The Pioche record. [volume] (Pioche, Nev.) 1908-1925, 1916-09-15

A recent issue. of the Salt Lake
Mining Review contains tie follow
ing description of the Bullionville
mill of the Prince Consolidated Min
ing & Smelling company, which wa:
written by C. f. Sherwood, late met
allurgical engineer for the Prince
company:
The mill just completed for Ihe
Prince Consolidated Mining & Smelt-
ing Company for the treatment OF
the Bullionville and Dry Vallev tail
ings is located half mile from .he
station of Papaca, Nevada, On the
Phoebe branch of the Los Angeles a
Salt Lake railroad. The mill is To-
Gated on the site of the OH sme!ter
at the former camp of Bullionville,
which at one time had population
of over 5000.
"The tailings which this mill is
designed to treat are approximately
forty years old, being the result of
old milling practices on the earlier
ores from the Phoebe district. rkey
have most of them been retrea.eJ
by pan amalgamation and cyand,za-
tion
'The Dry Valley tailings, which
are identical with the Bulliony,iie
tailings, are shipped by rail from
Dry Valley to the mill at Bullionvil!c
All these tailings are highly silicious
and oxidized entirely, containing the
following values: Lead, 50 per cent,
silver, IL ounces; gold, $14O.
''The lead occurs entirely as car.
Donate and the silver practically all
as a chloride; consequently any
method of gravity concentration
would give an extremely low recov-
cry of metallic contents. The method
best found from a metallurgical
standpoint is the artificial filming or
sIiphidizing of the lead carbonate
with a sulphide film. The principle
ci changing the exterior of the min
era. particle from the carbonate 70
tae sulphide state is not new, It Law
ing oeen done years ago in the ell.
deAvor to render magnetic non-laa~-
netic mineral Many reagents wee
tried TO effect this sulphidizatlon but
| - nf In, IL ny
ing agent was f,.,-hd to be the be /
The Nil! Flow.
''The followiis ic a description pl
the flow throlyh the mill lie Caii
ings the ele-at a }pAipfoot
thickener at tao read OF the mil
from the pit bT Il two-inc, ccm-
pound sand ald slime pump The
t'ickener is ins al.ed at this point t.
act as a regul,In on the feea "a ;lt
nill The uNLcreow from the thick
ehel enters a 5Xl6-foot tupe MIL
{. staining hcll load of six toss
manganoid spheres In eXpe' iarrtal
work it was found not necessary to
rpgrind, but the s.ction of the tube
mill was beneficial in polishing the
mineral facets . ,',r to the addit!oH
tf sodium sI.3h L. The discharge
of the tube mill flows to two 14x6
foot underfed ns'tetors. These sgi
tators have proVen unsatisfict,T
ou,inu RI tha op,nnrt pf aOf in fanf
and are being replaced with mechan
ical agitators. A stream of sod IN
. sulphide solution IS added to th
Pulp at the point of it's diachare'
| from the tube mill. The pulp - sub
jected from the agitators to the Su,
9 phidizing action for at leasg thirt
Y minutes, flowing from there TO a.
t elevator where the necessary oi. 70
: citation is added. The elevators lis
| charge into two Axis " foot Pachuc
y tanks, operating under an air pres
f sure of thirty pounds. The pulp an
r oil are thoroughly emulsified in tn
0 pachucas, which discharge directl
e into series of six pneumatic rolig,
il ing cells. The concentrates frel
n these cells are broken down by watt
l. spray and belt elevator and al
) cleaned in one cleaning cell. T
W .a,l ngs from the cleaner are retur
J. ed to the feed to the pachucas. TT
J. &c entrates are thickened in 81
n teen foot thickener and sent to q
f Sx6toot continuous filter.
Tailings From Roughers,
"The tailings from. tha-sfoughr
'r oLerations are classified in c!ass
fer, the slime overflow Of the class