Relative importance of physical and economic factors in Appalachian coalbed gas assessment USGS Publications Warehouse Attanasi E D 1998 01 01 In the 1995 National Assessment
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Get PriceThe 7 East face had 5 to 6 ft 1 5 to 1 8 m of laminated rock interburden above the Blue Creek seam as well as 4 to 12 in 10 to 30 cm of draw rock immediately above the seam Some areas of the longwall panels had 12 to 40 ft 3 7 to 12 2 m of sandstone above the seams which did not always cave as desired after the longwall passes
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Get Pricearticle{osti 5768053 title = {Longwall face length selection} author = {Gentry D W} abstractNote = {Because the cost of mistakes in longwall face length selection is high it is necessary to have some rational engineering and economic basis for face length selection A computer assisted design routine is described which allows semi fixed parameters seam thickness geologic setting to
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Get PriceDiesel equipment ups productivity Full Record; Other Related Research; Abstract Mining conditions in Southern Utah Fuels s No 1 Mine are excellent with a coal seam averaging 15 ft in thickness good roof and high quality coal Productivity in 1983 reached 30 75 ton/manshift Mining operations are described
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Get PriceVIII Big Vein at Gwaun cae Gurwen East Colliery Proposed Plough Face 1868 Dec 1957 D/D PRO/NCB/6/116 No I Area Morlais Colliery Swansea Four Feet Seams and Thin Coals between 1000ft and 1568ft B Summary of Seams 1777 Feb 1956 D/D PRO/NCB/6/128 No 1 Area Comparison of Running Costs in Solid Fuel and Oil Fired
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Get PriceLyons P C 1998 01 01 The Appalachian basin is the world s second largest coalbed methane CBM producing basin It has nearly 4000 wells with 1996 annual production at 147 8 billion cubic feet Bcf Cumulative CBM production is close to 0 9 trillion cubic feet Tcf
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Get PriceInitial results indicate that a vertical well at 1000ft in a 45ft thick coal seam will yield about 11% gas over 20 plus below To achieve a reasonable gas capture and also to make due allowance for borehole damage as the longwall face retreats three Conventional mine gas drainage equipment was employed rather than the cost
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