PRESENT CONDITIONS UNDER SCRANTON.
Delaware, Lackawanna & Western Coal Co. collieries.
NATIONAL COLLIERY.
(Works South Scranton section, from Beech Street to city line, and from river to outcrop.)
General conditions.
Eroded.
Do.
73 acres mined. Depth, see section on Plate 20; thickness of Big vein, 12 to 14 feet; of New County, 5 feet; close together and near surface; long since mined and caved; now reopening to reclaim the pillars.
176 acres mined. Depth, see section on Plate 20; thickness, 4 feet 7 inches, includes 11 inches of refuse; openings large and pillars small and chipping in old workings; in recent workings nearer out crop chambers 25 feet and pillars 26 feet; chambers one-half filled with gob; roadway on side about 10 feet wide; pillars sound.
This bed here too thin to mine.
752 acres mined. Depth, see sections on Plates 19,20, and 21; thickness, 8 feet 6 inches with top bench mined; 2 feet 7 inches contains about 1 foot 4 inches of coal.
These are mainly very old workings which have been partly remined since old maps were made, hence pillars are not as shown on map. Pillars average small; openings large. In many places pillars are chipped and cracked from pressure. Mines now being resurveyed. No mining under city in this bed at present.
This bed very thin; not mined.
Coal beds.	Name of school.	Mining conditions under school properties.
		
		
		
		
		
Big and New County.	No. 7		Big bed eroded under all school property; about over outcrop of New County vein. Depth, 72 feet; nearest chamber, 60 feet from lot; now working toward school; not mined under school at present; this bed eroded under the other school properties on the south side.
		
		
	No. 7		Depth, 195 feet; approached to within 40 feet of school; too dangerous to go under school; pillars small and weak, partly crushed; indicate incipient squeeze. Depth, 157 feet; workings open; pillars small but sound; openings large; roof good. Depth, 96 feet; pillars very small; openings large; gob piers built-roof strong; no caving. Depth, 170 feet; mined but inaccessible on account of being filled with water. Depth below cellar of school, 11 feet; shaft in school yard, through sandstone; coal pillars small, openings large; 12 sandstone and cement piers 9 feet square; conditions at present good.
	No. 11		
	No. 10		
	No. 8		
	No. 15		
		
		
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