The diamond drill. (Crystal Falls, Iron County, Mich.) 1887-1996, 1919-08-02

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| These were some OF the difficulties
confronting the Foundation Company
when they came to the property They
installed their equipment, first build
ing pentice In the shaft at the IS
foot point, or water level, OF con-
crete. II is supported by large tim
Der Orders. Through this seal cap
the opening for the locks was left.
tie locks installed and when all was
ready they put on the pressure and
drove the water back into the sand.
Workmen who follow working un-
der pressure" commonly known as
sand hogs were brought to Iron
River and set at work, first sinking
In the ledge distance OF seven feet
The rock Is what is known as "black
rock" form Of iron formation found
very frequently in the Iron River
district IL Is comparatively close
grained rock and imperyious to wa
ter.
The sink in the rock was tapered
out SO that when the work was com
pleted the rock portion OF the sink
took the shape OF one end OF thread
spool. This opening was filled with
concrete out as far as the inside lines
OF the proposed shaft opening aud
then carried up so that when the con-
GREETING was completed the concrete
represented a spool with one end cut
off and stood on end. the hole In the
center representing the shaft opening
and the tapering fiange end on the
bottom the end in the rock.
II can thus be seen that the shaft
would be not only sealed against the
water in the overburden, but that II
would be sealed in such manner
that the pressure is exerted downward
instead OF laterally as would be the
case II straight pipe OF cement was
carried up with the bottom end the
same thickness as the top.
This insures the mine from the eff
fects OF the water pressure after the
sinking of the shaft is started below
the junction point and as all the wa
ter is contained in the sand. II eff
fectually shuts off the water from |
entering the shaft openings at any |
point along the 91-feet OF shaft in the |
overburden or at the junction point |
which is the most vulnerable one in |
all shafts for water flows
Company Completed Work.
The Foundation Company carried
the cement seven feet above above the
junction point and then turned the
work over to the mining company,
but arranged to leave their apparatus
on the ground for use.
Mr. Dun and his assistant. Mr.
Murray Riedel. then continued The
work up to the surface
the work being done under pressure
all OF the way
The scaling of shaft OF the kind
Is tedious and expensive operation
First the cracks are sealed up with
okum and clay and then "whitewash.
ed" with thin concrete In order ia
get the proper clay carloads OF brick
clay were shipped from Chicago Ad-
litional clay was procured from
Mansfield.
Then the reinforcement steel was
,ut in place and wired in. Owing to
he great burden that will be upon
his piece OF concerto the reinforce
nent is extraordinarily heavy
Next the concrete was poured in
m left to set. and the greaest care
ad TO be exercised with the concret-
ng work, both In the examining OF
materials and jointing 50 that the
iost perfect wall might be secured
Concrete Completed Tuesday.
The work Of concreting was com,
leted last Tuesday and the shaft
ialls are now curing under pressui e
.fter they are thoroughly cured the
entice at the top viii be removed,
ne pumps installed and the work OF
hiking started.
AS the rock makes but little wa
'r, the operators expect TO have lit
e interferences from that source In
ia sinking and ooa,tn,, -. -