Perhitungan Sumberdaya Dan Cadangan Di PT Batubara Jambi Lestari Mestong Provinsi Jambi

Aliffano, Yulian and Zahar, Wahyudi and Yulanda, Yudi Arista (2024) Perhitungan Sumberdaya Dan Cadangan Di PT Batubara Jambi Lestari Mestong Provinsi Jambi. S1 thesis, Universitas Jambi.

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Abstract

PT. Batubara Jambi Lestari berencana memakai sistem tambang terbuka dengan menggunakan metode strip mining pada daerah blok utara. Pada daerah blok utara telah dilakukan eksplorasi detail sehingga sangat diperlukan estimasi yang tepat terhadap sumberdaya serta cadangan yang ada didaerah tersebut agar penambangan yang direncanakan tidak mengalami kerugian. Dalam mengestimasi sumberdaya dan cadangan digunakan metode Nearest Neighbour Point (NNP) pada block model dengan bantuan software tambang. Dari data eksplorasi yang berupa data collar, topografi, survey dan lithologi tersebut, dilakukan cross-check antara data collar dengan data topografi. Hal ini dilakukan untuk mengetahui selisih rata-rata elevasi antara titik bor dengan permukaan topografi dengan hasil yakni -0,2%. Pada data lihologi perlu dilakukan validasi melalui trial-error terhadap pemodelan endapan batubara, dimana pada lithologi parting yang ketebalannya kurang dari 10 centimeter akan dikompositkan kedalam lithologi batubara atau overburden. Begitu juga sebaliknya, sehingga diperoleh tiga data lithologi berupa dua data interburden dan satu data parting. Pada blok utara dibuat polygon sumberdaya yang dibatasi oleh IUP sehingga didapatkan hasil yakni hanya sumberdaya terukur dengan radius 250 meter yang berada didalam IUP. Pemodelan endapan dibuat dengan kontur struktur berdasarkan trial-error kearah down dip sampai batas IUP. Sehingga dari sayatan yang dilakukan untuk kedudukan lapisan batubara dengan strike N 135 E° (Tenggara) dan dip rata-rata 12° (Barat Daya) pada geological model searah dengan sayap kiri antiklin yang mengikuti antiklin besar (antiklin pematang jungutingik). Berdasarkan block model report untuk estimasi batubara didapatkan tonase sumberdaya pada blok utara yakni 2.359.525 Ton. Rancangan desain pit dibuat mengikuti striping ratio (SR) atas kebijakan perusahaan dengan parameter yaitu: tinggi bench 5 meter, lebar bench 3 meter dan single slope 55°. Dari parameter tersebut dibuatlah desain pit melalui trial-error menggunakan block model dengan hasil desain pit SR 3,01; 4,02; 5,11. Untuk mendapatkan cadangan batubara pada setiap desain pit perlu dibuat pit dengan batas roof dan pit dengan batas floor. Lalu diestimasi volume batubara pada pit roof dan pit floor sehingga didapatkan volume overburden untuk pit SR 3,10; 4,02; 5,11 secara berturut-turut yakni 1.185.625 Bcm, 2.176.250 Bcm, 3.845.000 Bcm. Untuk desain PIT dengan SR 3,01; 4,02; 5,11 memiliki tonase cadangan batubara berturut-turut sebesar 393.750 Ton, 541.500 Ton, 753.000 Ton. Kata kunci: Batubara, Block Model, Cadangan, Estimasi, NNP, Sumberdaya PT. Batubara Jambi Lestari plans to use an open mining system using the strip mining method in the northern block area. In the northern block area, detailed exploration has been carried out so that an accurate estimate of the resources and reserves in the area is needed so that the planned mining does not suffer losses. In estimating resources and reserves, the Nearest Neighbor Point (NNP) method is used in the block model with the help of mining software. From the exploration data in the form of collar, topography, survey and lithology data, a cross-check was carried out between the collar data and topography data. This was done to determine the difference in average elevation between the drill point and the topographic surface with the result being -0.2%. Lithological data needs to be validated through trial-error modeling of coal deposits, where lithological parts whose thickness is less than 10 centimeters will be composited into coal lithology or overburden. Vice versa, so that three lithological data are obtained in the form of two interburden data and one parting data. In the northern block, a resource polygon is created which is limited by the IUP so that the results obtained are that only measurable resources with a radius of 250 meters are within the IUP. Deposit modeling is made with structural contours based on trial-error towards down dip to the IUP boundary. Deposit modeling is made with structural contours based on trial-error towards down dip to the IUP boundary. So from the incision made to the position of the coal seam with a strike of N 135 E° (Southeast) and an average dip of 12° (Southwest) in the geological model in the direction of the left wing of the anticline which follows the large anticline (jungutingik embankment anticline). Based on the block model report for coal estimation, the resource tonnage in the northern block is 2.359.525 tonnes. The pit design design was made following the striping ratio (SR) according to company policy with parameters namely: bench height 5 meters, bench width 3 meters and single slope 55°. From these parameters, a pit design was made through trial and error using a block model with a pit design result of SR 3,01; 4,02; 5,11. To obtain coal reserves in each pit design, it is necessary to make a pit with a roof boundary and a pit with a floor boundary. Then the coal volume on the pit roof and pit floor is estimated so that the overburden volume for the pit SR is 3.10; 4.02; 5.11 respectively, namely 1.185.625 Bcm, 2.176.250 Bcm, 3.845.000 Bcm. For PIT design with SR 3,01; 4,02; 5,11 has coal reserve tonnage of 393.750 tons, 541.500 tons, 753.000 tons respectively. Key words: Block Model, Coal, Estimation, NNP, Reserves, Resources

Type:	Thesis (S1)
Uncontrolled Keywords:	Batubara, Block Model, Cadangan, Estimasi, NNP, Sumberdaya
Subjects:	L Education > L Education (General)
Divisions:	Fakultas Sains dan Teknologi > Teknik Pertambangan
Depositing User:	ALIFFANO
Date Deposited:	26 Jun 2024 04:11
Last Modified:	26 Jun 2024 04:12
URI:	https://repository.unja.ac.id/id/eprint/65668

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