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

302 REPORT OF THE INSPECTORS OF MINES. Off. Doc.
by the tail rope system of haulage for a distance of about one mile.
At my last examination, I found it reasonably well ventilated. The
draiimge was also good. I measured about 1G,400 cubic feet of air
per minute in circulation in the workings, which is being produced
by a six foot ''Clark" fan.
Fairmount Xo. 4.—This is a comparatively new mine, which I
found in very good condition. I measured 18,3G0 cubic feet of air
per minute in circulation in the mine. The interior workings were
well ventilated. The tail rope system of haulage has been put in
operation at this place. Nearly all the coal produced here is being
mined by coal cutting machinery, seven of the Harrison machines
have been put in operation. These machines are driven by compressed
air. The compressor, boilers and other connected machinery
are all of a substantial character. This mine was idle for three
months, owing to a strike among the miners about the prices to be
paid per ton for machine mining. The three Fairmount mines are all
worked on the double entry plan.
Kun.—This mine was only in fair condition at the date of
Cheri'}'
my last visit. There was a sufficient quantity of air passing into and
out of the mine, but it was not properly conveyed to the face of the
workings. I measured 8,870 cubic feet of air in circulation. There is
no properly constructed ventilating furnace here, but a coal fire was
placed at the bottom of the air shaft as a substitute for it.
The traveling
way was not in proper condition for the miners to travel therein,
but a shaft is being sunk at the face of the workings for this purpose.
The drainage was reasonably good.
Diamond.—At my last examination of this mine I found it in very
good condition. I measured 10,200 cubic feet of air per minute in
circulation, which was fairly well distributed to the interior workings.
The drainage is now very good. This mine is worked on the single
entry plan.
Keystone No. 2.—This mine is comparatively new. An electric
plant has been installed during the year. The most of the coal ifj
being mined by the use of coal cutting machinery. Two machines of
the chain cutter type, or what are known as the Jeffrey machines, are
now in use here. The coal seam is about three and one-half feet thick,
which is overlaid with a very strong and compact shale, making the
natural conditions very favorable for the use of this class of machinery.
A new ventilating furnace has been built, and an air shaft
sunk at this mine duiing the year. I measured IO.I'jOO cubic feet of
air per minute in circulation, which was being well conducted to the
face of the workings. The ventilation and drainage of the mine were
good. The single entry plan of woiking out the coal i)rvails here.
Avondale.—This mine is in very good condition, both in regard to
ventilation and rninage. There was being disti'ibuted throughout the