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All Journal Journal of Earth and Marine Technology (JEMT) INTAN Jurnal Penelitian Tambang Jurnal Teknologi Sumberdaya Mineral
Utari Retno Sulistyo Rini
Program Studi Teknik Pertambangan, Fakultas Teknik, Universitas Jember
Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Physics Transportation

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Determination Coal Mine Ultimate Pit Limit based on Kepmen ESDM No. 227.K/MB.01/MEM.B/2023 and PP 26 2022 Suparno, Fanteri Aji Dharma; Aminah, Siti; Haeruddin, Haeruddin; Lestari, Rina; Mulyani, Kurnia Dewi; Manek, Emanuel; Sulistyo Rini, Utari Retno
Journal of Earth and Marine Technology (JEMT) Vol 5, No 2 (2025)
Publisher : Lembaga Penelititan dan Pengabdian kepada Masyarakat - Institut Teknologi Adhi Tama Suraba

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jemt.2025.v5i2.7236

Abstract

Economic factors and variables from geological resource models affect ultimate pit limit (UPL). Coal selling price, overburden stripping cost, coal mining cost, and royalties are among the economic factors taken into account in UPL. PP 26 2022 and Kepmen 227.K/MB.01/MEM.B/2023 both control the benchmark coal selling price and royalties. It takes a lot of time to determine UPL utilizing the Lerchs Grossman (LG) algorithm. UPL optimization is now feasible by integrating mining modelling software's Structured Query Language (SQL). The goal of this study is to determine UPL by maximizing coal resources at the site using the help of SQL in LG algorithm, which can optimize pits efficiently, precisely, and economically while taking the most recent laws into account. The study investigates a coal mine in Sanga-sanga, East Kalimantan. The study entails examining data processing using secondary data that was gathered for the study. Using the break-even stripping ratio (BESR) analysis approach, mining limitations are chosen. The chosen incremental stripping ratio (ISR) of 12.88 is in close proximity to the $13.41/ton break-even stripping ratio (BESR). The grid OPT015 in the optimization grid contains the incremental stripping ratio (ISR) value and considered as the UPL for the coal mine.
GLOBAL GOLD PRICE VOLATILITY AND ITS CORRELATION TO RESOURCE AND RESERVE DYNAMICS AT PT MERDEKA COPPER GOLD TBK Utari Retno Sulistyo Rini; Fanteri Aji Dharma Suparno; Siti Aminah; Haeruddin
INTAN Jurnal Penelitian Tambang Vol. 8 No. 2 (2025): INTAN: Jurnal Penelitian Tambang
Publisher : Program Studi S1 Teknik Pertambangan Fakultas Teknik Pertambangan dan Perminyakan Universitas Papua

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56139/intan.v8i2.346

Abstract

Gold (Au) commonly occurs as nuggets or grains in rock veins and alluvial deposits. Because of its scarcity, chemical stability, and distinctive properties, gold commands higher market prices than base metals. Global gold price volatility has a significant impact on the strategic decisions of mining companies. This study aims to quantify the correlation between international gold price fluctuations and the dynamics of gold resources and reserves at PT Merdeka Copper Gold Tbk. Using a quantitative approach, the average gold prices and the company's annually reported resource and reserve figures were analyzed. The Pearson correlation coefficient was employed to measure the strength and direction of the relationship. The results reveal a robust and statistically significant negative correlation. This inverse relationship suggests that periods of high price volatility are associated with a decrease in the company's reported gold resources and reserves. The findings highlight the significant impact of external market dynamics on resource management. It is recommended that stakeholders incorporate market volatility forecasts into long-term strategic planning and resource valuation models to enhance resilience.
Analisis Lebar Jalan Tambang Terhadap Produktivitas Hydraulic Shovel Liebherr R996 & Dump Truck Hitachi EH4500 di PT XYZ Rini, Utari Retno Sulistyo; Manek, Emanuel G.; Mulyani, Kurnia Dewi; Aminah, Siti
Jurnal Teknologi Sumberdaya Mineral Vol. 5 No. 2 (2024)
Publisher : Program Studi Teknik Pertambangan Fakultas Teknik Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/jeneral.v5i2.53372

Abstract

PT XYZ adalah perusahaan yang bergerak di bidang pertambangan batubara yang menerapkan sistem penambangan terbuka. Pengupasan lapisan tanah penutup batubara di Pit X PT XYZ dilakukan dengan alat muat hydraulic shovel Liebherr R996 sebanyak satu unit dan alat angkut dump truck Hitachi EH4500 sebanyak enam unit. Target pengupasan tanah penutup di Pit X adalah sebesar 2.100 BCM/jam. Saat ini produktivitas hydraulic shovel Liebherr R996 sebesar 1.970,385 BCM/jam dan untuk dump truck Hitachi EH4500 sebesar 1.450,77 BCM/jam. Saat ini target produktivitas belum tercapai karena adanya beberapa faktor di PT XYZ dan yang akan menjadi fokus penelitian ini pada faktor jalan angkut yang kurang lebar di beberapa titik. Upaya pencapaian produktivitas dapat dilakukan dengan cara pelebaran jalan angkut. Dari pengamatan lapangan waktu edar dump truck adalah 23,30 menit. Dengan simulasi perhitungan, pelebaran jalan dapat mengurangi waktu edar dump truck menjadi 21,30 menit dan produktivitas dump truck meningkat menjadi 1.703,03 BCM/jam. Namun, alternatif ini perlu digabungkan dengan beberapa alternatif tambahan dalam mencapai target yang signifikan di PT XYZ seperti meningkatkan nilai bucket factor shovel, peningkatan efisiensi kerja dan penambahan alat angkut. Sehingga pada akhirnya diharapkan adanya kelanjutan kajian terkait alternatif-alternatif tambahan tersebut sehingga PT XYZ dapat mencapai target yang diharapkan secara signifikan.
Co-Authors Emanuel G. Manek Fanteri Aji Dharma Suparno Haeruddin Haeruddin Kurnia Dewi Mulyani Manek, Emanuel G. Rina Lestari SITI AMINAH Siti Aminah