The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1914-03-05
CUSTOM MILLING
PLANT FOR PARK
Crasselli Zinc Mill Is Pur-
chased by Salt Lake
People.
is TO BE REMODELED
New Concern Has Five-year
Contract for American
Flag Ores.
is TO BE REMODELED

John Pingree, president OF the Mer-
chants bank of this city. has bought the
C,rasselli zinc plant on the fiat below
Park City and II is to be remodcled and
converted into a custom mill for tho Park
CITY district. A company OF local peo-
pie is In process of formation to finance
and carry out the work planned
George H. Scibird of tho Western Ex-
ploratio company as general manager o'
the new concern. will have charge OF inc
remodellng OF the mill and its suDse-
auent operation. Tho Grasseh plant is
q we'll built and well-eQuipped dry con-
centrator representing an original invest,
meut OF about 10000. II has eood
power plant, plenty OF water, Taiiroao
spur and complete laboratory ONCE aho
other buildings.
Many changes In the mill Will OF course
be necessary. and Il IS expected inc WORK
OF making them will begin before the
end OF next week.
Crushing machinery, roastcrs and leach
Ing machinery Is TO be added, and II Is
believed this can be accomplished IN nine-
" days. The mill is Intended to handle
those ores OF the district of too low
grade TO be sent With profit TO the va,
ley smelters, and that have been round
extremely difficult to concentrate with
out q loss of values that was prohibi-
tive,
Three or four years experience and OBJ
scrvatIon in the Park city district, ana
especially with the American Flag mine.
led the Western Exploration company
people to see the need and seek So
luton OF the problem Mr.. sclbird a
metallurgical engineer, has been employed
for the last seven months an experiment
ing with the ore and investigating treat
ment methods. The first step taken In
the investigation was TO decide. once and
for all. that no process would be eonslo-
cred which had not been carried TO
.f,,l ri o-fl ar
Hence the work WAS confined TO narrow
limits. While II had been known Tor
some time that the mill ore, constantly
being added to by development. WAS pc
culiarly smenabl both physically and
chemically. To rhe new chlorination proc
ess. yet this method OF treatment was
not looked upon with favor. because II
Was until recently In sn experimental
concerned.
While a description Of this new process
tx NOT permissible at tbls time, it Is
ma tier of common Knowledge that II is
moderniza ton OF the old Augustin proc
ess. wherein the metals are converted to
chlorides and subsequently leached with
suitable solvents The process as now
perfected, has overcome the previously
existing difficulties in voletinzations low
extra ctions. and high costs. While the
management OF the American Flag was
watching the development OF the chlor-
ination process II was carefully study
ing tho results 10 be obtained by con-
ccnrration. and concentration followed by
cyanidation. Without going into detail In
regard 10 the tests. II was found that con-
centra tion alone was unsatisfa ctory, and
that recovery Of 36 per cent OF the sill .
yer. 40 per cent of the gold. and practical
" all the lead was the best that could
bo expected. \ combination Of concen-
tration and cyanidation gave final eX-
traction of % per cent OF the gold and
"a per cent Of the silver. consuming "a
pounds cyanide. Lea ching with sulphuric
l.af. Il .fk.,. ff.lr
recovery with a reasonable cyanide con-
sumption. Chlorination promises a re-
covery Of So per cent OF all the metals
at q cost Of $50 ton, and since this
method OF treatment is in practical op-
Grafton, It's adoption has been decided
upon.
As a starter for the new mill which
at the beginning is To be Of thirty tons
contract With the American Flag mine 10
furnish II thirty tons OF ore daily for
ave years. This assures the mill a profit
rom tile start and i've years business.
as tie American Flag now mas blocked
out about 200 tons of sig ore on
which the experiments above detailed
were made. IT Is the purpose to enlarge
the mill as soon as II is II demonstrate
success 10 Whatever capacity may be
called for by the demands oi the district
Tile process II practically the same az
company's MILL at Park City and the new
knlgh; mill AT Silver City. II Is con-
sidered sufficiently tried 10 be "A proven
success. There is a wide field In utan
for opera tions along this line as the tom
mage OF ores that can he handled best and
most economical lly by this process is very
large, not only In Park city. but In other
camps OF the state
The Grasselli zinc plant WAS built III
handle the Daly-Judge zinc mdJlings
bui when IA process OF separating the zinc
at the mine mill In the course OF concep-
tration was put into operation the zinc
plant Was left with nothing TO do and has
been Idle for two or three years.
Mr. Scibird L. n master OF metalIur-
Slcsl practice and an expert In the tech
meal bra anches OF mining science He
has had wide practical experience hav-
ing managed mills at De Lamar, Fair
view and Wonder. New. and made a con-
spicuous success OF each