Transactions . 000This is a very close approximation to Companys calculation above were worked out from general plan andthe following standards. Work StandardMeasurements Face Brushing. Back Bnishing. Tramming 9 ft. wide 3 ft. long 1 ft. high 12 ft. wide 3 ft. long ft. high 12 ft. wide 3 ft, long ft. high Cost perStandard Cost percu. yd. AverageThicknessAssumed Cost perThickness The New Landing and Lower North Levels were driven 550feet apart. This whole district may be subdivided into threeworkings, two of which are join
Transactions . 000This is a very close approximation to Companys calculation above were worked out from general plan andthe following standards. Work StandardMeasurements Face Brushing. Back Bnishing. Tramming 9 ft. wide 3 ft. long 1 ft. high 12 ft. wide 3 ft. long ft. high 12 ft. wide 3 ft, long ft. high Cost perStandard Cost percu. yd. AverageThicknessAssumed Cost perThickness The New Landing and Lower North Levels were driven 550feet apart. This whole district may be subdivided into threeworkings, two of which are joined, and the third worked out. TheIy)wer North level being part of the original opening developments,it will be discussed before joining the New Landing face 19/11 third or comer district was drawn by gates 1 and 2 of L. gates and their cross gates fed to deeps indirectly througha heading or road almost parallel to main plane of coal (20° to LOXGWALL MiMNG AND Emp:RY PiT—BuRLANH 647 ^ ^ ^ ^. G48 LoNGWALL Mining and Emery Pit—Burland west). This heading extended to New Landing where threeadditional gates fed to that level. The gates were connected by a face gate driven from No. 2gate in a direction 42° south of west and meeting 5 cross gate toright of 1. Work was discontinued shortly afterwards. For comparison, the writer has compiled the following tablesand would give a brief note on the method employed. No officialfigures were available for any tables, and all tables have beendeduced from the working map of the mine, a reduction of which,with total available data, is illustrated by the general plate of theworkings. The object of the following comparisons is to em-phasize the study of correct angles, and spacing of these gatesper ton of coal extracted. Plate 9 is divided into districts ofprogress, and the dates worked out by average proportion fromseveral survey dates recorded. A previous statement shows6,400 feet of gates and cross-gates having 7,655 cubic
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Keywords: ., book, bookcentury1800, booksubjectmineralindustries, bookyear1895
