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Muhammad Ikrar Lagowa
Fakultas Sains Dan Teknologi, Universitas Jambi
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Analisis Flyrock Untuk Mengurangi Jarak Evakuasi Alat Menjadi 200 Meter Pada Peledakan Overburden Di Kecamatan Marangkayu, Kalimantan Timur: Flyrock Analysis to Reduce Equipment Evacuation Distance to 200 Meters in Overburden Blasting in Marangkayu District, East Kalimantan Putri Juwita Oktaviani; Aditya Denny Prabawa; Muhammad Ikrar Lagowa
MINERAL Vol 10 No 2 (2025): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/xepqw420

Abstract

Penerapan radius aman alat sebesar 300 m pada peledakan overburden yang dilakukan setiap hari meningkatkan frekuensi Internal Operasional Delay (IOD), yang berdampak negatif terhadap efisiensi operasional dan meningkatkan konsumsi bahan bakar alat saat melakukan perpindahan menuju radius aman. Analisis Flyrock dilakukan menggunakan batuan berukuran ≥10 cm, dengan pengambilan data menggunakan GPS dan pengamatan arah lemparan flyrock melalui video drone dan pengamatan visual. Estimasi jarak lintasan flyrock maksimum ditentukan berdasarkan metode Richard dan Moore (2005), dengan memperoleh konstanta (k) yang disesuaikan dengan karakteristik batuan di lokasi. Nilai prediksi flyrock paling mendekati nilai aktual terjadi pada cratering, dengan persen error terkecil 18,33% dan penyimpangan 12,65 m. Faktor utama yang mempengaruhi jarak lemparan flyrock aktual adalah stemming dengan nilai sebesar 81,50%. Penentuan pengurangan jarak evakuasi alat menjadi radius aman 200 m menggunakan teori exclusion zone oleh Richard dan Moore (2005) dan penentuan skala kedalaman menggunakan teori (SDOB), menghasilkan standar nilai variabel tinggi stemming minimal 3,3 m pada kedalaman 7,80 m.  
Potensi Logam Tanah Jarang (LTJ) pada Parting Batubara dan Estimasi Sumberdaya Hipotetik di PT Kuansing Inti Makmur: Potential of Rare Earth Elements in Coal Parting and Hypothetical Resource Estimation at PT Kuansing Inti Makmur Putri Abby Larassati; Muhammad Ikrar Lagowa; Yudi Arista Yulanda
MINERAL Vol 11 No 1 (2026): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/rxeqva45

Abstract

Rare Earth Elements (REEs) have become critical components in modern technology; however, global reliance on Chinese supply (>80%) and the scarcity of economic deposits necessitate the diversification of REE sources, including utilizing coal ash. This study examines the REE potential in coal parting as the primary source of coal combustion ash materials at PT Kuansing Inti Makmur (PT KIM), Bungo Regency, Jambi Province, which features multi-parting coal characteristics with a high ash content (14.36%). The methodology includes Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) analysis for REE quantification and petrographic analysis for mineralogical characterization. The results reveal that the total REE content in the parting reaches 180.01 ppm, dominated by Cerium (Ce) (65.68 ppm) and Neodymium (Nd) (38.91 ppm). Petrographic analysis identifies the REE-bearing host rock as siliciclastic sediment composed primarily of quartz and feldspar within a clay matrix. Based on a parting volume of 85,000 m3, the hypothetical resource estimation yields a total potential of 32.13 tonnes of REE, including Ce (11.7 tonnes) and Nd (6.9 tonnes). These findings indicate that the high-ash, multi-parting coal parting at PT KIM holds significant potential as an alternative REE source through the utilization of residual coal combustion ash. The presence of REE within the parting enables its accumulation and enrichment during the combustion process.
Kajian Efektivitas Metode Injeksi dan Metode Konvensional pada Penanganan Air Asam Tambang Berdasarkan Parameter pH dan TSS: Study of the Effectiveness of Injection Method and Conventional Method in Acid Mine Drainage Treatment Based on pH and TSS Parameters Gita Lestari; Muhammad Ikrar Lagowa; Jarot Wiratama
MINERAL Vol 11 No 1 (2026): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/an857864

Abstract

Acid mine drainage (AMD) is one of the major environmental challenges in coal mining activities and must be properly managed to prevent adverse environmental impacts. Based on the Decree of the Minister of Environment No. 113 of 2003, mining wastewater must have a pH value ranging from 6 to 9 and a maximum Total Suspended Solids (TSS) concentration of 400 mg/L. This study aims to compare the effectiveness of the injection method and the conventional method in treating acid mine drainage at PT Budi Gema Gempita based on pH and TSS parameters. The initial water quality showed a pH of 4.5 and a TSS concentration of 5,420 mg/L, indicating that it did not comply with the established environmental standards. The injection method utilized POWERBASE 3012, POWERCLEAR 1546, and POWERFLOC 4888, while the conventional method employed quicklime and aluminum sulfate (alum). The treatment results showed that the injection method achieved a final pH of 8.6 and a TSS concentration of 26 mg/L, whereas the conventional method resulted in a final pH of 7.2 and a TSS concentration of 1,899 mg/L. Both methods successfully increased the pH to meet the regulatory standard; however, only the injection method reduced TSS below the maximum allowable limit. Therefore, the injection method is considered more effective and has strong potential for sustainable implementation in acid mine drainage management at PT Budi Gema Gempita.
Co-Authors Adhitya, B. Aditya Denny Prabawa B. Adhitya Denny Prabawa, Aditya Dwi Tata Damayanti Ericson Ericson Faizar Farid Faizar Farid Faizar Farid Gindo Tampubolon Gindo Tampubolon Gindo Tampubolon Gita Lestari Itang Ahmad Mahbub J. Wiratama Lucky Zaehir Maulana Lutfi Wahyudi Luthfi Wahyudi Megakusuma, Yosha Megasukma, Y. Muhammad Abror Muhammad El Hakim Ngatijo Ngatijo Niza Desiana Putra, Tommi Mandala Putri Abby Larassati Putri Juwita Oktaviani Rati Kumala Revis Asra Sartika . Sartika . Simarmata, Jhoy Michael Sitanggang, Boy Julius Wahyudi Zahar Wahyudi, Lutfi Wiratama, J. Wiratama, Jarot Y. Megasukma Yosa Megasukma Yosha Megakusuma Yudi Arista Yulanda Zahar, Wahyudi