Tonopah daily bonanza. [volume] (Tonopah, Nev.) 1906-1929, 1908-02-02
COPPER PRODUCED;
What IT'S FROM

OF the 917 ,S05,6S2 pounds of
copper produced in 1906 by the
smelters, 15,132,562 pounds were
derived from the re-treatment of
materials which had been subjected
to reduction in previous years
old slags, tailings fur
mace Innings and the cleanings from
old smelter sites. OF the 404,4
tons Of this material, great part
was slags and tailings; consequent
ly of low grade and capable Of
treatment only because of metal
lurgical advantages. The average
yield from this old material was
about Is per cent. The remainder
of the smelter output, 902,673,13o
pounds copper was the yield from
about 19,743,OO0 tons of ore, the
average yield per ton being about 43
pounds, or 2.15 per cent. The L.
100000 tons ore mined and treated
primarily for values other than cop
per, furnished very considerable
portion of the total copper produc-
ton If these ores are left out OF
consideration, the yield of the 49,
900, 900 tons of ore mined expressly
for copper was close to so pounds
per ton, or 2.5 per cent. The ma
tive copper ores of Michigan, which
in 1906 yielded an average of about
70 pounds per ton, or $3.50 per cent.
Copper ores yielded 271,197 oun-
ces gold, and 15,880,S70 silver, ac-
cording to mine reports of 1906.
This is an average yield for the 49,
| 600 900 tons of copper ores of about
IO.O15 ounces of gold, and O.SS2
ounces silver per ton. II the Micni-
gan ores that do not carry silver,
amounting to about 100000 tons,
are excluded from this calculation,
the copper ores which actually con-
Gained precious metals yielded an
| average of about 0.027 ounces gold
and 1883 ounces silver per ton.
pyrite smelling, which has grown
rapidly in recent years. owing moi
only to metallurgical advantages, oui
to the marked increase in mining o.
pyritic copper ores, offers, because o.
its high requirement of silica lux
an advantageous method of treat
ment for these silicious gold ane
silver ores which require or permi'
smelling, Copper is thus fast re
placing lead as a collector OF th'
precious metals in the smelling o
bry ores. In consequence the gol'
aud silver product of all domestic
ores treated in copper smelters wa
considerable in excess of the yielt
from the copper ores alone. mi
product in 1906, according to DAFT
, partially incomplete, was gold, 4s4,
1000 ounces; silver. 21,1lO,OO'
.. ounces. The 100000 tons o
other than copper ores which wer
smelted in copper furnaces furnish
ed by difference, about 213,00
!. ounces gold, and 5,226,000 ounce
silver. an average of 0.125 ounce
gold, and 1907 ounces silver per to
"a decidedly higher average tina
that of the copper ores.
All this gold and silver was recoN
;, cred as such only on electrolytic re
= fining of the pig copper. A part G
4, the output of the Morenci. Meta
:, and Bisbee districts N Arizona, an
~ of the Dutchtown district in Tel
nessee, and small quantities fro'
F, California, New Mexico, and Nil
e souri, are too low in precious meta
II to make the electrolytic refining {
! this copper profitable. With thes
d exceptions, practically all the bli
n ter copper OF the country as we'll
* noteworthy proportion lover
70 per cent? OF Lake copper. is SUI
4 ject to this separation by electr'
n lysis. In all. about 6G9 100000
4. pounds domestic copper carryir
" gold aud silver and requiring ele
IL trolytic refining. were produced
~ 1906. Ores containing suficiel