Coal rank changes in the Sydney and Pictou coalfields of Nova Scotia; cause and economic significance

Abstract The coals of the Sydney and Pictou coalfields are generally classed as high volatile "A " and medium volatile bituminous coals but there are significant differences within and even beyond this rank. These are related to the observation that the coalification in eastern Canada is essentially post-defor-mational, resulting in a general increase of rank with depth in individual seams.
Exploration drilling in the Sydney coalfield has shown that the rank increases offshore to M. V. bituminous at mineable depths and in the Pictou field to L. V. bituminous coal. There is also a marked easterly shift in rank within one seam at the same depth at Sydney, with the result that M. V. coal will be reached sooner in the Donkin Reserve area (at 700 m depth) than in the Lingan-No. 26 Reserve area (at 900 m depth). These rank changes are important for the manufacturing of metallurgical coke as shown with coke stability predictions based on petrographic analyses. The L. V. coal of the Pictou field can be used for blending purposes and is the only known L. V. deposit of mineable thickness in eastern Canada.
In addition, the vertical rank changes between seams have been studied in ten boreholes. They are not constant within the confines of the Sydney coalfield. Four separate areas can be recognized, each with different coalification gradients, which can be related to changes in the paleogeothermal gradients. Variations of 2.5 degrees to 6.7 degrees C/100 m are indicated and geological causes for these changes are suggested.
Keywords: Coal mining, Coal rank, Sydney coalfield, Pictou coalfield, Coalification, Geology, Coking
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Publication: CIM Bulletin
Author(s): WILLIAM M. BRYDEN, DONALD E. WAKEFIELD, SCOTT L. EWART
Keywords: Mining Act, Ontario, Mineral development
Issue: 865
Volume: 77
Year: 1984
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Summary: Planning for coal beneficiation in the electric utility industry is relatively complex, involving the coordination of experts and specialists in a broad range of fields, as well as compliance with a wide variety of government regulations.
This paper examines the role of the planner, reviews possible benefits of coal beneficiation, identifies potential problems and illustrates a typical planning schedule.
The steps involved in the planning process are:
Step 1—Bench- and pilot-washability...
Publication: CIM Bulletin
Author(s): DENNIS NIKOLS
Keywords: Coal preparation, Coal beneficiation, Electric utility, Tailings, Environmental control, Geotechnical engineering
Issue: 865
Volume: 77
Year: 1984
Text
Summary: The design, development, and verification of the Lovat 7.6-metre diameter full-face tunnel-boring machine is reviewed. Programmatic and technical challenges are outlined with a review of the specifications and the design to meet these requirements. Subsystem designs are presented for the waste material removal, ventilation, cutter head, structural support, advance technique, water removal, and interfaces with the Donkin-Morien Mine. The techniques used to verify that the design meets the...
Publication: CIM Bulletin
Author(s): J.A. HUNTER, R. LOVAT
Keywords: Coal mining, Tunnel boring machines, Underground mining, Donkin-Morien project, Ventilation
Issue: 865
Volume: 77
Year: 1984
Text
Summary: Funding has been made available through the National Energy Program to build a mobile fine coal treatment plant. The plant is intended for field application and also to upgrade the existing pilot plant facilities.
Western Canadian coals with high proportions of fines (due to their friability) cause high losses of fine coal to the reject and in turn reduce the over-all recovery of saleable coal. Eastern Canadian coals with high amounts of sulphur often require crushing to fine sizes to...
Publication: CIM Bulletin
Author(s): M.W. MIKHAIL, R.J. MIKULA
Keywords: Coal preparation, Mobile plant, Coal treatment, Beneficiation, Fine coal
Issue: 865
Volume: 77
Year: 1984
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