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M. Puspita
Universitas Sriwijaya
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Social Sciences Other

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ANALISIS PANJANG KOLOM AIR DECK TERHADAP FRAGMENTASI HASIL PELEDAKAN DI PIT 2 BANGKO BARAT PT BUKIT ASAM TBK. M. Asof; K. Dino; M. Puspita
Jurnal Pertambangan Vol. 7 No. 1 (2023): Februari 2023
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v7i1.1602

Abstract

PT Bukit Asam, Tbk merupakan perusahaan pertambangan batubara, berlokasi di Tanjung Enim, Sumatera Selatan. Salah satu lokasi tambangnya Bangko barat, pengupasan tanah penutupnya menggunakan metode pengeboran dan peledakan, hal ini mengakibatkan keseragaman fragmentasi hasil peledakan berpotensi kurang seragam. Hal ini berpotensi menurunkan optimalnya volume pengisian bucket. Air decking merupakan penyelesaian yang bisa digunakan, dimana air decking menciptakan ruang kosong dalam kolom ledak yang nantinya berfungsi untuk memperpanjang energi hasil peledakan dengan menahan energi ledakan vertikal ke dalam ruang kosong dan didistribusikan kembali secara merata ke sekitar lubang. Pendistribusian energi tersebut menghasilkan hasil fragmentasi yang lebih merata. Tujuan penelitian ini yaitu mengkaji aplikasi Bottom Air Deck pada Peledakan Overburden di PT Bukit Asam, Tbk, Tanjung Enim Sumatera Selatan. Peledakan air deck menggunakan geometri burden 7 m, spasi 8 m, kedalaman lubang ledak 7 m, banyak lubang 47 lubang, stemming 4,1 m, air deck 0,5 m, dan PC 2,4 m. Hasil peledakan dengan konfigurasi ini menghasilkan rata – rata 62,05% fragmentasi yang lolos pada target ayakan 120 cm yang diinginkan perusahaan. Panjang kolom air deck divariasikan menjadi 0,6 m – 1,0 m untuk mendapat hasil lebih baik, sedangkan faktor lainnya dibiarkan tetap sama dengan geometri peledakan awal. Dimana dengan perubahan panjang kolom air deck menjadi 0,9 m menhasilkan persentase hasil paling optimum pada ayakan 120 cm sebesar 96,82%.
OPTIMALISASI CADANGAN BATUBARA SEAM P PADA DESAIN PIT PQRT PT BERAU COAL H. Nashita; E. Ibrahim; M. Puspita
Jurnal Pertambangan Vol. 7 No. 3 (2023): Agustus 2023
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v7i3.1677

Abstract

Pit PQRT merupakan salah satu pit yang berada di Site Lati yang menjadi penyumbang terbesar dalam produksi batubara PT Berau Coal pada tahun 2022, yaitu mencapai 7.951.581 ton. Permintaaan pasar terhadap batubara seam P juga meningkat seiring dengan peningkatan konsumsi batubara dunia. Pada kondisi aktual pit PQRT terdapat di sisi barat high wall pada elevasi -70 berpotensi untuk dilakukan optimalisasi batubara. Oleh karena itu diperlukan perencanaan kembali desain pit PQRT untuk mengoptimalkan volume cadangan batubara seam P, menghitung volume overburden dan batubara seam P sebelum dan setelah dilakukan optimalisasi serta nilai break even stripping ratio (BESR) dan stripping ratio (SR) ekonomis apabila dilakukan optimalisasi batubara. Perancangan desain optimalisasi batubara seam P pit PQRT dilakukan menggunakan software MineScape 5.7. Berdasarkan rekomendasi geoteknik PT Berau Coal direncanakan single slope 55o, overall slope 32o, tinggi lereng tunggal 10 meter, lebar jenjang 5 meter, dan lebar jalan angkut 35 meter. Desain pit optimalisasi menghasilkan request level (RL) tertinggi 80 dan RL terendah -90 dengan faktor keamanan (FK) 1,24 untuk overall slope dan FK 1,21 untuk single slope. Hasil perhitungan total cadangan untuk area optimalisasi batubara seam P pit PQRT sebesar 114.637 ton untuk batubara dan sebesar 527.039 BCM untuk overburden maka total cadangan pit PQRT tahun 2023 apabila ditambahkan dengan volume cadangan optimalisasi sebesar 8.066.218 ton batubara dan 124.841.039 BCM overburden. Nilai BESR dan SR Ekonomis untuk penambahan volume batubara dan overburden pada desain pit optimalisasi sebesar 47,8 dan 33,46.
RANCANGAN PENAMBANGAN DENGAN PENANGANAN MATERIAL OPD ABC TIMUR DI PIT MIDDLE PT BANJARSARI PRIBUMI T. Marbun; Bochori .; M. Puspita
Jurnal Pertambangan Vol. 8 No. 1 (2024): Februari 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i1.1697

