The Caldwell tribune. [volume] (Caldwell, Idaho Territory [Idaho]) 1883-1928, 1898-08-20
4 DC oYANlpr pLANr-
remarkable Undertaking Begun a. Ms,.
cur, Utah.

ceeu-
AT Mereur, Utah, has begun onara.
non OF what in many ways e tbo
most remarkable cyanide plant on fLe
continent, says the Mining ana Scian.
Ilne Press. About $1,5O0 600 has hnan
expended on mine and machinerv
reference is made to the Golden Gafa
mn at the mine of the same name. et
mar. " - ~ ne Id.
otah is land Of marvels. and mas
oIten set at defiance lone-accepted
tenets' The finding of gold in coal. tho
discovery OF silver in sandstone. and
the production at Mercur of gold ora
III winch there is not trace Of silvsr,
are among the singularities. Ordiner.
Ivy gold bullion contains about 10 nor
cent silver. A remarkable feature NJ
some Mercur gold ore is the total nh
sence of silver. The district was firsr
| silver producer, free-milIing cblor-
lue, soon exhausted; then clnnabar
was ulscoYered in an everything vein;
Iasty gold. Many thousand dollars
were lost In abortiVe attempts at pan
inauguration at the Mercur mine.
winch only secured 10 per cent. of the
gold' when, in 80, the cyanide BRO.
cess was tried and found successful
Al the Mercur, Marion and Geysar
mines this process was profitable, with
a use OF one-half pound Of cyanide per
Ton OF ore. Sulphides and arsenical
ores IN the Golden Gate property and
the group by which it is surrounded
occasloned experimental work lasting
TOT many months, which has resulted
IN the building of the biggest institu-
tlon OF the kind in the country.
Inc site covers an area 3OOx4OO feet:
In the foundation is cemented 5000
tons OF masonry, terraced till. were II
reared perpendicularly, the height
would be 300 feet above the earth.
The mill building, of STEEL is 100 feet
from the lowest to the highest floor
level, and is $50 feet long by 295 wide.
On the top or upper level is a Gates
! crusher, 25X15 feet. The ore is raised
through an incline which starts from
the working shaft about sixty feet be-
low the surface, and passing ND under
a corner of the mill, is automatically
dumped into the coarse crushers and
run into bins holding 1000 tons. The
dryer on second level rests upon solid
masonry forty feet thick, with a floor
space 75XS2 feet; from this the ore
passes TO the third level, where are
| placed the rolls, screens and elevators
and where it is finely crushed aud
screened, thence going to 25xS4- foot
ore bins, also Of 1000 tons capacity
! Under this latter ore bin is a dust
chamber 11x1O0 feet, directly connect.
ed with the main flue and provided
with eight hOppers.
From the second set of bins the sui
! phides and arsenical ore discharge
into two Brown drying furnaces, re,
| verberatOry, hearths 12x60 feet, fired
by gas, on the fourth and fifth levels
The siliciOus ore goes directly from the
storage bins without roasting. The
sixth level is reserved for additiona,
surface space. On the seventh level Is
the Teaching department" 29Sx6(
feet, ten solution tanks, each Of 20t
tons capacity, into which the ore from
/ tunnel the fifth and sixth levels is
discharged. On the eighth level art
the precipitation tanks, charged will
zinc shavings.
South of the fourth level is a gas
producing plant Boxes feet. The gas
is used for roasting and drying, and
it is claimed, effects a saving Of z
per cent. in the fuel bill. Eleven dyna
mos of a combined capacity of Coz
horse power furnish power.
In the mine considerable develop
ment work has been done during tn,
last three years, and the men say al
enormous amount of So ore is blocked
out. In mining the cavern system wa
adopted-a drift run under the or
body along the foOtwall, timbereC
| Just enough for safety, the ore thel
divided into blocks, every other bloct
being left standing as support to tn
hanging wall, the remaining block
mined out and the pillars then broker
down. To do this a second drift is rul
along the hanging wall, the ore pillar
loosened, gravitating toward the out
let.
HnrfvFIIa Tpoo Ore.