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

380 REPORT OF THE INSPECTORS OF MINES. Off. Doc.
headings are turned every 390 feet.
The rooms, in some parts of the
mine, are turned off every 42 feet, giving a 24 foot room and an 18 foot
pillar. The room is driven narrow— feet—for a distance of 30 feet,
before being widened out to 24 feet. In otlier parts of the mine three
rooms are turned from one room neck. Tlie latter method lias the advantage
of giving a stronger pillar along the headings and making
fewer frogs and switches, thus lessening the likelihood of the motor
getting off the track from a ])Oorly constructed or niis]»laced switch.
All the mining is done by nuichincs driven by compressed air. The
machines now used are the Ingersoll-Sargeiit, Harrison ^: Sullivan,
all of the puncher type.
The mine is well ventilated by a 12xl(H reversible ('ajK'll fan,
driven by a. 17x18 inch Taylor engine, directly connected, and constructed
almost entirely of steel.
The hauling is done vntirely by electric motors, and not a horse or
mule is in the mine. At present two general electric motors, weighing
ten tons each and rat«Ml at eighty horse power are used to do the
work. KiU'h of these can easily haul thirty loaded mine cars on a
grade of one per cent, against the loads. The machinery in the ])ower
house consists of two 242 horse ]»ow, near Scaljt
Le\('l on the same general i>lan as "No. 30,'' and the eipiipment of
these, when completed, will
be about the same.
South Foi-k District.
"Webster No. 3" is the largest mine in the district, having the greatest
output of coal for 18t)7. There are two hauling ropes and two
fans for ventilating—one used for the up])er part of the mine, lying
above the water knel, and the other for the dij) workings. The veii
tilation, drainage and geiieial conditions of this colliery are good, as