The pits are two in number, namely, the G and H. The former or upcast-pit, 12 feet 6 inches in diameter, is the original shaft from which coals were drawn, up to the year 1854, when it became drowned out. The shaft was then sunk as far as the High Main coal-seam, and from there to a point about 60 feet below the Bensham coal-seam, three small staples were put down within the area of the shaft. The rock left between these staples has now been removed to this level, and the shaft sunk to the Low Main or Hutton coal-seam.

The H or downcast and pumping-pit is 17 feet 6 inches in diameter, and has been sunk from a point 378 feet from the surface (it being for some years used only to keep the water at a certain level) to 60 feet below the Bensham coal-seam.

These shafts have passed through the following coal-seams :—

	Thickness.		Depth.
Coal seams.	Ft.	Ins.	Feet.
High Main	6	6	672
Metal	3	0	714
Yard	3	3	816
Bensham	4	9	876
Low Main (yet to sink to, in G pit only)	5	0	1,014

The winding-engine at the G Pit has two cylinders, each 88 inches in diameter by 5 feet stroke; and the drum is 18 feet in diameter and 7 feet wide.

There are two spreading-belts, 5 feet wide by 12 feet long, travelling 12½ feet per minute, and delivering on to two main picking-belts, 5 feet wide by 71 feet long, travelling 50 feet per minute. These in their turn deliver their load on to two ordinary jigging-screens.

The Walker fan is 16 feet in diameter, and capable of giving 200,000 cubic feet of air per minute, with a 4 inches water-gauge, at about 220 revolutions per minute. It is driven by seven ropes on to the fan-pulley, 6 feet in diameter, from the engine-pulley, 15 feet in diameter. The engine has two cylinders, 18 inches in diameter by 8 feet 6 inches stroke, fitted with a Proell governor and expansion-valves. Each cylinder is capable of driving the fan at full speed, with a steam-pressure of 90 pounds per square inch.

The two Cornish engines by Messrs. Harvey & Co., Cornwall, 100 inches by 11 feet stroke, are both capable of raising 2,000 gallons per minute from a depth of 940 feet, with steam at a pressure of 50 pounds per square inch. The pumps consist of three sets, viz.

New engine —

Low set,	forcing	264	feet, with	26	inches ram, and	11	feet stroke.
Middle set	,,	295	,,	26	,,	11	,,
Top set	,,	324	,,	26	,,	11	,,

Old engine —

Low set, 2 lifts,	side by side	264	feet, with	19½	inches	buckets,	and	11	feet stroke.
Middle set,	forcing	294	,,	26	,,	ram	,,	11	,,
Top set	,,	324	,,	26	,,	,,	,,	11	,,