Banerjee, G. and Ray, A.K. and Singh, G.S.P. and Yadava, K.P. (2003) Hard roof management - a key for high productivity in longwall coal mines. Journal of Mines, Metals & Fuels, 51 (7&8). pp. 238-244. ISSN 0022-2755

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At present, the share of underground coal production in India has dropped from 73% in 1974-75 to 20% in 1999-2000. The main reason of under-performance of our U/G coalmine projects is its failure to adopt the high production technology like longwall mining. A careful scrutiny of experience gained from the mechanized longwall mining in Indian coal industry reveals coal seams are overlain by hard and massive sandstone rock beds within the active caving zone. Hard roof management helps in eliminating the need of high capacity costly powered supports and ensuring safe and economic extraction of coal. This paper deals with the experience gained during some recent practices of deep hole surface blasting, which has been successfully introduced for managing the caving difficulty at some of the shallow depth longwall faces in South Eastern Coalfields Limited (SECL). Further, this paper describes the findings of experimentation on hard roof management by water injection under high pressure at Churcha colliery. The scope and limitations of these techniques are further elaborated.

Item Type: Article
Subjects: Longwall Mining
Depositing User: Dr. Satyendra Kumar Singh
Date Deposited: 03 Dec 2011 09:52
Last Modified: 03 Dec 2011 09:52

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