Abstract

PT Banjarsari Pribumi merencanakan target produksi satu juta ton batubara dari pit middle pada tahun 2023, sehingga diperlukan suatu perencanaan penambangan yang dapat menunjang pencapaian produksi. Penelitian bertujuan untuk merencanakan penambangan yang mencakup desain pit dan disposal, sequence penambangan bulanan dengan penanganan matrial OPD ABC timur dan analisis keperluan alat gali muat dan angkut. Perancangan pit penambangan, disposal dan sequence bulanan dibuat menggunakan bantuan software minescape 5.7 dengan cara dilakukan penentuan blok penambangan dengan uji coba secara berulang serta batasan nilai stripping ratio 6,2 dan target produksi bulanan yang ditetapkan. Berdasarkan hasil rancangan pit diperoleh perhitungan volume 1.014.675 ton batubara dan 5.821.600 BCM overburden dengan stripping ratio 5,74. Rancangan pit dibuat dengan memperhitungkan pengambilan kembali material OPD ABC timur yang berada di pit middle dan rancangan sekuen penambangan dijadwalkan bulanan yang dapat memenuhi pencapaian produksi batubara sebanyak satu juta ton. Arah penambangan dimulai dari side wall timur melanjutkan penambangan sebelumnya menuju side wall barat dengan luas bukaan 39,18 Ha. Rancangan penimbunan disposal dibuat secara inpit dump pada area IPD ABC seluas 44,30 Ha yang dapat menampung overburden sebesar 7,99 juta BCM.
SELECTION OF CREATIVE ECONOMIC MSMEs FOR MINING COMMUNITIES IN LAHAT REGENCY USING ANALYTICAL HIERARCHY PROCESS M. Puspita; Bochori Bochori; M. M. Ibrahim; I. D. A. Purbasari; M. D. Almentirado
Jurnal Pertambangan Vol. 8 No. 4 (2024): November 2024
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jp.v8i4.2906

Abstract

The sustainability of the mining industry is highly dependent on the availability of natural reserves of minerals. The conversion of land that was originally intended as a forest or garden into a mining area has caused people around the mine to change professions. However, professions or businesses that arise as a result of mining activities can only last as long as the mine is still operating. Then a big question mark arises regarding the sustainability of the community's economy after mining. With limited resources, MSMEs (micro, small and medium enterprises) based on the creative economy are one of the businesses that can be applied to empower post-mining communities. This study aims to determine the ranking of alternative creative economy MSMEs that can be developed in communities around the mine in Lahat Regency. The method used is the analytical hierarchy process (AHP). This study was conducted by determining the criteria for creative economy MSME businesses and alternatives and then continued with collecting primary data for paired comparisons using a questionnaire. Furthermore, data processing was carried out to determine alternative rankings and consistency ratio testing. The results of the study showed that the highest ranking of alternative creative economy MSMEs was the snack food culinary subsector, followed by the woven craft subsector, the textile craft subsector, and the traditional beverage culinary subsector in sequence.
THE IMPACT OF CHANGES IN ROYALTY RATES ON COMPANY PROFITABILITY: A CASE STUDY OF PT BUKIT ASAM TBK M. Puspita; R. M. Arafiq; A. P. Gobel; E. Oktarinasari; R. Amalia
Jurnal Pertambangan Vol. 9 No. 1 (2025): Februari 2025
Publisher : Fakultas Teknik Universitas Sriwijaya

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Abstract

In recent years, the Indonesian government has twice amended the regulations regarding coal royalty rates, namely in 2019 and 2022. Based on Government Regulation No. 81 of 2019, coal royalty rates range from 3-7% (open pit) and 2-6% (underground), depending on the calorific value. Following the implementation of Government Regulation No. 26 of 2022, coal royalty rates have undergone significant changes, ranging from 5% to 13.5% depending on the calorific value and the government-set reference coal price. This new policy is deemed risky for reducing profitability due to the increased amount of royalties that must be paid. This study aims to calculate the increase in royalty costs and assess the financial performance of companies in adapting to the policy using the net profit margin (NPM). The results show that in the fourth quarter of 2022, there was a 107.63% increase in royalty costs. However, this increase in royalties did not cause the companies' profitability to decline. The NPM percentage tended to increase during the period from 2020 to 2022, reaching 13.9%, 27.5%, and 30%, respectively. This was partly due to an increase in sales volume and improved coal prices in 2022. Thus, it can be concluded that the increase in sales volume and coal prices during this period had a positive impact in offsetting the rise in royalty rates caused by the implementation of Government Regulation No. 26 of 2022. As a result, PT Bukit Asam, Tbk's NPM continued to show a positive trend during this period.
PERFORMANCE AND OPERATIONAL COSTS OF STRIPPING OVERBURDEN AT PT BUMI SEKUNDANG ENIM ENERGY M. Puspita; S. Wijaya; E. Oktarinasari; F. Mahdyrianto; Erwedi
Jurnal Pertambangan Vol. 9 No. 3 (2025): Agustus 2025
Publisher : Fakultas Teknik Universitas Sriwijaya

