Kajian Perancangan dan Pentahapan Penambangan Batubara Jangka Pendek PT Baraya Inti Bumi Kecamatan Anggana, Kabupaten Kutai Kartanegara, Provinsi Kalimantan Timur

Abstract

Abstract. PT Baraya Inti Bumi is one of the private companies engaged in mining. Area of Mining Business Permit covering an area of 100 Ha. Seam A coal resources amounted to 476,318.07 tons and seam B was 457,562.93 tons, while measured coal seam A resources were 361,064.85 tons and seam B was 346,847.83 tons. The total amount of coal designated resources at the study site amounted to 933,881 tons and measured cost of 707,912.67 tons. The total reserves proved to be 707,912.67 tons of coal. The proven total reserve is an accumulation of seam A and seam B. The production plan in the first semester was 384,000 tons of coal and 2,280,000 bcm of overburden while the second semester was 323,912.67 tons of coal and 1,941,666.5 bcm of overburden. The value of BESR2 obtained is 11.26: 1 and the economic stripping ratio is 6.75: 1.The design parameters of the mine slope openings are overall recommended pit slope based on the results of slope stability analysis, which is overall height of 60 meters and overall slope 37o. The minimum width of the haul road is 9 meters while the minimum haul road width at the bend is 13,915 meters. The mining system is divided into two mining stages, namely the first semester for seam A mining and second semester for seam B mining. Mining phases carried out in the research area refer to the production plan.

Keywords: Reserves, Design parameters.

 

Abstrak. PT Baraya Inti Bumi merupakan salah satu perusahaan swasta yang bergerak di bidang pertambangan. Wilayah Izin Usaha Pertambangan seluas 100 Ha. Sumberdaya batubara terunjuk seam A sebesar 476.318,07 ton dan seam B sebesar 457.562,93 ton, sedangkan sumberdaya batubara terukur seam A sebesar 361.064,85 ton dan seam B sebesar 346.847,83 ton. Jumlah total sumberdaya terunjuk batubara di lokasi penelitian sebesar 933.881 ton dan sumbedaya terukur sebesar 707.912,67 ton. Total cadangan tebukti didapat 707.912,67 ton batubara. Total cadangan terbukti tersebut merupakan akumulasi dari seam A dan seam B. Rencana produksi pada semester I yaitu 384.000 ton batubara dan 2.280.000 bcm overburden sedangkan semester II yaitu 323.912,67 ton batubara dan 1.941.666,5 bcm overburden. Nilai BESR₂ yang didapat sebesar 11,26 : 1 dan nisbah pengupasan (stripping ratio) ekonomis sebesar 6,75 : 1. Parameter desain bukaan lereng tambang overall pit slope yang direkomendasikan berdasarkan hasil analisa kemantapan lereng yaitu tinggi overall 60 meter dan kemiringan overall 37^o. Lebar jalan angkut minimum sebesar 9 meter sedangkan lebar jalan angkut minimum pada tikungan sebesar 13,915 meter. Sistem penambangan dibagi menjadi dua tahapan penambangan, yaitu semester I untuk penambangan seam A dan semester II untuk penambangan seam B. Pentahapan penambangan yang dilakukan di daerah penelitian mengacu kepada rencana produksi.

Kata Kunci : Cadangan, Parameter desain.