The Anaconda standard. [volume] (Anaconda, Mont.) 1889-1970, 1899-08-22
At THE UPPER WORKS
Changes and improvements at
the Concentrator.
BIGSTEAM STAMPTORNOUT
Crushers and Rollers to Be Substituted
About Fifty New Jigs-Closer
Work and Greater
Capacity.

A hasty run through the concentration
of the upper works of the Anaconda
company fully confirms the Statement.
made last week relative to improve
ments being made and in concentration.
save that the Improvements are pro-
crossing more rapidly than was then
anticipated.
AS is quite generally known, locally
at least, this concentrator has been
equipped with six steam crushing
stamps. 1t was intimated last week
that the substitution of crushers was
under consideration. This matter has
now passed beyond the stage of mere
conjecture.
No. stamp, that is the one located at
the west end of the works, has already
been torn out, preparatory to the plac-
ing of a Gates crusher and two sets of
rolls in lieu Of the stamp The crusher
and the rolls are expected at any time.
and upon their arrival will at once be
put in place. No. stamp, at the east
end of the building, will be next re-
moved, and the same kind of a sub
stitution made.
The ore will pass from the crusher to
the first set of rolls, and thence to the
second set for finer work. Later the
change may be general, but upon this
point the statement is not positively
made.
1t is not clear whether this will add
to the crushing capacity or not This.
however, is not the particular end
sought, for the mill can already crush
far in excess of the concentrating ca
pacity. The main purpose is to avoid
the excessive production of slime, which
comes from the tremendous blows Of
the stamps. This slime is very difficult
to handle, and holds in solution consid-
cradle value, some of which is neces-
Sarily carried away and lost.
The concentration is now equipped
with 142 Cullom jigs and quite a number
of Hart jgs. These last named are of
smaller capacity than the Cullom. Be-
ing narrow, the feed is necessarily slow
to avoid loss. These are to be taken
out and replaced with Culoms, thus
adding considerably to the jig capacity.
Besides this. a number of settling tanks
are to be removed and the space filed
with new jigs-some Il or IA in number
thus adding still more to the Jig ca
pacity.
One of the most important works in
progress is the placing of an entirely
new set of jgs below those now in use.
Eighteen of these are already in course
of construction and the foundation work
is proceeding for IS more. The par
ticular work to be done by Hhese jigs
will be the handling of tailings from
the upper jigs after having been re-
ground. Mills for regrinding will be
placed Immediately above the new jigs.
It has not been learned what Kind of
grinding mills will be installed, but
they will probably be similar to the
Huntington or Chill mill. Possibly one
of these will be selected, but in any
event. it may be certain that the aim
will be to get the best.
The tailings to be handled in this
way are those which now go to waste,
carrying more or less of value Thus
it will be seen that the changes in con-
temptation will have the double effect
of increasing the capacity of the con-
centratOr and at the same time enable
it to do closer work. by saving some
values that have heretofore been lost.
BY this it is not to be understood
that the work has not heretofore been
good, for it is considered to have been
up to the very best standards hitherto
attained. But there is always some loss,
and the aim is ever to reach a higher
grade of excellence.
1t is not possible to state the precise
increase of capacity that will be OBJ
tanned in this way. but obviously 1t Will
be very considerable.
AS a result of the setting up Of all
these new jgs. other places must be
found for the desplaced settling tanks.
for, of course, it is impossible for them
to be dispensed with. Therefore they
the being moved, some of them, further
down in the mill, while others are lind
ing places in what is called the tank
house" or table house" below. While
these improvements are in progress.
the regular work is proceeding without
a break. except. of course, that the
stamp removed has reduced to idleness
the Immediately connecting jigs-those
which received their feed directly from
that stamp.