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Franto
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Earth & Planetary Sciences Education Energy Engineering Environmental Science Materials Science & Nanotechnology

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Journal : mineral

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Kajian Teknis Kinerja Alat Rod Mill terhadap Pengecilan Ukuran Butir di PT Babel Utama Korpora Site Pemali Kabupaten Bangka: Technical Study of Rod Mill Performance on Grain Size Reduction at PT Babel Utama Korpora Site Pemali Bangka Regency Chaca, Manisa; Janiar Pitulima; Franto
MINERAL Vol 9 No 2 (2024): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/96an1n30

Abstract

Unit produksi SHP PT BUMAKO Site Pemali merupakan mitra Timah Tbk yang mengolah sisa hasil pengolahan timah untuk diproduksi kembali berdasarkan Keputusan Menteri No. 1827 tahun 2018. Proses pengolahan SHP timah primer di PT BUMAKO menggunakan alat penggerusan berupa Rod Mill dengan proses basah dan proses pencucian menggunakan alat konsentrasi berupa shaking table. Produk hasil dari Rod Mill Upgrading diharapkan minimal 50% berukuran ≥60 mesh. Namun, hasil ukuran penggerusan aktual di PT BUMAKO hanya mencapai 30% dari target. Hal ini disebabkan belum adanya penetapan variabel pada alat tersebut. Akibat rendahnya efektivitas penggerusan tersebut mengakibatkan biaya produksi tinggi dan terganggunya proses konsentrasi, oleh karena itu dilakukan penelitian menggunakan alat Rod Mill dengan memvariasikan 3 variabel sebanyak 12 kali percobaan yaitu, waktu penggerusan sebanyak 2 variasi (1,5 jam dan 2 jam), jumlah batang rod sebanyak 3 variasi (25, 23 dan 21 batang) dan volume air sebanyak 2 variasi (140 L dan 150 L air). Hasil pada 12 kali percobaan menunjukkan persentase lolos tertinggi sebesar 59,25% dan persentase lolos terendah sebesar 41,63%. Variabel penggerusan yang paling efektif yakni waktu penggerusan selama 2 jam, jumlah batang rod sebanyak 25 batang dan volume air sebanyak 140 L dengan produk persentase lolos mesh 60 sebesar 59,25%.
Kajian Teknis Flyrock Dan Jarak Aman Minimum Peledakan Di Jobsite PT Unggul Dinamika Utama Site PT Indexim Coalindo: Flyrock Technical Study and Minimum Safe Distance for Blasting at PT Unggul Dinamika Utama's Jobsite at PT Indexim Coalindo's Site Indra, M Alfarie; Franto; Guskarnali
MINERAL Vol 10 No 1 (2025): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/bwj5jg83

Abstract

This study examines the condition of flyrock and safe blasting distance at the jobsite of PT Unggul Dinamika Utama-PT Indexim Coalindo in East Kutai, East Kalimantan. The study was conducted at Pit Tempudo 6 by collecting blasting geometry data and actual flyrock points using GPS as many as 30. The research method used was the actual calculation of flyrock throwing distance using Pythagoras and the predicted calculation of flyrock throwing distance using the theory of Richard and Moore and Ebrahim Ghasemi which was then carried out a technical study of flyrock and minimum safe blasting distance. The processing results showed the use of an average blasting geometry with a burden value of 7.86m, spacing of 8.96m, stemming of 3.64m, blast hole depth of 7.05m, powder column of 81.64kg with the furthest actual flyrock distance of 90.3m. The influence of blasting geometry parameters obtained a burden value of 0.01%, spacing of 0.86%, Stemming of 18.09%, blast hole depth of 6.38%, powder column of 2.21%. Stemming has a high influence on flyrock, with a percentage of 18.09%. Additional factors such as inadequate site preparation and insufficiently dense stemming also contribute to flyrock. Theoretical predictions after the calculated data were transformed showed that the Richard and Moore cratering factor method had the closest results, at 24%, compared to Ebrahim Ghasemi's 29%. Based on technical studies, the recommended safe radius is 181 m for heavy equipment, while for humans it remains at 500 m.
Evaluasi Safety Maturity Level Dengan Metode Saaty Di Tambang PT Mitra Stania Prima, Desa Cit/Mapur Kabupaten Bangka.: Evaluation of the Safety Maturity Level Using the Saaty Method at PT Mitra Stania Prima Mining Site, Cit/Mapur Village, Bangka Regency Lingga, Yesi Crystiyanti Hangelina Br; Franto; Harsiga, Edwin
MINERAL Vol 10 No 1 (2025): MINERAL
Publisher : Program Studi Teknik Pertambangan Universitas Bangka Belitung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33019/96mbh329

Abstract

This study aims to evaluate the Safety Maturity Level within the mining industry using the Analytical Hierarchy Process (AHP) method developed by Saaty, allowing for objective and systematic prioritization of influencing factors. A case study was conducted at PT. Mitra Stania Prima, a tin mining company, with the assessment framework referring to the Decree of the Director General of Mineral and Coal No. 10.K/MB.01/DJB.T/2023 concerning the measurement of mining safety maturity levels. The evaluation considered four key indicators: Worker Participation (weight: 0.134, categorized as Proactive), Responsibility of Work Unit Leadership (weight: 0.296, Proactive), Accident and Occupational Disease Statistics and Analysis (weight: 0.164, Planned), and Control Efforts (weight: 0.216, Planned). The results indicate that PT. Mitra Stania Prima achieved a total score of 0.806, placing it at Level 4 (Proactive) on the Safety Maturity Level scale. The most influential factor was the Responsibility of Work Unit Leadership (eigenvalue: 0.44), followed by Control Efforts (eigenvalue: 0.39). It can thus be concluded that the company's current safety maturity is categorized as Proactive, with a final score of 0.81. To achieve the highest level, Resilient (score of 1.00), the company is advised to improve by 0.09 points by strengthening critical aspects, including addressing safety audit findings, digitalizing safety documentation, and involving third-party vendors in enhancing overall safety maturity.
Co-Authors Chaca, Manisa Edwin Harsiga Guskarnali, Guskarnali Indra, M Alfarie Janiar Pitulima Lingga, Yesi Crystiyanti Hangelina Br Satrya Sembiring, Raskita Alan Tarigan, Arjunanta