m3 /day. The surface width of the new channel is 1.7 m, the bottom width is 0.5 m and height is 1 m. The new settling pond dimension have total design volume of 3,292.5 m3 . The time for dredging the sediment material in the settling pond is every one or two years when the sediment material in compartment one has deposited as much as 60% of settling pond volume

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