Gilpin observer., 1917-06-28
EVERGREEN COMPANY INCREASING
THE CAPACITY OF THEIR MILL
Will Be Able to Treat 100 Tons Of Ore "a Day
and Make High Saving Of Values With
Complete Flotation Process

Durtrg the rast month, the Ever
green Mines company, operacirg min
ing property covering wide expanse
Of territory in the vicinity Of Apex,
in the Pine Greek section, has been
enlarging and simplifying It's mill to
increase The caracity to 100 tons of
ore every "a hours. The work is be-
ing done under the direction and su-
pervision of Shad Reid, superintend-
ent, and ]. H. Alrenfels, construction
engineer. The plans were designed
and drawn by Alfred w. Pick, me-
ohanical engineer, of Denver. When
finished the plant will represent the
ccmpleteet and mcst modern flota-
tion system in the state. 1t is not
an experimental process for the ores
of the Evergreen mine, but a treat
ment system that has been proven
practical by the smaller mill that It
displaces. The idea is not new, al
though in general design and opera
ton, efficiency is increased with the
increase Ii the quantity Of the ore
the mill will be able to handle. Mr..
Pick designed the crushing system
of the Inspiration min near Globe,
Arizona, the most modern large mill
that has been built to use the flOta-
tipn process, and owing to the COM
p1ete success of this plant the Ever
green mill was designed along the
same lines. One of the principal i'm
provements in the Evergreen mill is
the Marcy bali mill, one Of the great
est ore grinding machines ever used
in a flotation plant.
The operation of the mill will be
automatic frCm the time the ore en-
ters the min until 1t is reduced to q
commercial product. AS the ere Is
into storage bins that hold ITS tons.
From these bins the ore passes
through the crueher and from here
is elevated to the inside ore bin in
front Of the Marcy mill and goes d.
rect into the Marcy mill. from the
mill to a Dorr clasedfier and the MIN
us 4S mesh from the classtfier is ele-
waited to the flotatiCn max hines ON
the second floor. The coarser pro-
duct from the claseifier passes back
into the Marcy mill for regrinding.,
From the flotation machines the tail-
ings are elevated to a Dor thdcken-
er and from the Dorr thickener onto
Card ribot tables. The overflow Of
oil and water from the Dorr thicken-
er goes by gravity to a storage tank
and from the storage tank into the
circuit back to the Marcy mill. The
matallics pass from the flOtaticn ma
chimes into the filtering bins and at
ter dewateriDg go into the drying
room and are then ready for market
ing to the smelter.
The Denver Engineering Works
bali mill that was in use Is also be-
ing placed in close circuit with the
1t can be thrown in later to increase
the tonnage capacity to $50 a day.
Arrangements are also being made to
put in another Marcy mill II desired
and bring the grinding capacity Of
tho present milling unit up to a max
imum Of 300 tons a day. The rolls
and trcmmels used before enlargtng
the mill and installing the Marcy ma.
chime will be discarded as they are
no longer needed. Completion Of the
new plant has been delayed owing
to the non-ardval OF the Marcy mill.
but ore will be crushed within two
weeks after the arrival Of this ma
chinery.
WITH the price OF copper high and
every Indie alton that this metal will
be In Zig demand for years. the Ev.