Reports of the Inspectors of Mines of the anthracite and bituminous ...

No. 12.] Seventh Bituminous District. 465
center of a larg-e and valuable coal property, and the inside operations
are already developed sufficiently to employ upward of two hundred
miners.
Mines on the Millers Run Railroad.
Ressing.—This mine was formely known as Laurel Hill No. 2. The
ventilation is below the requirements, a larg-e fan is needed, which the
operator has promised to provide in the very near future. Quantity of
air in circulation when last measured 26,000 feet per minute. This is con-
siderably over 100 feet per minute for each person employed, but as a
considerable quantity of powder is used to blast the coal down, tog-ether
with the fact that explosive g-as is g-enerated, necessitates a verjr brisk
air-current to keep the workings in a safe healthy condition.
Ridgeiuay Valley.—This is a new opening- and is destined to become
a large operation ; they have already sunk a shaft to the coal bed and
commenced to drive entries, they are also driving a slope for a main
hoisting- way, but will not be ready to produce much coal for several
months to come.
Mines West of the Allegheny River.
Pine Greek.—When last visited there were 30,500 feet of air per
minute passing- into the mine, but it was not very well distributed to
the face of the mine, I requested the mine-boss to erect more stoppings
and to repair the old ones so as to cause a better circulation of the aircurrent
at the face of the entries. I have since been informed by him
that the matter has received his attention and that all parts of the mine
are now well ventilated.
Glenshaw.—Number of person employed in the mine is only 23. Quan-
tity of air passing at the outlet 6,200 feet per minute, about one-half of
this amount is passing the face of the mine.
Hites.—In the early part of the year the ventilation at the face of the
mine was not properly attended to, the doors being left standing o})en,
allowing the air to go direct to the furnace instead of passing throug-h
the working places, but on my last visit, matters were found to be much
improved and the air-current reasonably well distributed to the face of
the mine. Quantity of air in circulation 13,500 feet per minute.
Breckinridge.—This is a new mine employing at the present time
about 20 miners, and was in fairly good order when last visited. Quantity
of air passing- 10,000 feet per minute, produced by a small furnace. The
product is being used to coal the railroad eng-ines, but the tipple is arranged
for shipping- purposes.
Natrona.—Some of the entries and a few rooms were found to be
working too far in advance of the air current, in all other respects the
mine was in good order at the time of my last visit. Quantity of ai)- in
circulation 9,000 feet per minute, but this quantity can be increased at
any time if found necessary. Number of persons employed about 45.
30-12-91.