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Abstract. PT Saptaindra Sejati is a contractor service company in the mining sector, especially in the coal exploitation sector. At the end of 2019, this company has carried out mining operations in the PKP2B area of Kajian Sisa Umur Pakai Dan Proteksi Katodik Sistem Anoda Korban Pada Pipa Transportasi Gas Pipeline C Di Kecamatan Cilamaya Wetan, Kabupaten Karawang, Provinsi Jawa Barat Metcoal CompaniesMurung Raya (AMC) located indistrict, starting from planning mining activities until the mining process was carried out. Beginning in 2020, PT Adaro Metcoal Companies (AMC) will carry out its first production activities, so that the mining activity process can be carried out immediately, it is necessary to have detailed planning in the design design and mining phasing. The design of the pit on the mining block is made based on the calculation of the coal resources to be mined, then the measured coal resources are 5,992,406.58 tonnes. Parameters that must be considered in designing a mining design include slope geometry, mining boundaries, mine access road design, and Stripping Ratio. The geometry of the slopes is obtained from the recommendation of geotechnical studies conducted by the company. The design of the mine access road is obtained from the results of calculations that have been carried out both in straight and curved road conditions, the value of 25 m is obtained on the straight road, while for the results on the bend road the value is 28 m. The Stripping Ratio value in this study was obtained 1,54: 1. The design results show that the total reserve is Overburden mined 4.135.853,70 BCM and the mined coal value is 2.683.641,56 tons with a SR value of 1,54: 1. The production target resulting from the results of each mining block in each period is 181.694,74 tons in the first month, 192.490,41 tons in the second month, 200.898,63 tons in the third month, 202.551,46 tons in the fourth month, 203.919,44 tons in the fifth month, 257.102,05 tons in the sixth month, 301.179,34 tons in the seventh month, 301.071,53 tons in the eighth month, 265.822,76 tons in the ninth month, 254.196,68 tons in the tenth month, 145.328,76 tons in the eleventh month, 177.385,77 Tons in the twelfth month. Supervision activities on production operations need to be carried out so that predetermined targets can be achieved in accordance with the plans that have been made.Keywords: Design Pit, Stripping Ratio, Sequencing.Abstrak. PT Saptaindra Sejati merupakan sebuah perusahaan jasa kontraktor di bidang penambangan khususnya pada bagian eksploitasi batubara. Akhir tahun 2019, perusahaan ini telah melakukan kegiatan operasi penambangan di wilayah PKP2B PT Adaro Metcoal Companies (AMC) yang terletak di kabupaten murung raya, dimulai dari merencanakan kegiatan penambangan hingga proses penambangan itu dilakukan. Awal tahun 2020, PT Adaro Metcoal Companies (AMC) akan melakukan kegiatan produksi pertamanya, agar proses kegiatan penambangan dapat segera dilakukan, maka perlu adanya perencanaan secara rinci pada perancangan desain dan pentahapan penambangannya. Perancangan Pit pada blok penambangan dibuat berdasarkan hasil perhitungan sumberdaya batubara yang akan ditambang, lalu didapatkan sumber daya batubara terukur sebesar 5.992.406,58 ton. Parameter yang harus diperhatikan dalam merancang suatu desain penambangan diantaranya geometri lereng, batas penambangan, rancangan jalan akses tambang, dan Stripping Ratio. Geometri lereng didapatkan dari hasil rekomendasi kajian geoteknik yang dilakukan oleh perusahaan. Rancangan jalan akses tambang diperoleh dari hasil perhitungan yang telah dilakukan baik itu dalam kondisi jalan lurus maupun jalan pada tikungan diperoleh nilai 25 m pada jalan lurus, sedangkan untuk hasil pada jalan tikungan diperoleh nilai 28 m. Nilai Stripping Ratio pada penelitian ini didapatkan 1,54:1. Hasil desain didapatkan nilai cadangan total Overburden tertambang sebesar 4.135.853,70 BCM dan nilai batubara tertambang sebesar 2.683.641,56 Ton dengan nilai SR 1,54:1.Target produksi yang dihasilkan dari hasil tiap blok penambangan pada setiap periodenya yaitu pada bulan pertama sebesar 181.694,74 Ton, bulan dua sebesar 192.490,41 Ton, bulan tiga sebesar 200.898,63 Ton, Bulan empat sebesar 202.551,46 Ton, bulan lima sebesar 203.919,44 Ton, bulan enam 257.102,05 Ton, bulan tujuh 301.179,34 Ton, bulan delapan 301.071,53 Ton, bulan sembilan 265.822,76 Ton, Bulan sepuluh 254.196,68 Ton, bulan sebelas 145.328,76 Ton, bulan dua belas 177.385,77 Ton. Kegiatan pengawasan terhadap operasi produksi perlu dilakukan agar target yang telah ditentukan dapat tercapai sesuai dengan rencana yang telah dibuat.Kata Kunci: Efisiensi kerja, Produktivitas, Produksi. |
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