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Narwal, Sruti, Deb, Debasis, Islavath, Sreenivasa, Samanta, Gopinath. (1404). Stability Assessment of Stopping Operations in Friable Ore Bodies under an Open Pit Mine using Strength-based Mining Sequence Factor. , 16(2), 479-501. doi: 10.22044/jme.2024.14872.2828
Sruti Narwal; Debasis Deb; Sreenivasa Rao Islavath; Gopinath Samanta. "Stability Assessment of Stopping Operations in Friable Ore Bodies under an Open Pit Mine using Strength-based Mining Sequence Factor". , 16, 2, 1404, 479-501. doi: 10.22044/jme.2024.14872.2828
Narwal, Sruti, Deb, Debasis, Islavath, Sreenivasa, Samanta, Gopinath. (1404). 'Stability Assessment of Stopping Operations in Friable Ore Bodies under an Open Pit Mine using Strength-based Mining Sequence Factor', , 16(2), pp. 479-501. doi: 10.22044/jme.2024.14872.2828
Narwal, Sruti, Deb, Debasis, Islavath, Sreenivasa, Samanta, Gopinath. Stability Assessment of Stopping Operations in Friable Ore Bodies under an Open Pit Mine using Strength-based Mining Sequence Factor. , 1404; 16(2): 479-501. doi: 10.22044/jme.2024.14872.2828

Stability Assessment of Stopping Operations in Friable Ore Bodies under an Open Pit Mine using Strength-based Mining Sequence Factor

Journal of Mining and Environment
مقاله 6، دوره 16، شماره 2، خرداد 2025، صفحه 479-501    اصل مقاله (16.11 M)
نوع مقاله: Original Research Paper
شناسه دیجیتال (DOI): 10.22044/jme.2024.14872.2828
نویسندگان
Sruti Narwal* 1؛ Debasis Deb1؛ Sreenivasa Rao Islavath1؛ Gopinath Samanta2
1Mining Engineering Department, Indian Institute of Technology, Kharagpur, India
2Senior Technologist (Mining), Process Technology Group, Tata Steel Limited, Jamshedpur, India
چکیده
A novel underground mining method is proposed to extract friable chromite ore bodies in weak and weathered limonitic host rock below an open-pit mine. The conventional underground methods do not instil confidence since GSI (Geological Strength Index) of ore bodies and host rock lies below 35. Series of dimensions of transverse stopes along the strike are suggested based on a detailed analysis of multiple mining and backfilling operations by simulating 36 three-dimensional numerical models. For each operation or sequence, a strength-based “Mining Sequence Factor (MSF)” is devised that helps quantifying its equivalent strength compared to in-situ conditions. This factor along with the average equivalent plastic strain (AEPS) developed on the pillars as obtained from numerical models is used to determine the safe operations with desired yearly production target. The paper provides an in-depth analysis of this method and suggests minimum pillar dimensions of 40 m, whether in-situ or backfilled. The paper, in addition, lays the design of underground drives and their support system as per NGI (Norwegian Geotechnical Institute) guidelines and 3D numerical studies, the performance of which is analysed considering distribution of stress and equivalent plastic strain.
کلیدواژه‌ها
Friable ore and host rocks؛ Mining under open pit؛ Novel mining method؛ Mining Sequence Factor؛ Support system
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