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Abstract

The plan for overburden stripping at PT Bumi Sekundang Enim Energy's Pit AB was 332,829.17 BCM/month, but the company was unable to achieve this target. This study aims to evaluate the performance of overburden stripping, identify obstacles that affect overburden stripping, and calculate the costs of overburden stripping before and after improvements are made to overcome these obstacles. This study uses a descriptive-analytical quantitative approach with a case study at PT Bumi Sekundang Enim Energy. The actual productivity of the transport equipment obtained is 20.5 BCM/hour, lower than the specified target of 22.37 BCM/hour. The failure to achieve this overburden stripping was due to obstacles that reduced effective working time and mechanical equipment efficiency. Improvements were made to delay time and idle time, successfully reducing total downtime by 40.64%. As a result, mechanical equipment efficiency increased to 77.82%. After the improvements were made, the productivity of the transport equipment increased to 25.67 BCM/hour and the overburden stripping target was achieved with a percentage of 114.76%. The operational costs of overburden stripping consist of excavation and transportation costs by mechanical equipment. The costs taken into account include fuel, lubricants and filters, tire and undercarriage replacement, ground engaging tools replacement, and operator wages. The operational cost of stripping overburden before the improvement was Rp 20,473/BCM, but after the improvement, the cost decreased by 20.14% to Rp 16,350/bcm.
KONTRIBUSI SEKTOR PERTAMBANGAN BATUBARA TERHADAP PEMBANGUNAN BERKELANJUTAN: ANALISIS DATA PANEL REGIONAL SUMATERA SELATAN F. Mahdyrianto; M. Puspita; R. Fajri; I. Purwadi
Jurnal Pertambangan Vol. 10 No. 1 (2026): Februari 2026
Publisher : Fakultas Teknik Universitas Sriwijaya

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Abstract

Sektor pertambangan batubara merupakan kontributor utama Produk Domestik Regional Bruto (PDRB) di Provinsi Sumatera Selatan, namun kontribusi ekonomi tersebut belum tentu sejalan dengan peningkatan kualitas pembangunan berkelanjutan daerah. Ketimpangan antara pertumbuhan ekonomi dan capaian sosial-lingkungan menimbulkan pertanyaan mengenai efektivitas sektor ekstraktif dalam mendorong pembangunan yang inklusif dan berkelanjutan. Penelitian ini bertujuan menganalisis pengaruh sektor pertambangan batubara terhadap pembangunan berkelanjutan kabupaten/kota di Provinsi Sumatera Selatan. Penelitian menggunakan pendekatan kuantitatif dengan data panel 14 kabupaten/kota periode 2015–2025. Variabel dependen adalah Indeks Pembangunan Berkelanjutan (IPB) yang dikonstruksi dari indikator ekonomi, sosial, dan lingkungan, sedangkan variabel independen utama adalah PDRB subsektor pertambangan batubara. Analisis dilakukan menggunakan regresi data panel dengan pendekatan Fixed Effect Model (FEM) berdasarkan hasil uji Chow dan Hausman. Hasil estimasi menunjukkan bahwa sektor pertambangan batubara tidak berpengaruh signifikan terhadap IPB (p-value 0,8201) dengan koefisien negatif sebesar -0,185. Temuan ini mengindikasikan bahwa besarnya kontribusi ekonomi batubara belum mampu mendorong peningkatan kualitas pembangunan berkelanjutan secara signifikan di tingkat daerah. Dengan demikian, diperlukan penguatan tata kelola dan optimalisasi pemanfaatan pendapatan sektor pertambangan untuk mendukung pembangunan jangka panjang yang lebih inklusif dan berkelanjutan.
MECHANICAL EQUIPMENT INVESTMENT ANALYSIS TO MEET PRODUCTION TARGETS AT PT ABC, NORTH BENGKULU R. Fajri.B; F. Mahdyrianto; M. Puspita
Jurnal Pertambangan Vol. 10 No. 2 (2026): Mei 2026
Publisher : Fakultas Teknik Universitas Sriwijaya

