Horizon control technology for selective mining in underground coal mines

Abstract The trend in mining thermal coal is only to mine coal with the lowest sulphur content. In many coal seams, bands of coal with high sulphur content are often present, generally occurring either at the roof or floor level. Methods of selective mining are, therefore, necessary to recover only the low sulphur coal. This paper examines the methods currently in use in mines and the alternative methods that are able or have potential to offer control of shearers and continuous miners where greater thicknesses of coal have to be left in the roof and floor. These alternative methods rely on such characteristics as neutron gamma radiation; electromagnetic waves; vibration; infrared; optical; pick force; X-ray fluorescence; conductivity; gyroscopes and laser systems.
Keywords: Coal mining, Mining methods, Underground mining, Thickness measuring methods, Neutron gamma radiation, Electromagnetic waves, Vibration, X-ray fluorescence.
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Summary: The paper addresses the application of automated monitoring, control, and navigation to improve dragline performance. Summary Improving dragline performance in the Canadian coal mines is critical to the continued success of the industry. Draglines represent a large capital investment and coal prices are low by historic standards. This paper argues that the introduction of monitoring, control, and navigation on draglines offers an opportunity to significantly reduce a dragline's operating cost...
Publication: CIM Bulletin
Author(s): J. Hansen
Keywords: Dragline cruise control systems, Open pit mining, Equipment.
Issue: 1040
Volume: 93
Year: 2000
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Summary: This paper reports on the development of selective
flocculation processes for the direct recovery of KCl values from low-grade
Canadian sylvinite and carnallite potash ores. Two reagent suites, consisting of
either a non-selective cationic or selective non-ionic flocculant, together with
the same selective anionic dispersant, were evaluated. Initial data from
component mineral behaviour investigations, reagent adsorption studies and
selective flocculation tests on a synthetic potash ore...
Publication: CIM Bulletin
Author(s): C. Poole, S.A. Beeson
Keywords: Mineral processing, Flocculation processes, Selective flocculation processes, Sylvinite, Carnallite potash, Potash.
Issue: 1040
Volume: 93
Year: 2000
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Summary: The existence of quarries near or even within the boundaries of urban centres is the cause of many environmental problems,
despite their significant contribution to the cities’ development. Hence, the question arises as to how quarrying activities can be compromised within the spirit of sustainable development
in big cities. In the case of Athens, two dominant, though opposite opinions have been formed. The first argues that all quarries must be forced to suspend their activities as soon...
Publication: CIM Bulletin
Author(s): D.C. Kaliampakos, A.G. Benardos
Keywords: Quarrying, Sustainable development, Environmental issues
Issue: 1040
Volume: 93
Year: 2000
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Summary: Mine-wide (MW) microseismic systems use widely spaced transducers to determine the source location and parameters of stronger microseismic events, while high frequency (HF) systems use fewer transducers to monitor local areas for the weaker events that can precede stronger events. Previous monitoring at the Creighton Mine indicated that an HF transducer located 120 m away from an active stope recorded two types of activity in response to production blasting: the first occurring at the same...
Publication: CIM Bulletin
Author(s): S.D. Butt
Keywords: Blasting, Kidd Creek Mine, Microseismic systems, Stress monitoring, Underground mining.
Issue: 1040
Volume: 93
Year: 2000
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