Yerington times. [volume] (Yerington, Nev.) 1907-1932, 1916-12-23

metallurgy during the year has been
the perfection of a leaching plaat
which uses the fumes from roasted
sulphidc ores to leach tie sam cores
and as we'll as larger tonnage oi
carbon.te ores. This has been nc
conplished by the Nevada Dough- S
Consolidated Copper Company IN the
Yerington Mining District, Lyon
county, Nevada. Besides this tile
company has shipped considerable ore
during the year, and did 4 large
amount OF development work. In
many ways the year closes as one OF
the most successful in tie history OF
the company. 1t is expected tha. the
cost when operating the plant ON Ne
vada Douglas low grade ores VIII DC
8 cents pound Tor copper.
During the past year ne" ieaeii
ing process (Patent @,5zI) mas been
tested and perfected 1t the proper
OF the Nevada Douglas Consolidated
Copper Company. Special equipineti.,,
has been developed to Adequately hli
the requirements of the process, anu
the usual difficulties incident to tAe
treatment have been met and over
come. ,.i
A description of the process shout
,e of oecu;iar interest to those local.
tiee where the properties OF sulphur
ors smelter smoke is subject OF con
tention between farmers and sIaeitsl
owners. for the reagent used III tHe
| treatment of Nevada Douglas ores J.
the smoke from roasting furnaces.
trsct its copper contents, and Whiie
Roth sulphide an doxidized ores are
treated at the plant. The sulphlde
ore however, has a double value, tol
after roasting, it is leached to ex-
tract its copper contents, ana WIN.
roasting it supplies the essehtiai
teaching reagent necessary In the eN-
traction of copper from all prouuet
or oxidized ores treated at the pidht
The oxidized ore crushed TO pas;
through one-half-inch screen aho
screened so that the ore is separated
into coarse" material and hnes,
which pass through ten mesh screen.
The sulphide ore is crushed ant
oround to 90 mesh. This is con-
veyed to Wedge furnaces, an dgiVen d
sweet roast. Ten to fifteen per cent
of the ore is busted by the stirring oi
the rabbles, and carried through con
stricted fues directly into the Inse
treatment chambers. lhe rest ol ,,i'
roast is worked down through the
furnaces, discharges to a pan con,
vevor and delivers the material lito
a stir tank supplied with water.
sand pump is connected with the t'hk
and pumps the mixture OF pup anu
water to the fines" treatment oi ao
sorption chambers.
Since one ton of sulphide ore con-
tanning ~ per cent o 1suiPhu' W.
treat three tons OF oNidized ole
s,des the roasted material, with tne
nnmp mixture pumped From the All
tank. -, -, r,,se ;s
then caused to spray or ram thiousi
not roasted fumes, winch are ui""
from the furnace sand passedthrousH
the absorption chambers, ,,
The leached material discha's'
from the absorption chambers passe:
to classiher. which separates ana
shes the sands and discharges the
.nmes TO Trent displacement tanks
sl;mes to Trent displacement TANKS
The sands discharge to the faiis l"ot
and the sdimes, after displacement oi
me accompanying rich solution ar'
also discharged. ,,
The coarse oxidized ore is deliVere'
from the mill to a conveyor. VIM
discharges by means OF tr1pper Z
the sulphurizing tanks. The ore i
then leached in place by means oil
fumes discharged from the absorp'
ton tanks, or by fumes diverted from
the roasters, by process (Patent
applied for) similar in chemical action
to that occurring in the fines
chamber.
The copper solutions arising from
the ore treatment are collected in
large stock tank. filtered and pumped
to the precipitation system where the
copper is precipitated on iron and
finally recovered as a product con
tanning about 80 per cent copper.
Eventually the company expects to
use an electrolytic method of deposi-
,npoId ol pue 'asddoo 9q@ 10 uo!l
electrolytic copper.
In resume the company has prac
tically completed in 1916 modern
250-ton mill, and perfected a leach
ing process which permits the effec-
tive use of what is probably the
che.pest of all solvent aeents-inci
dentally it has developed smoke
conservation process
Practically complete utilization OF