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Abstract

The reallocation of production equipment to a subsidiary in 2025 significantly reduced fleet availability at PT ABC, preventing the company from meeting its annual coal production target of 617,000 tons. This decline in productivity necessitates immediate and meticulous investment planning for additional mechanical units to ensure long-term operational continuity. This study aims to analyze the requirements for loading and hauling equipment, calculate investment cost components, and determine the most efficient procurement scheme among cash purchase, leasing, and rental. Utilizing the Discounted Cash Flow (DCF) method, the research evaluates investment criteria such as Net Present Value (NPV), Internal Rate of Return (IRR), and Payback Period (PBP), while conducting a sensitivity analysis on coal price fluctuations and operational costs. The results indicate that the leasing scheme is the most profitable alternative, yielding the highest NPV of IDR 12,877.68 million, an IRR of 27.45%, and a payback period of 3.45 years. Sensitivity analysis reveals that a 5-10% decrease in coal prices exerts a more significant impact on declining profitability compared to an equivalent increase in operational costs. Consequently, the leasing scheme is recommended as the primary strategic choice due to its superior initial cash flow flexibility and market risk resilience.
EFFECT OF HAUL ROAD GEOMETRY ON THE HAULER PRODUCTIVITY IN COAL MINING Mega Puspita; Bochori; Arie Putra Usman
Jurnal Pertambangan Vol. 10 No. 3 (2026): Agustus 2026
Publisher : Fakultas Teknik Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/0g7gwj92

Abstract

In surface coal mining, haul road geometry directly influences vehicle travel times, motion resistances, and production output. In May 2025, coal production at PT X reached only 95.49% (28,399.74 tons) of its 29,741 ton target due to geometric bottlenecks along the 1.45-km haul road. This study evaluates the haul road geometry against Kepmen ESDM No. 1827 K/30/MEM/2018 and AASHTO standards, analyzing the productivity gains after geometric redesign. Primary data were gathered via GNSS RTK and clinometers, followed by rimpull-based cycle time modeling on a fleet of five Hino 500 FM 280 JD dump trucks. Field results revealed geometric non-compliances, including an excessive 10.06% grade on segment B–C (standard max. 8%), narrow curve widths on segments F–G (13.56 m) and K–L (11.01 m) against the 14.57 m standard, and substandard superelevation across all curves. The actual single-truck cycle time averaged 17.43 minutes, producing 44.83 tons/hour. Following geometric improvements—cutting the B–C grade to 6.28% and widening curves—cycle time decreased by 8.77% to 15.90 minutes. Consequently, single-truck productivity increased to 49.14 tons/hour (total fleet: 245.70 tons/hour), driving monthly output to 31,130.19 tons (104.67% of the target, reflecting a 9.61% increase). Aligning mine haul road geometry with technical standards significantly optimizes hauling efficiency and ensures production targets are met.
Co-Authors A. G. Marbun D A. P. Gobel A. Triando A. Triando A.M.M.Rus A.P. Wibowo A.P. Wibowo Alek Al Hadi Almentirado, M. D. Amalia, R. Arafiq, R. M. Arie Putra Usman Asof, M. Azizi, M. A. Bimbi Cahyaningsih Bochori Bochori . Bochori Bochori Bochori Bochori Bochori Harry Waristian D. Andarini D. I. Arifianto Dahani, W. Diana Purbasari Dino, K. Dirta Pratama Atiyatna E. Ibrahim E. Ibrahim E. Oktarinasari Eddy Ibrahim Erwedi Erwedi Eva Oktarinasari F. Mahdyrianto Gobel, A. P. H. Nashita H. Nashita I. D. A. Purbasari I. Marwanza I. Purwadi Ibrahim, E. Ibrahim, M. M. Idarwati Idarwati Irfan Marwanza K. Dino K. Dino Lusitania M. A. Azizi M. A. Azizi M. Asof M. Asof M. D. Almentirado M. Ibrahim, M. Mahdyrianto, F. Marbun, T. Marwanza, I. Maulana, Y. Mochammad Malik Ibrahim Muhammad Hidayat Mukiat . Mukiat . Mukiat ., Mukiat Nashita, H. Nina Tanzerina Oktarinasari, E. Purbasari, I. D. A. R. Amalia R. Fajri R. Fajri.B R. M. Arafiq Ridho Pranata Rosihan Pebrianto RR. Yunita Bayuningsih S. Wijaya Saggaf, Abdullah Sri Destita K Stevanus Nalendra Jati T. Marbun Taufik Arief Triando, A. W. Dahani W. Dahani Wibowo, A.P. Wijaya, S. Y. Maulana Y. Maulana Yogie Zulkurnia Rochmana