China
Africa
Explore chapters and articles related to this topic
Prediction of stability of haul roads over old underground workings through equivalent material model studies
Published in Tad S. Golosinski, Val Srajer, Off-Highway Haulage in Surface Mines, 1989
K.K. Gupta, D.P. Singh, T.N. Singh, B. Singh
Most of the coking coal resources of India are confined in Jharia Coalfield. A notable feature of this field is- the occurrence of 18 seams, out of which 9 are prime coking and others are of matching nature. The good quality coking coal seams were worked by bord and pillar system in a haphazard manner leaving honey combs of old workings. Mining in such areas by underground methods is less feasible costlier and does not permit full extraction of coking coal which is so vital for the steel industry of our country. Large scale multi-seam open-cast mining is planned down to an ultimate depth of 500m. for extraction of all virgin and partially extracted seams. The coal-field on its northern fringe is divided into 9 major open cast blocks in its reconstruction plan (See Fig. 1). A major slope stability problem is envisaged due to presence of old underground workings. The problem of stability of haul roads would be further aggravated due to periodic movement of machinery.
Geomechanical modelling for optimisation of slope design parameters in opencast mines in Jharia coalfield, India
Published in A. Kidybiński, M. Kwaśniewski, Modelling of Mine Structures, 2021
K.K. Gupta, D.P. Singh, V.K. Singh, T.N. Singh
Most of the coking coal resources of India are confined in Jharia coalfield. A notable feature of this field is the occurrence of 18 sems out of which 9 are prime coking and others are of matching nature. The good quality coking coal seams have been partly worked by ‘bord and pillar’ system in a haphazard manner leving honey-combs of old workings and resulting fires. Mining in future, by underground methods on large scale in this area would be costlier and may not permit full extraction of coking coal which is so vital for the steel industry of our country.
Potential Use of High Ash Indian Medium Coking Coal in Stamp Charged Coke Making
Published in International Journal of Coal Preparation and Utilization, 2019
H. P. Tiwari, S. K. Haldar, Arijit Das, Prakhar Mishra, Abhishek Kumar, P. Khattri
Tata Steel, India has captive mines at West Bokaro and Jharia. The West Bokaro Coalfield forms a part of Damodar Valley coalfields and is one of the important coal producing areas having medium coking coal. The Jharia Coalfield is a part of the east–west aligned Damodar–Koel Group of Gondwana basin of India. Jharia coal field has prime coking coal with high ash and poor washability characteristics resulting in lower yield. Both West Bokaro and Jharia have the limited reserve, but consumption of coking coal increases due to 3.0 MT expansion project carried out at Tata Steel Jamshedpur plant. Therefore, it was felt necessary to develop a methodology to potentially utilize the high ash captive coal in stamp charge coke making for prolonging its deposit. Hence, Tata Steel adopted a strategy called “Trilemma,” that is, cost-quality-volume optimization to achieve maximum benefit of its captive coal because 1% increase in coal ash lead to approximately 4% increase in clean coal yield and thus cost reduction by replacing imported coal [25]. The objective of this work is to maintain the consistent level of coke quality with higher clean coal yield through modulation of its clean coal ash.
Coalbed methane-produced water characteristics and insights from the Jharia coalfield in India
Published in Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 2018
Udayan Singh, Ajay K. Singh, Dhirendra B. Singh
The Jharia coalfield is located in the Dhanbad and Giridih districts of the Jharkhand province in India and contains the only prime coking coal deposits in the country. While there is considerable petrographic and chemical homogeneity throughout the coalfield, there are significant differences within the management practices pertaining to geo-mining and hydrogeological conditions (Singh 2000). The moisture content of the coal in this coalfield is low (< 2%) but the ash content is significant. The vitrinite reflectance varies in the range 1.2–1.75% (Chatterjee and Paul 2013). The coalfield may be divided into four formations (Gupta 1999), described as follows in Mukherjee (2011): The Raniganj formation consists of well-sorted and mature sandstone, grey shale and multiple thin coal seams, which are impersistent or have limited aerial spread.The Barren measure formation does not have much coal except for extremely limited thin impersistent bands and streaks.In the Barakar formation, the presence of medium to coarse-grained arkosic sandstone, grey and carbonaceous shale and a large number of coal seams has been noted.The Talchir sedimentary column starts with a boulder bed at the base and is overlain by needle shales and progressively upward by fine to medium-grained sandstone.