The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1918-05-09

Engineering and Mining JournaD
both the Burke and Wallace Mines
has made use of the cement gun in
recent improvements, with a saving
OF time and money. The canyon at
Burke is very narrow, and in order
to provide ample failing and waste
dumps, the management has found it
necessary to build high cribbing to
impound the waste. The machine
shops, sorting plants and other
structures have been built on top of
the spoil banks, so that If the crib
bing should be burned these buildings
would be destroyed and there would
be greater loss in the closing of the
canyon. 1t was therefore determined
to fireproof the cribbing by covering
II with mortar On the face of the
cribbing small Turing blocks were
first placed to insure that the wire
mesh would clear the face of the tim
bers, and to these blocks the wire
mesh was attached, care being taken
to cut an opening at the end of each
tie log, in order to secure compare
lively true planes. TO the wires, pro-
1ecting at these logs, We're fastened
small cap pieces of reinforcement All
of the mesh was firmly stapled to the
logs and Turing blocks. Between
the logs the voids in the back fiji
Of do Ia IL
was deemed advisable to attempt to
fill them with the cement gun, using
a mixture of four parts of sand to one
part cement, and thus obtain practic-
ally retaining wall with the face
timbers fully incased. The face was
finished off with about ga of an inch
of mortar
At Burke the gun was next used in
the construction of reservoir In a
gap about $50 feet above the level of
the portal of the lower tunnel an ex-
cavation about 26 feet in diameter
was made in the rock, Across the
outlet end concrete wall rs feet
high was built after which the up
stream face of this wall, as we'll as
the entire surface of the bowl was
covered with about 3 inches of gunite
The mixture used was one of cement
to four of sand, with an addition OF
about 10 per cent hydrated lime. No
attempt was made to obtain a smooth
surface, the rock contour being fol-
lowed. The reservoir, holding about
10000 gallons, has never shown any
leak except small one where the
outlet pipe passed through the wall
and this was probably due to the
fact that no flange was shot around
the end OF the pipe. The roof of a
rope house was next covered. This
roof was 22 feet wide and 102 feet
longand was slightly arched. Sheet
ing was nailed to rafters having 49,
inch centers and light tar paper plac-
ed on top. The 3-S-inch Turing
strips were tackled on and on these
1-inch mesh chicken netting. A one
to four mixture was shot on to a
depth of Y inches. The work was
completed in two days. Heavy rains
and IA inches of snow have developed
no leaks.
The walls and the roof of a three
story hall and club house was next
treated. This building is 70xSS feet
and So feet high. The studding con-
sisted of 2x6-inch planks spaced 16-
inch centers. On the outer face Of
these was tackled building paper and
on top Of this light tar paper. Three
eights-inch Turing strips We're then
metal hath. The walls, the coping
and the tower amounting in all to
about 10000 square feet), were shot
to thickness Of IL inches and the
concrete basement walls were given a
stucco coat, in II days. No hand
finishing whatever was done on the
walls, the entire slab being shot on
at one application. The finished sur
face approximates true plane These
walls have been completed three
months and only one small crack has
occurred. The roof of the building an
area of over 5000 square feet, was shot
to thickness of IA inches in three
days. The roof was concave. The
sections which slope to central
drainage point were arched 5 inches
to take care of expansion. The con-
struction consists of 2xS-inch planks
spaced 16-inch centers and covered
nj Ia n TO- -