The Calumet news. [volume] (Calumet, Mich.) 1907-1938, 1910-01-28
MIAMI.

The rapid development of the Miami
nronerty is accomplishing the work
arioinally planned I'm a wonderfully ex-
neditious manner, says the Globe Sill
,or Relt The large haulage-way run
r,,g I'm a straight line southeast from
,ho No / shaft to the No. 4 shaft is
.,acious enough for an ordinary four
horse team to work in. However, TINS
4, not the plan for the future. This
,,rce drift will be doubled i'm size by
tbe work now i'm progress, and electric
cars will operate through the roadway
~ tbe heart of the large ore body. The
distance traversed between these two
sbafts is about 1.i00 feet, 200 of which
10 in the ella conglomerate between
,he eastern limit of the ore-bearing
scbist and the No. shaft At inter-
walls switches will be put in To side
track the trains into crosscuts, where
tbo ore will be loaded on the cars from
chutes leading from the large rooms in
which the ore is to be mined.
The No. shaft through which all
fine ore will be hoisted to the surface
has five compartments, two of which
will be occupied by the ore compart-
mcnts are five by six feet in the clear.
ON the south side of these, the man
way will give means of egress from
the mine I'm case of accident to the
hosting machinery. Next and to the
north of the ore compartments Is To-
Gated the compartment to be used only
for the purpose of lowering timbers and
for the use of the men going in and out
of the mine. The fifth compartment
is the pipeway, through which all the
piping, electric wiring and the COM
pressed air for the drills will be admit
ted to the mine. The cage compart-
mont measures six by twelve feet and
the pipe compartment is three feet by
six feet. An the timbers are creosoted
and set i'm the most thorough and per-
mancnt way for the important purpose
for which they are to serve. The level
referred To above is at n depth of 42O
feet from the surface and will be the
extraction level for all ore below the
S7O-foot level, and possibly for that
above all Of which is to be mined by
an original method worked out and to
be first introduced at this mine. This
is called the auxiliary raise sub-level
caving and top sllcing method.
BY the new method to be employed
in the mining operations, about sixty
per cent of the ore will be mined IN
rooms and the remainder will be ex-
tracted by the top slicing and sub-level
cayng methods. The compactness and
uniformity of the ore body makes 1t
particularly adaptable to this econom-
zeal system of mining, in which a min
imum of timbering will be required.
The No. shaft is being sunk from
rapidly nearing the depth of $40 feet,
at which the second extraction level
will be established and will ultimately
form a duplicate of the 420-foot level
already described. Each ore pocket to
be cut i'm the formation at the stations
Of each of these levels will have a ca
pacity of 1000 tons of ore. The ore
VIII be dumped from the electric cars
into these pockets from which the sew
en- and one-half ton skips will be load
ed automatically. A large portion of
The ore body has already been cut into
blocks measuring 100 by so by 25 feet.
The drifts running east and west are
100 feet apart and those running at
right angles to these are being driven
at intervals of fifty feet. Raises are
being put up to a height of twenty
hVe feet, which is the distance between
The sub-levels. The main drifts are
electric-llghted and the ventilation is