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

No. 12.] Seventh Anthracite District. 249
Mammoth vein, south dip. The vein is in fair condition. A tunnel is
being driven from Mammoth vein, south dip, to Buck mountain vein,
south dip ; tunnel is in, 133 yards. A jig house 54'X4:5' deep by 50' 9"
high, containing 5 jigs and all the necessary connections, has been
erected for the better preparation of the coal. An engine, 14" cylinder
by 24" stroke, has been erected to supply power for these jigs.
Merriam Colliery.—The tunnel being driven across the Mahanoy
basin from Mammoth vein, south dip, to Mammoth vein, north dip, has
cut the vein at a distance of 6031 yards. An underground slope has
been sunk in what is known as Big Run basin. The slope is down a
distance of 137§ yards and is completed. A steam pipe way 8' wide by
5 5' high has been driven from the second to the first level, the total distance
being 165 yards. A tunnel 18| yards long has been driven from
Mammoth vein plane gangway to top split of same vein, cutting the
vein in fair condition. A new water line has been laid, connecting with
the Bear Gap Water Company's line which gives the colliery an ample
supply of pure water for all purposes. In addition to the above, several
minor improvements have been made both in and outside at this colliery.
Potts Colliery.—A pair of link motion engines, 18" cylinder by 36"
stroke, with drum and all connections complete, have been erected to
hoist from Primrose slope. A new engine house has been built for
same. The Primrose slope is npw completed, the total depth being 373
yards. The tunnel connecting the Mammoth and Primrose veins is also
completed, the distance being 109 yards. A new fan, 18' diameter with
fan engine and all connections, has been erected for the purpose of ven-
tilating the Primrose vein. All of the above have been enclosed and in
addition a new engine house has been built over said fan engine. The
breaker has been rebuilt and remodeled and is now fitted throughout
with the most im^Droved machinery. The dirt plane has been rebuilt
and the machinery repaired, all of which is now in good condition. Two
standard 9" X 38" steam pumps have been erected for the purpose of
supplying water to jigs located in breaker. One new nest of four boilers,
34" diameter, 30' long, has been put in position ; also two new nests of
two tubular boilers, each 6' diameter by 18' long with all necessary con-
nections, have been added to the steam plant.
Bast Colliery.—The rebuilding of the breaker was completed during
the year 1891. It has been fitted up with the latest improved machinery
and is now one of the best equipped breakers owned by the coal and
iron company.
North AsJiland Colliery.—The Western slope has been extended 100
yards for a new lift. This makes the total distance 359 1 yards. The
airway has also been extended, and now has an area of 96 square feet.
A new frame fan engine house has been erected; also a new fan 15'
diameter with engine and all necessary connections complete. This fan
will ventilate the workings in Western slope. One Allison steam pump,