Eureka daily sentinel. [volume] (Eureka, Nev.) 1871-1887, 1874-09-11
furnaces of Eureka. The scum is
smelted in conjunction with picces of

pressure of blast. by this operation
the zine is, for the most part, volatilized
as oxide of zinc, which is caught i'm Il
condensation chamber attached to the
furnace; but the silver and gold remain
with the lead, which was intertningled
with the zine scum. This erich lead'
is tapped below from the furnace
hearth and laiied into molds, and is then
passed over to the cupelling.furnaces,
The Stag is not kept running conlinu.
ouslv, hut tapped at intervals.t the breast
OF the furnace being closed in the mean
while. The Stag is used owe in the ore
smelling furnaces rs Il iiuN. As another
residual product, we have zinciierous
i~ron-sows, which form a crust around
the hearth of the furnace and have to
he detached by mechanical means.
They look very much like our speiSs
or .'iron,' as it is commonly called,
and may he used in the dcsulphuriza-
ton OF yalena.
The rich lead is cupcllel in an
The English l'upcilinS
Or refining furnace. of which there are
six in the works. The bottoms leu
pels or tests of these furnaces are
made of bOne-ashes, and have an oval
shape. Before Use they are dried and
annea'ed. They rest cn two strong
iron bars in the furnace proper. At
the back wall OF the furnace there is
an opening for the blast, which is ere
ated 10y steam, and on each side of it Il
charge-hole. At the front wall there
is an opening for the discharge OF the
HtiiarSe, and sideways from the test
there is 4 fire-door. The test is placed
il, t1,a fp vy,1na il, yrta1, I, that
the plane of its long axis passes
through the en,er ofthc tweer-opcning
and the discharge.
The cupelling process is based upon
the following circumstances: If an
alloy of lead aud precious metals is
fused and then exposed to- Il current of
air, the entire lead is gradually con-
verted into oxide of or litiiarge, as it
j. generally termed, leaving finally an
alloy OF the precious metals.
The rich lead is now introduced
Though the cllargc-ho!es in the test,
bar by bar. and nitl.ed. As soon as
the test is filled up 70 the rim the blast
is turned on and the heat kept up at
the same time.
The Formation Of Lit.largc
Begins, which is partially absorbed by
the porous test-lar,ialiy drawn Off
through II gutter cut into the test on
the discharge side. Tie li:llarge is ruin
into pots mounted on wheels, AMI re-
moved when filled. As soon as the
nctal-ia;h has decreased sufficiently
i'll size % r.ch lead is introduced
INFO the cuIcl, Till it is supposed to
contain the uuan!i:y of silver desired.
The blast * continued until the bright
cnin- OF the silver has taken place,
when no m,rc litharge is rcrccplihle,
and the operation is iiniShsd. \ hole
is 10Y bored into the bottom OF the
test, and the refined metal drawn off
into mo!dS resting Oh a movable
frame. The silver bars thus obtained
are r%cnic!.el in black lead crucib,cs.
cast into ingot moldS, aSsayed, and can
,iow be sold to the banks. They are
.9aj fine. The lithargo is accumulated
for further trea nlent. Tho test is
broken up and assorted.
The Infars.i.E,eI Portions
OF it are used over again, while the
balance goes to the ore smelling fur
mace for the extraction OF the metals
il contains.
Ii row remains for us TO state briefly
what is done wiki the residual pro-
ducts. in which there is still Il good
deal oil money value hidden. The
first dross from the calcininy furnace
is liquida;ed i'll Il furnace constructed
especially for that purpose by Mr..
Weisc. the Superintendent. 1t is Il re-
verbcratory, with two bottoms,
composed of grate-bars With narrow
SjitS n,,l i. ..Iu ru,,l wtth thn l,nSS
The lower one consists of compositions,
and has Il steep pitch toward the tap
hole, in front OF which there is Il east
iron receptacle. Tho temperature is
now conducted so that the lead tr!cklcS
OF the droSs into the lower hearth,
hut leaves the balance INFUSED. This
dross is then Withdrawn and smel:ed
for coi.per-ma;te, with iron rvri;es,
which is not further treated on h
spot. The lead goe, back to the dcsil-
,eriz:nG pos.
Tilc Poor Lead Dress
Is smcltcd directly with Stag for anti
or hard lead type me,aD ina
furnace. This lead commands
Il good price. Tie litiiarce from the
cuucliin., furnaces Is revived in Il re-
v~erheia,ory furnace; that i, ii is mixed
with stone coal, exposed To Il melting
heat whereby i; is reduced to metallic
lead. As the ligIlar2e is neither very
pure nor free from silver. the resulting
lead has TO he returned TO the desilver-
ling pots.
Exclusive of the furnaces heretofore
mentioned, there are three more iur-
naces OF the ground destined for the
raw ores and hy-producis.
is an English flowing furnace, for
the production of lead bullion and
Stag Stag rich in lcad) from rich
saiena ores. The cray Stag is further
treated in one of tie two remaining
cupola n blast furnaces. | hardly
need to say that ali ores not tit for the
revcrholatOry are sIncltcd i'll the latter
with the proper iiuxeS.
The Hast Furnaces.
One of which is provided with all the
modern appliances water jackets,
receive their blast from II large
sized S.ur.evant fan propelled by Il 10
horse power engine. All the furnaces
are provided with dnst-clian,bers con
nec.ei with f!ucS, whici, run into the
main flue. the latter terminating into a
tall stack. The only fuel required at
the wOI Ks is raw stone coat for the re-
.Ne.bcra:Ory furnaces. de>ilveriZlng
pans and tho steam engine, aud coke for
the blast and assay furnaces.
Finally. | cannot tori'car to praise
the urbanity and Willingness of the
gentlemen in charge to give i%nfornia-
tion-Mr. Billing, the business man
aver, and Mr.. We!so, the Superin.nnd-
en-. II.
Fox TIE .A>sEMBLy.-Phillip Splain
is announced in this mornings SEN