Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1907-08-27
METALLURGY Of
yER|NGTON ORE
Engineer E. P. Jennings Com
pIetes Series Of Experiments
And Makes His Report.
NEVADA DOUGLAS ORE USED.
Treatment Not Difficult Proposition
Ore Resembles That in
CRANKY Mine.

The matter Of ascertaining the best
method, or process. for the treatment of
the copper ores from the Yerlngton,
Nevada. copper district. has been given
attention by E. p. Jennings, the min
ing and metallurgical engineer of this
city. He has conducted a series of
experiments on ore sent him from the
Nevada Douglas Copper company's
properties, and which includes the Lud
wig mine from which high grade ore Is
now being shipped TO the local smelt-
ers
The ores entering into the expert
tnents We're classified into seven parts,
ta) being sulphides In garnet gangue
and carrying values above . per cent
copper, (b) the same ore. but running
under per cent copper (c) oXidized
ore, assaying from l to 10 per cent cop
Per; (d) oNidized ore with lime-iron
gangue, assaying from 3 to 10 per cent
copper The ore designated (e), 90
and (R) came from the Ludwig mines,
(e) being oXidized ore assaying from
10 to 20 per cent copper: % oXidized
and sulphIdes, assaying from 10 to 20
per cent copper and (g) sulphides of
iron assaying from l to 4 per cent cop
per.
Mr. Jennings report was placed in the
hands OF General Manager Walter G.
Orem several days ago and from It
II has been ascertaIned that classes b
and will require preliminary concen-
tration before smelling. class ''b" cam
not be concentrated by ordinary water
concentration, but from experiments
made at the Blue Stone mine with sim
ilar ore.a system of magnetic concentra-
ton has been devised which gives sat-
isfactory results. Their method con-
sists IN giving the crushed ore light
roast to render the mineral magnetic
and treating this roasted product on
Witherell magnetic operators. A sam
pie of garnet sulphde ore from the
Douglas has been sent to Denver for
treatment by the new Gilmore vacuum
proceas. 1t is thought that this meth
cd win prove successful on this class
of ore, but nothing definite can be
said until returns are received from
Denver.
Glass g-Iron and copper sulphides
in silicious gangue. can be concen-
trated by the ordinary methods. The
concentrates obtained by any method
can be smelted either in oil fired re-
Verbatories or briquetted and smelted,
together with other ores in blast fur
naces. The relative cost of oil and
coke, the amount of flue dust formed
and Stag and smelling losses win de-
termine which is the most feasible. 1t
can ne sAlu mere tIlstt II iifEt diIiouiil
OF the Nevada Douglas ore Will come
under the head of concentrating ore.
Glass d--Low grade oxided ore In
garnet gangue. This constitutes an
area of surface that has been esti-
mated to amount to 100000 square
feet and is from 10 to 40 feet in thick
ness, forming the overburden covering
the sulphide ores, The best of this
can be smelted with suitable pro-
norton of sulphide ore.
George L. Walker, the Boston copper
authority and editor, who made an eN-
animation of the CRANKY mine in
British Columbia during his late west
ern trip and who also later visited the
Nevada Douglas made the statement
that the ore produced from the two
mines was very similar and that tine
CRANKY people were able to smelt It
at an expense of about $40 a ton. He
was OF the opinion that the Nevada
Douglas ore could be handled as
pheanlV