The Anaconda standard., 1899-12-19
NEARLY READY TO START
New Machinery in The Upper
Concetrator.
NEW WEST END SECTION
Gates Crusher and Rolls Ready Only
Waiting for Completion OF the Jgs.
Chilian Mill at Work-The
Round Tables.

The keen, frosty air on the outside is
not interfering in the slightest with the
work progressing within the upper
concentration of the Anaconda company.
Five of the big stamps are pounding
away and the jigs that have not been
are in steady operation.
The new work is proceeding splendid
ly. The Gates crusher is ready to start,
all necessary connections having been
made. The same is true of the two sets
of rolls upon the floor below, but they
have not yet been set in motion, main
ly because the new jigs which are to
take their feed from the crusher and
rolls are not quite ready.
The west end of the mill has been al
most completely remodeled Upon the
lower floor are the nine sets of new two
step jigs, and above these, extending
right up, story after story, to the rolls
and crusher the old jigs have been torn
out the width of four sets and replaced
by new ones.
On the floor Immediately above the
nine referred to, are eight more of the
same class in two banks, making a
frontage of four. Still higher up are
four more. These are also two-step
jigs. Back of these upon the same floor
with the rolls are four more singles.
These last are coarse jigs, designed to
handle what is called the half-inch
material. They are fed partly by ele-
vator from below and partly directly
from the dumps above, some of the ore
being fine enough to go Immediately
to these jigs.
fDp laroe frop,,no1 bac bae, in
stalled just back Of the crusher. The
trommel, as is generally known here
abouts is a screen made in the form
of a cylinder Those in these works
may properly enough be called triple
cylindrical trommels. That is, they
consist of three cylindrical screens of
different sizes. the largest inclosing the
other two and the smallest being the
inner one of all This also has the
coarsest mesh, receiving the first feed
from the crusher. The finer material
passes through to the next outer one,
and so on to the last, which is the fin
est of the three.
The west section referred to is essen
TALLY new throughout, and may be re-
lied upon to do splendid work.
In the east end the nine sets of new
jigs are all ready. Four of
them are at work receiving the ground
material from one of the new Cihilian
mills, which is now whirling steadily.
The other five have been started for
the purpose Of testing the machinery.
So also has the second Gillian mill,
which is to feed them. Some trivial fin
ishing touches are to be put upon the
mill, and then the regular work will
begin.
Besides the complete overhauing in
parts. repairs have been made through
out the entire mill. New floors have
been laid, new jigs have been built.
old ones have been repaired, stairs
have been set up and new sluice boxes
put in at different points. Very soon
the west end section will be in perfect
running order and then a fair test may
be made of the relative efficiency of
stamps and rolls.
This concentrator still has y double
deck round tables in operation. While
the round table is being supplanted to
a large extent by Wilfleys, the opinion
prevails that for certain class of the
work the round table is still valuable
part of a concentrator. 1t will not save
so closely as the Wilfey, but is said to
make coarse savings more rapidly.
Thus it catches a considerable part of
the values very quickly, While the
shines still carrying some value. are
passed on to the Wilfleys for closer
work Whether this is better than to
have an adequate number of W!lfeys
and do the whole thing at a single
operation is matter for practical mill
men to decide.