Gilpin observer., 1917-04-12

The Evergreen mine in Apex is in
better Gre ~and larger bodies, 1t is
safe to say. than at any time in it's
history. This was learned by an at
taohe of the Observer who visited
the mine and mill yesterday and took
in the situation from beginning to
end. And it may be further stated
that the outlook for this proposition
of the values in the ore was never
more encouraging OF certain of prof
liable results.
Wcrk in the mine at present is
being carried on in the 100-foct lev
ell, where machines are breaking ore
in stope 65 feet long and from II
to 20 feet wide. This ore is of
splendid milling grade with big bun1 h
es of bomite and chalcopyrite. This
bornite is among the dghest found
anywhere, running as high as $50
in copper and As ozs. in silver. 1t is
separated frCm the milling ore and
shipped direct to the smelter and is
new being accumulated for a carload
shipment. The Evergreen mine is
only $50 feet deep. Between 500 and
800 feet of drifting has been done on
the 20O-foot level, 400 feet on the
10Ofoot level and 1926 feet on the $50
foot level. No storing has been done
in the 35O-foot level but there are
three slopes in the 200sfoot level. The
showing in the 35O-foot level is
| great, the ore bodies that have been
cut in drifting being more extensive
than ON the levels above. The ore
reserves in the mine at the present
time are sufficient to keep the mill
going for two years.
Since the mill was modernized and
made over into a complete flotation
plant the saving being made is very
gratifying, the recovery being better
than 900. This is saving of 209o
over the old system of straight con-
centration and Card tables used in
the mill before flotaeion was adopt
ed. 1t is hoped that with little
perfection in the system to bring the
recovery up to 81 or 96%.
} The ore is treated automatically
and is not handled after 1t leaves
the crusher until 1t is received into
the drying bin finished product.
The ore is run from the mine to the
lv,,i1 To- i1,tn n
receiving hin that holds IT'S tons.
From here il gees through the crush
er and is reduced to about an inch
in size. 1t is then dropped into a
bin that will hold about 200 tons. To-
Gated just. above the rolls. From
here 1t is fed automatically into the
coarse rclls and then passes through
trommel, the coarser product GO
ing to another set Of rolls for finei
grinding and the screen product to
: the tube mill. The ore from the sec
ond rolls is elevated to the tube
mill. After passing through the tube
mill the product that is ground from
40 to 60 mesh goes to the mixing
: tank and the coarser stuff is carried
back to the tube mill for re-grinding
l After leaving the mixing tank the
I product goes direct to the flotatior
e machines where the metallics raised
a by the froth are carried to the filter
ing bin and from there into the dryini
a room, finished product ready foi
the smelter. There is now a CARLOAD
0 of concentrates in the drying room
S awaiting shipment. The mill machir
0 cry is run by three motors, one 2'
r h. p., one 40 and one so.
d There are 300 tons OF ore on thu
4 dump ready to be sorted out as sooi
I as the wealth her moderates, which will
l. be put through the mill. 1t IL th'