. Bulletin. Per tonmined, ap-proxi-mate. Red Ash. Ross Bennett. Five-foot Do Hillman Do All beds Red Ash and Ross All except Red Ash and Ross beds. Total return ....do South basin (No. 25 tun-nel). Central east (No. 23 tun-nel). Southernmost (No. 11 tun-nel). East side West side East side West side Two shafts North shaft South shaft 193 228 89167208116 1,930709 1,221 Cubic feet. 1,067 714 70 431 508 400 70 552 167 3,701 1,781 1,920 Cubic ,40015,6002,000 3,230 3,200 6,400603,8502,0702,7613,6172,264 GAS IN NORTHERN PENNSYLVANIA ANTHRACITE FIELD. 121 INFLUENCE OF RI
. Bulletin. Per tonmined, ap-proxi-mate. Red Ash. Ross Bennett. Five-foot Do Hillman Do All beds Red Ash and Ross All except Red Ash and Ross beds. Total return ....do South basin (No. 25 tun-nel). Central east (No. 23 tun-nel). Southernmost (No. 11 tun-nel). East side West side East side West side Two shafts North shaft South shaft 193 228 89167208116 1,930709 1,221 Cubic feet. 1,067 714 70 431 508 400 70 552 167 3,701 1,781 1,920 Cubic ,40015,6002,000 3,230 3,200 6,400603,8502,0702,7613,6172,264 GAS IN NORTHERN PENNSYLVANIA ANTHRACITE FIELD. 121 INFLUENCE OF RIVER, DEPOSITS. As most of the Lance workings south of the shaft lie below riverdeposits of varying thickness, it appeared possible that these mightaffect the occurrence of gas in the beds below. Part of the depositsare thick and contain considerable clay which would tend to retardthe general outflow of gas from the coal. Special attention wasgiven to this feature, and as there were many bore holes the extent. |i£\^VvjRock at or near surface. x Figures show bore holes, with depth to rock. Margin of Lance workings Irregular solid and brolcen lines show thickness of valley filling, vertical intervals 50 feet. Figure 27.—Sketch map showing thickness of valley filling, Lance mine. The and thickness of the valley filling could be ascertained,principal data bearing on this are given in figure 27. This map shows a deep central channel with the rock rising to ornear to the surface on either side. At the deepest place the filling ismore than 250 feet thick, and there is a wide area in which it is morethan 150 feet, thick. Although sand and gravel are the principalmaterials, there is enough clay to affect permeability decidedly. Apromontory of rock southwest of the Lance shafts is a notable featureand the sandstone which comes to the surface must be the avenue of 122 EXPLOSIVE GASES IN COAL MINES. escape tor considerable gas. It is a fact that the most gaseous partsof the Lance working
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
