RANCANGAN PUSHBACK PENAMBANGAN BATUBARA PT. UNITED COAL INDONESIA SITE TAMIANG DI DESA GANDRUNG, KECAMATAN PAKU, KABUPATEN BARITO TIMUR, PROVINSI KALIMANTAN TENGAH

RINGKASAN PT. United Coal Indonesia memiliki cadangan batubara tertambang sebanyak 1.265.176 Ton akan melakukan penambangan batubara di lokasi Izin Usaha Pertambangan yang terletak di Desa Gandrung, Kecamatan Paku, Kabupaten Barito Timur, Provinsi Kalimantan Tengah. Untuk saat ini belum memiliki rancangan penambangan yang terencana dan terarah sehingga membutuhkan rancangan penambangan untuk memenuhi target produksi sebanyak 300.000 Ton/Tahun. Rancangan pushback penambangan di fokuskan pada blok prioritas 2 – 4, untuk geometri jenjang yang akan digunakan dalam perancangan sesuai rekomendasi dari geotech departement yaitu untuk tinggi jenjang tunggal 10m, lebar jenjang 3m, kemiringan jenjang tunggal 55º dan kemiringan jenjang keseluruhan 41º dengan Stripping Ratio rata – rata 18 : 1. Dari jumlah cadangan yang ada dan target produksi yang ada diperkirakan umur tambangnya ± 4 Tahun Arah penambangan dimulai dari section 10 sampai 36 dikarenakan section 01 sampai 09 sudah dilakukan penambangan. Penambangan Tahun I dilakukan dari section 10 sampai 18 pada elevasi 130 dan berakhir pada elevasi 20 mdpl, diperkirakan volume top soil dan overburden sebanyak 6.027.332 BCM dan batubara yang akan tergali sebanyak 320.216 Ton dengan stripping ratio 19 : 1. Penambangan Tahun II dilakukan dari section 18 sampai 23 pada elevasi 140 dan berakhir pada elevasi 20 mdpl, diperkirakan volume top soil dan overburden sebanyak 6.236.571 BCM dan batubara yang akan tergali sebanyak 311.237 Ton dengan stripping ratio 20 : 1. Penambangan Tahun III dilakukan dari section 23 sampai 29 pada elevasi 130 dan berakhir pada elevasi 40 mdpl, diperkirakan volume top soil dan overburden sebanyak 5.289.835 BCM dan batubara yang akan tergali sebanyak 320.066 Ton dengan stripping ratio 17 : 1. Penambangan Tahun IV dilakukan dari section 29 sampai 36 pada elevasi 120 dan berakhir pada elevasi 20 mdpl, diperkirakan volume top soil dan overburden sebanyak 4.816.553 BCM dan batubara yang akan tergali sebanyak 313.655 Ton dengan stripping ratio 15 : 1. Untuk penimbunan overburden dengan cara outside dump dan backfilling, Hasil penggalian dari Pit_1 dilakukan dengan cara outside dump yang akan dibuang ke waste dump_1 dengan volume penimbunan sebanyak 2.697.280 CCM dan di lanjutkan ke waste dump_2 dengan volume penimbunan sebanyak 1.022.034 CCM. Kemudian hasil penggalian dari Pit_2 akan di backfilling ke waste dump_3 dengan volume penimbunan sebanyak 6.859.940 CCM. Hasil penggalian dari Pit_3 akan di backfilling ke waste dump_4 dengan volume penimbunan sebanyak 5.094.275 CCM. Hasil penggalian Pit_4 akan di backfilling ke waste dump_5 dengan volume penimbunan sebanyak 12.211.289 CCM. ABSTRAC PT. United Coal Indonesia has mineable coal reserves will do as much as 1.265.176 Tons of coal mining in the Mining Permit site is located in the village of Gandrung, District Nails, East Barito regency, Central Kalimantan Province. Currently do not have a mining plan that requires a planned and directed the design of mining to meet the production target of 300.000 ton / year. The design of pushback mining has focused on the block priority 2-4, for the geometry level to be used in the design according to the recommendations of the Geotech department is to high levels of single slope-10m, the width of ladder 3m, the slope of the level of a single 55º and the slope of the level of 41º with a stripping ratio of mean - average 18 : 1. Of the amount of existing reserves and production targets are estimated to ± 4 year mine life. Mining direction starting from the section 10 to 36 because of section 01 to 09 already done mine. Mining in year I was conducted from section 10 to 18 at an elevation of 130 and ends at an elevation of 20 meters above sea level, estimated volume of top soil and overburden 6.027.332 BCM and coal to be mined as much as 320.216 tons with stripping ratio of 19 : 1. Mining In year II was conducted from section 18 to 23 at an elevation of 140 and ends at an elevation of 20 meters above sea level, estimated volume of top soil and overburden 6.236.571 BCM and coal to be mined by stripping as much as 311.237 Ton with stripping ratio of 20 : 1. Mining In year III was conducted from section 23 to 29 at an elevation of 130 and ends at an elevation of 40 meters above sea level, estimated volume of top soil and overburden total of 5.289.835 BCM and coal to be mined by stripping as much as 320.066 Ton ratio 17 : 1. Mining In year IV was conducted from section 29 to 36 at an elevation of 120 and ends at an elevation of 20 meters above sea level, estimated volume of top soil and overburden 4.816.553 BCM and coal to be mined by stripping as much as 313.655 Ton ratio 15 : 1. For stockpiling overburden dump and way outside backfilling, trenching results from Pit_1 done in a way outside the dump to be disposed of to landfill waste volume as much dump_1 with 2.697.280 CCM and proceed to the volume of landfill waste by as much dump_2 1.022.034 CCM. The results of the excavation Pit_2 will in backfilling to the waste dump_3 with volume of landfill waste by as much 6.859.940 CCM. The results of the excavation Pit_3 will be backfilling to the waste dump_4 with volume of landfill waste by as much 5.094.275 CCM. The results of the excavation Pit_4 will be backfilling to the waste dump_5 with volume of landfill waste by as much 12.211.289 CCM