OPTIMASI TAMBANG BIJIH NIKEL STUDI KASUS DI PIT C BLOK KEUNO PT. DJAVA BERKAH MINERAL SITE PROJECT PT. BUKIT MAKMUR ISTINDO NIKELTAMA KECAMATAN PETASIA TIMUR, KABUPATEN MOROWALI UTARA, PROVINSI SULAWESI TENGAH

ASDADHINATA, STEFANUS (2022) OPTIMASI TAMBANG BIJIH NIKEL STUDI KASUS DI PIT C BLOK KEUNO PT. DJAVA BERKAH MINERAL SITE PROJECT PT. BUKIT MAKMUR ISTINDO NIKELTAMA KECAMATAN PETASIA TIMUR, KABUPATEN MOROWALI UTARA, PROVINSI SULAWESI TENGAH. Other thesis, UPN 'Veteran" Yogyakarta.

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Abstract

iv
RINGKASAN
PT. Djava Berkah Mineral (PT. DBM) merupakan perusahaan yang bergerak
di bidang kontraktor pertambangan dengan komoditas utama Nikel laterit yang
terletak di Kecamatan Petasia Timur, Kabupaten Morowali Utara, Provinsi
Sulawesi Tengah. Jobsite penelitian ini milik PT. Bukit Makmur Istindo Nikeltama
dengan luas IUP 4778 Ha. Pada pertengahan tahun 2021 PT. DBM dan PT.
Bumanik akan memulai penambangan dengan rata-rata target produksi 60.000
ton/bulan selama 7 bulan di Pit C Blok Keuno, sehingga dibutuhkan optimasi
tambang terbuka dan perencanaan tambang untuk mencapai target produksi yang
ditentukan oleh perusahaan.
Tujuan penelitian ini adalah melakukan optimasi tambang terbuka sehingga
diperoleh rekomendasi pit shell. Pit shell optimal digunakan sebagai acuan rencana
dan rancangan penambangan. Setelah melakukan optimasi lalu membandingkan
rencana penambangan sebelum dan sesudah optimasi. Kemajuan penambangan
dibuat selama 7 bulan dengan target produksi 60.000 ton/bulan.
Metode optimasi yang digunakan dalam penelitian ini yaitu Lerch-Grosmann.
Algoritma Lerch-Grossman diciptakan oleh Lerch dan Grossman pada tahun 1965.
Algoritma ini digunakan untuk mengoptimasi lubang bukaan tambang berdasarkan
pendekatan matematis metode numerik. Ada dua macam algoritma yang
dikembangkan, yaitu algoritma pemrograman dinamis sederhana untuk lubang
bukaan tambang dua dimensi (satu bagian vertikal tambang) dan algoritma grafik
yang lebih rumit untuk lubang bukaan tambang tiga dimensi.
Pitshell 3 merupakan pitshell optimal dengan NPV $2.097.865, IRR (Internal
Rate Return) 49%. Rancangan penambangan dari acuan pit shell ketiga
menghasilkan nilai NPV sebesar $2.016.865, IRR 47%, dan PBP (Pay Back
Period) 4 bulan. Hasil cadangan berdasarkan rancangan penambangan didapatkan
bijih Nikel sebesar 439.000 ton dan batuan sisa sebesar 829.000 ton dengan
stripping ratio 1,89 yang akan dibagi menjadi 7 bulan. Alat muat yang digunakan
pada pengupasan lapisan tanah penutup adalah Excavator Komatsu PC300 dan alat
angkut Mercedez Benz Axor 2528C sedangkan pengupasan bijih Nikel
menggunakan alat muat Excavator Komatsu PC 300 dan alat angkut UD QUESTER
CWE 370. Hasil rencana penambangan sebelum optimasi tambang terbuka NPV
$1.423.998, IRR 43%, dan PBP 4 bulan.
Berdasarkan analisis pit shell yang dipilih adalah skema specified case
dengan parameter NPV tertinggi. Pit shell 3 yang paling optimal menjadi acuan
dalam rancangan penambangan. Berdasarkan hasil di atas, membuktikan bahwa
proses optimasi menghasilkan nilai keuntungan yang lebih besar. Proses optimasi
perlu dilakukan sebelum perencanaan dan perancangan penambangan untuk
memperoleh keuntungan yang optimal.
v
SUMMARY
PT. Djava Berkah Mineral (PT. DBM) is a mining contractor company with
the main commodity of Nickel laterite, which is located in East Petasia District,
North Morowali Regency, Central Sulawesi Province. This research jobsite was
owned by PT. Bukit Makmur Istindo Nickeltama with an IUP area of 4778 Ha. In
mid-2021 PT. DBM and PT. Bumanik has started mining with an average
production target of 60.000 tons/month for 7 months at Pit C Keuno Block, as of
open pit optimization and mine planning was required an open pit optimization and
mine planning to achieve the production target set by the company.
Optimizing open pit mines was the purpose of this research so the pit shell
recommendations were obtained. The optimal pit shell were used as a reference for
mining plans and designs. After doing the optimization and then comparing the
mining plan before and after optimization. Mining progress was made for 7 months
with a production target of 60.000 tons/month.
Lerch-Grossman was an optimization method used in this research. The
Lerch-Grossman algorithm was created by Lerch and Grossmann in 1965. This
algorithm was used to optimize mine pits based on a mathematical approach to
numerical methods. There were two kinds of algorithms developed, videlicet a
simple dynamic programming algorithm for a two-dimensional mine opening (one
vertical part of the mine) and a more complex graphic algorithm for a three�dimensional mine opening.
Pit shell 3 was the optimal pit shell with NPV (Net Present Value) $2.097.865,
IRR (Internal Rate Return) 49%. The NPV value of $2.016.865, IRR 47%, and PBP
(Pay Back Period) 4 months was generated by the mining design of the third pit
shell reference. The results of the reserves was based on the mining design obtained
Nickel ore of 439.000 tons and waste rock of 829.000 tons with a stripping ratio of
1,89 which were divided into 7 months. The Komatsu PC300 Excavator and the
Mercedez Benz Axor 2528C haul truck were used as the loading equipment for
overburden removal, while the Komatsu PC 300 excavator and the UD QUESTER
CWE 370 haul truck were used for stripping Nickel ore. NPV $1,423,998, IRR 43%
and PBP 4 months were the result of mining plan prior to optimization of open pit
mine.
The specified case scheme with the highest NPV parameter was the scheme
that has been selected based on pit shell analysis. Pit shell 3 has became the most
optimal reference in mining design. Based on the results above, it has proved, that
a greater profit value has been generated by the optimization process. In order to
obtain optimal profit, optimization process was required prior to mining planning
and design.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	rencana penambangan sebelum dan sesudah optimasi.
Subjects:	T Technology > T Technology (General)
Divisions:	Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User:	Eko Yuli
Date Deposited:	01 Jul 2022 02:45
Last Modified:	01 Jul 2022 07:47
URI:	http://eprints.upnyk.ac.id/id/eprint/30205

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