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Porathur, John Loui
- Exploitation of Mica Deposits at Nellore Mica Belt, Andhra Pradesh, India
Abstract Views :311 |
PDF Views:89
Authors
Subhashish Tewari
1,
Vivek Kumar Himanshu
1,
John Loui Porathur
2,
Rana Bhattacharjee
1,
Arka Jyoti Das
1,
Prabhat Kumar Mandal
1
Affiliations
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 015, IN
2 CSIR-Central Institute of Mining and Fuel Research, Nagpur Unit, Nagpur 440 006, IN
1 CSIR-Central Institute of Mining and Fuel Research, Barwa Road, Dhanbad 826 015, IN
2 CSIR-Central Institute of Mining and Fuel Research, Nagpur Unit, Nagpur 440 006, IN
Source
Current Science, Vol 118, No 4 (2020), Pagination: 593-602Abstract
India is the leading producer of sheet mica and a major part of this is exported. Nellore mica belt is the largest mica-producing area covering part of Nellore district in Andhra Pradesh, India. As most of the mines are old and privately operated, they are developed and operated purely based on local experiences. In this article, we highlight the problems associated with the present mica-mining practices in the Nellore mica belt, and scientific approaches that have been adopted for fixing different parameters associated with mica extraction. Based on detailed field study, geo-mechanical data and tested rock properties, extensive numerical modelling is done to suggest the best possible method of mining for safe and sustainable mica extraction from the area.Keywords
Barrier Thickness, Mica Deposits, Overhand Stoping, Pegmatite, Pillar Design.Full Text
References
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Abstract Views :184 |
PDF Views:73
Authors
Affiliations
1 Hindustan Zinc Limited, Dariba, Rajsamand 313 211, India
2 CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 17/C, Telankhedi, Civil Lines, Nagpur 440 001, India
1 Hindustan Zinc Limited, Dariba, Rajsamand 313 211, India
2 CSIR-Central Institute of Mining and Fuel Research, Nagpur Research Centre, 17/C, Telankhedi, Civil Lines, Nagpur 440 001, India
Source
Current Science, Vol 121, No 7 (2021), Pagination: 920-928Abstract
A methodology using three-dimensional elasto-plastic analysis has been formulated to assess the required strength parameters for a stable backfill wall for various dimensions of a stope. The numerical modelling results show linearly increasing trend for the required backfill cohesion with respect to stope height for longer stopes and curvilinear with flattening trend for shorter stopes. Comparison of the numerical modelling results with those of a popular theoretical equation shows that the theoretical equation fails to represent the interface friction and tension. The numerical modelling methodology is a better tool which can capture a gamut of aspects. The developed methodology has been used to estimate the required pastefill strength and binder percentage for a hard rock mine in North India, where it has been successfully implemented in over 50 stopes without any significant case of backfill failureKeywords
Elasto-plastic analysis, field implementation, hard-rock mining, numerical modelling, pastefillFull Text
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