Inclined slicing of a thick coal seam in ascending order - A case study

Abstract This paper deals with the stability investigations carried out at the XIVth seam of Jitpur colliery. The study was conducted to investigate the possible causes of roof cavity formation and face spalling at the middle slice face of block-3 longwall panel and to suggest remedial measures. The instrumentation and monitoring work was carried out in the panel over a period of nine months. On the basis of observations, it was found that if the maximum face span was reduced from the existing 4.8 m to 3.6 m, and if the face time schedule cycle was reduced from a maximum of 37 days to about 18 days, this problem could be eliminated. The recommendations of CMRI have been implemented in the middle slice face of block-4 panel with success.
Keywords: Stability, Slicing, Face spalling, Roof cavity formation, Extraction, Longwall mining
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Summary: Mineral exploration properties are those
on which an economically viable mineral
deposit has not yet been discovered. Such
properties are bought, sold, optioned and joint
ventured on the basis of their perceived potential for the existence and discovery of a viable mineral deposit. The intrinsic value of an exploration property is therefore based on the exploration potential. One measure of the
exploration potential is the amount that can be
justified to spend on exploration for a viable
depo...
Publication: CIM Bulletin
Author(s): W.E. Roscoe
Keywords: Valuation, Mineral resources, Exploration properties, Appraised value method
Issue: 1059
Volume: 95
Year: 2002
Text
Summary: A series of new, grease-based, solventfree
open gear lubricants were developed to
meet the demanding service requirements of
mining equipment. The use of these products
has resulted in better performance under conditions of temperature extremes and in terms of longer component lives. They have gained widespread acceptance within the mining communities for such applications as the lubrication of mining shovels, draglines and ball mills. These products are WHMIS non-controlled and are environme...
Publication: CIM Bulletin
Author(s): N. Samman, S.N. Lau
Keywords: Mining, Open gear, Gear lubricant, Grease, Multi-service
Issue: 1059
Volume: 95
Year: 2002
Text
Summary: Coal shearers are one of the major
sources of dust and fines in underground coal
mines. Despite considerable research investigations, no comprehensive in situ investigations coupled with extensive laboratory studies on the effects of drum design on generation of dust and fines have been found. It may be for this reason that many major shearer drum manufacturers persistently employ a certain drum-lacing pattern on current coal shearers, which is believed to cause excessive dust and fines in...
Publication: CIM Bulletin
Author(s): O.Z. Hekimoglu, B. Tiryaki, M. Ayhan
Keywords: Underground mining, Shearer drums, Dust, Fines, Coal mines, Tunnelling
Issue: 1059
Volume: 95
Year: 2002
Text
Summary: The valuation of mineral properties in the
U.S. is only partially regulated. The regulations
which have jurisdiction or impact appear to
have such mainly as a consequence of unintended fallout, since the regulations were
designed for other purposes. Court case history can also be important. The combined results are a mixture of bad and good, with important lessons to be learned. Since 1981, the Securities and Exchange Commission has prohibited U.S. listed companies from reporting quantitative...
Publication: CIM Bulletin
Author(s): T.R. Ellis
Keywords: Valuation, Mineral properties, Regulations, Standards
Issue: 1059
Volume: 95
Year: 2002
Text
Summary: The use of liquid copper as a medium for
zinc extraction has been used in the Warner
Process as a method of processing zinc-lead
sulphide ore. The recovery of zinc metal is
based on the reaction: ZnS(s) + 2Cu(l) = Zn(g) + Cu2S(l) In this method, thermodynamic and phase equilibria investigations of the Cu2S-FeS-ZnS and Cu2S-PbS-ZnS systems are of importance and form the basis for the liquid sulphide phase which appears as a product and is used as a solvent in the Warner Process. Phase...
Publication: CIM Bulletin
Author(s): C.M. Nyamai, S. Surapunt, K. Itagaki
Keywords: Extraction, Sulphide, Zinc, Liquid copper, Smelting
Issue: 1059
Volume: 95
Year: 2002
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