The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1899-06-05

Thomas Kearns, vice president and
general manager of the Silver King
Mining company, has been quite lib
eral in providing first-class equipment
and it is largely due to his foresight
and experience that the present COM
plete condition has been attained. Dur
| ing the process of construction sonre
| valuable suggestion were contributed
| by W. c. Lamb, the secretary, who is
a practical mill man. The mill is now
| in charge of j. Breckenridge Fleming,
who formerly was superintendent of the
mills of the Horn Silver and Austin
mining companies at Austin, New.
Mr.. Fleming took charge of the Sill
yer King mill in January last, having
succeeded Andrew Wallace as construc-
| ton engineer and has completed 1t in
highly satisfactory manner to the
company. 1t was started in operation
May IL and is already doing first-class
work. Mr.. Fleming remains with the
company as superintendent of the mill.
Dimensions of Building.
The building is $50 feet wide and 1s4
feet deep, while the vertical height
from the lowest floor to the highest
point is 1870 feet Nine floors in sue
cessive graduations rise one above an
other to the top. Commencing at the
| bottom the dimensions of the floors and
the machinery occupying them are as
| follows: ID Canvas tables, 60X7O feet;
| o. Tables and vanners, 60x60 feet; CD
Huntington mills, 12x60 feet; "a Fin
ishing rolls, 34x60 feet; 90 Jigs, 40x6O
feet: (6) Roughing rolls, 16X60 feet; ID
Crushers, 22x60 feet; 80 Ore bin, 25xls0
feet: 90 tramway. On different floors
are located an engine room, 4Ox4O feet;
boiler room, i0x50 feet: machine shop,
30x40 feet. Ample fire protection Is
provided by hydrant pressure of 200
pounds. Three hydrant houses are To-
Gated back of the mill, inside of which
are scattered eight plugs and LOO feet
of hose. On different floor levels are
two water tanks, each with capacity
of $4,000 gallons.
The ore is carried from the shaft In
cars on a tramway, 900 feet in length,
to the ore bin, which extends from the
top of the mill in the direction of the
hosting works. The bin is an immense
affair. with measurements 125 feet in
length, 25 feet in width and 40 feet in
depth, affording a capaciay of $500 tons
of ore 1t is substantially built of tim
Der and rests on a firm stone founda-
ton three feet thick. There are TWEEN
ty-one chute gates to drop the ore into
cars, which carry it to the crushers.
The equipment is completed with cleo
trio light and steam heat and in every
respect it is a safe assertion that no
better ore bin has ever been construct
ed. On the same floor also is provision
for two supply store rooms, each 2ox5O
feet.
After having been taken from the ore
bin in cars, the ore is weighed and then
dumped onto the grizzlies, from which
it is discharged into a bin of $50 tons
capacity, feeding into two sets of Cor
nish rolls. Before entering the rolls, |
l,<x flza frnv ba h in,
through a revolving screen, with one
half-inch perforations, and fed by an
automatic feeder. Everything over one |
half inch in size passes through the |
rolls and into a vertical elevator, into |
which also passes the ore under one
half inch, which falls through the
screen. Altogether the ore is carried |
by the elevator to a height of forty |
feet and discharged into a series of |
four revolving screens. the coarsest of !
which is perforated with one-half-inch (
holes and supplies the feed for the /
coarsest jigs. The under-size ore goes |
to screens with five-six /
teenth, three-sixteenth and one
twelfth-inch perforations. supplying the
feed for the successive rows of jigs ac-
cording to the fineness of the ore. Sixty
per cent of the ore is in such small
particles that it is not required to
pass through the rolls. 1t being the
function of the first screen to make this
If any of the ore passes
the rolls above one-half inch
in size into the series of screens, it is
returned to the rolls for finishing Thus
the ore, after passing through the
screens, according to its fineness enters
different jigs, which treat four different
sizes of pulp and are continued in mo-
ton in strokes varying from 125 to $50
per minutes. the jigs containing the
ore moving slowest. Summing
up, there are sixteen jigs of the Hartz
type, double compartment, each of
which is provided with side discharges;
ten revolving screens. each 36x72 inches;
two vertical elevators. which, by the
way. are the only ones of this type
used in the camp, and they are doing
pretty work. In this part of the mill
the stone foundations required to sup
port the machinery are very heavy.
That under the ore bin, which feeds the
is forty feet long, fifteen feet
nigh and five feet thick, while under
The rolls it is twenty feet long, six feet
nigh and five feet thick. The automatic
sampler. which takes a sample of ore
IF the lip of the feeder to the crusher
every thirty minutes, must not be over
ooked. The sample is delivered into an
,re bin. which feeds into a small Blake
'rusher OF laboratory size, and from
mere through an automatic sampler.
which reduces the amount to a size re-