Report of the Bureau of Mines of the Department of Internal Affairs of ...

406 REPORT OF THE INSi'KCTORS OF MINES. Off. Doc.
Champiou.—x\n 11-foot single inlet Capell fan has been provided
to produce ventilation, and all parts of the mine are now supplied
with an abundance of fresh air. Quantity of air in circulation, 77,000
cubic feet per minute. Speed of fan, 132 revolutions; \V. G., 1.1
inches.
The speed of the fan can be increased to 275 revolutions, or
more, if necessary. The Harrison type of machine is used to undermine
the coal. The hauling is done by the head and tail rope system,
and the coal field is being developed on the double entry system.
Laurel Hill Nos. 1, 2 and 4.—The condition of the No. 1 mine is
better than during the early part of the year. The traveling roads,
escape way and airways have been improved so that the air currents
are conducted to the face of the workings better than formerly, but
the ventilation and drainage cannot be brought up to perfection until
a shaft has been sunk at the face of the workings, which will shorten
the airways about one-half and also act as a discharge outlet for the
pumps used for drainage. Quantity of air at inlet, 65,000 cubic feet
per minute, and from 5,000 to 11,000 cubic feet was measui-ed near the
face of the different entries. The coal is undercut by the Harrison
type of mining machine. Haulage is done by the head and tail rope
system, and the ventilation is produced by a 20-foot Vulcan fan.
The ventilation in the No. 2 mine is also produced by a 20-foot Vulcan
fan, which was passing only 24,000 cubic feet of air per minute,
when last measured; this was inadequate, and I ordered the mine foreman
to increase the speed of the fan. The air volume, as measured in
the different entries near the face of the workings varied from 5,600
to 8,500 cubic feet per minute. Electric mining machines are used
to undercut the coal, and an electric locomotive is used to haul the
product to the bottom of the shaft.
The condition of No. 4 mine during the early part of the year was
ver}' unsatisfactory, but when last examined, considerabU^ improvement
was noticeable, especially in regard to the ventihition and the
condition of the roadways. A passageway is now being driven from
the face of the mine to the surface, which will be of great benefit to the
ventilation and drainage, and it can also be used for a travelling way.
Quantity of air measured near the face of the different entries vai-ied
from 4,000 to 13,000 cubic feet per minute, and 65,000 (iil>ic feet were
measui-ed at the outlet. The Harrison type of mining machine is
in use and the coal is hauled to the bottom of the shaft by the head
and tail i-ope system. A 25-foot Brazil fan is used to i)roduce ventilation.
The mode of operation at each mine is by the double entry
system.
F.rier Hill.—AVlien last inspected, the condition of this mine was
not so good as on former visits; in some instances the ventilation
was not proijerly conducted to the face of the workings and there were
too many men working in the same aii* cnrrent. Average quantity