The Salt Lake herald. [volume] (Salt Lake City [Utah]) 1870-1909, 1908-01-28

and shows how the business is being
handled in a lucid and gratifying way.
The feature that will appeal to those
interested in the company, and partic-
ularly the investing public which has
taken so kindly to the stock of the cor
pOration, is the report of General Man
ager ID. c. lacking. In it nothing is
overlooked and to make clear all that
is said, many pages of handsome half
tone Illustrations and maps of the
property are submitted.
AS the fiscal year of the company
ends with June instead of December,
and as the new milling plant at Car
field did not go into commission until
after the end of the last fiscal year,
Mr.. lacking had to informally call at
tention to some features of the COM
pany's operations that could not be
/ otherwise touched. The company has
decided to make its fiscal year end with
the calendar year hereafter, so there
will be no other report issued until a
year from now, and it will cover a
period of eighteen months. ThisNchange
was made so that reports could be
brought practically up to date for the
annual meetings. General Manager
Jackling's report in full is as follows:
Mine Developments.
The mine has been developed by ap-
proximately $4,000 feet OF underground
| workings. Very little underground deVel-
! opment has been done since Jan. ], lSJi,
| as the ore bodies at that time were
I blocked out for many years in advance,
and it was, therefore. thought best to
| confine expenditures to the removal of
OXydized overburden. The accompanying
map shows only the more important un-
| dergTOund workings, as all of them could
not be shown without cOmplicaCng map
drawn on so small a scale.
The ore bodies of the property consist
Of an altered siliciOuS porphyry, contain
/ ing small grains of copper minerals, very
uniformly disseminated throughout the
mass, both in fracture seams and in the
| body of the rock, and average about
| per cent copper, 10 OF an ounce silver
| and .0l5 of an ounce gold the primary
copper mineral is chalcOpyrite, but as a
result of OXidiZation of this mineral and
| secondary deposition of others, practical
! " all of the suphide minerals of copper
are now present, the predominating one
| being chalcOcite. The developed and par
| TALLY developed area, as shown by accom-
panying map, covers Seventy-twO acres of
ground About sixty of the Seventy-twO
acres contain mineraliZed pOTphyry of the
average value above stated. The remain
ing twelve acres average somewhat low
er, probably not much in excess of 10
per cent The average thickness of the
ere body over this seventy-two acres has
not vet been fully demonstrated by de
velopment, but existing developments in
dictate an average depth of about 80 feet,
which is equivalent to /. 900 600 tons of ore
per acre. or 6OOOO.O00 tons of the better
grade ore, and 12,0O0,0O0 tons of the lower
grade ore in this body. OF the 6O.000,O00
tons of better grade ma terial. body of
90 100000 tons is fully developed. or. in
other words. blocked out so that it can
be accurately measured and its value
definitely determined: 20. 900, 600 tons are
partially developed. that is to say, de-
velOpments have gone far enough to
prove the existence of this additional
quantity of mineral but not sufficiently
far to permit of its being measured and
sampled on all sides. The remaining 20
900 600 OF the 60.000 900 tons is classed as
undevelooed for the reason that its eX-
istence Is only shown bV q limited num-
her workings. most of which are diamond
drill holes. In the seventy-two-acre area
under discussion is zone of lower grade
ore. averaging about Is per cent, and
probably containing about 20 000. 0g0 tons.
This zone is entirely undeveloDed. save by
diamond drill holes that pierce it. but its
existence has been proven wherever drill
inc has been done.
The total area of mineralized porphvry
contained within the boundaries Of the
nronertv Is about tf0 acres. leaving eieh-
ty-eight aeres which are not considered
nc in anv way deveiODed although q pOr-
ton of the area is known to contain ore
of profitable grade
The ground to the south and east OF
the area shown as developed and par
tally developed. and lying on the south
side of the canyon, also has some posi- |
bilities. This Is shown by number Of
ground, and by work donerin the imme-
date vicinity on contiguous property
On the north side of the canyon. and
to the east of the developed ore body in
dictated. a working of considerable ex-
tent. known as Tunnel g" has devel- |
Oped. for several hundred feet of its
though the main level workings, 200 feet |
vertically below show a lower grade of
material, still there is chance of de- |
veloping. some ore at this point.
q oh of he
eastern portion of the property is but |
slightly known. but the workings extend |
ing furthest in that direction, on the |
north side of the canyon, are stiil in ore |
of good grade and there is reason to |
believe that a portion of the area wiIhI
develop ore bodies of commercial value |
me mlne:alized porphyry area lying to /
the west OF the developed area, or down |
the canyon, is of lower grade than the /
average of the property, and. generally /
speaking similar to the twelve acres of |
ground heretofore mentioned as averaging |
slightly IN excess of Is per cent: in fact |
1t is entirely improbable that this whole
area will develop profitable ore bodies
but "A portion of it will do So
Taken as a whole not to exceed one
half of the total area known to con-
tain commercial values has been devel-
oped. Possibly not to exceed one-half
of the undeVelOped portion will prove as
high grade as the portion already de-
veloped. but it is likely that most of
the undevelOped area will contain values
tldt VIII SHOW pfOIlIS In operating in |
the future.
Methods of Mining.
The primary development on the prop
erty was laid out with a view TO un-
derground mining, by caving method /
and, until the starting of the Garfield
plant, practically all the ore extracted |
was mined in this way. The operations
of steam shovels have, however, proved |
SO satisfactory and economical that un-
foreground mining is being abandoned as
rapidly as possible. At the present time
about % per cent of the total tonnage
is coming from underground
work, and practically all of it from the
north side of the canyon. There are
some advantages in continuing under
ground mining in some portions of the !
property. because the ore mined in this
way is taken from the ore bodies living
directly beneath the Gaping, resulting in
the Gaping caVing into the open stones |
and breaking itself, so that il is not
necessary to blast il for steam shoVeling
On the north side of the canyon we have
a high point of ore. containing about !
800, 900 tons, which will be mined entirely
by underground methods as il will he
more economical to mine il in this way
than to strip it and mine it by steam
shoVels on account of the extensive
necessary to operate the
shovels, and remove Gaping. at this high
elevation. When the ore is removed al
This point. the everything Gaping will