The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1909-06-08
REPORT OF HENRY
KRUMB ON RAY CON
Long-Expected Expert Summing
Up Received Out West by
Stockholders.
SPLENDID TONNAGE OF
ORE is DEVELOPED
Unique Method of Modern Red
Metal Mining Is Given
Full Explanation.

Western stockholders Of the Ray
Consolidated Copper company are IN
receipt of report on the property
made By Henry Krumb, the well-known
Salt Lake mining engineer. This an
ticpated report brings the develop
ment of this noted Arizona copper
proposition up to date, and is filled
with many points of interest The re-
port sets forth that the company is the
owner of 1000 acres in the Mineral
Creek mining district, at the eaa o1a
camp of Raw, Pinal county. About ouU
acres are patented and patents are
under way for the balance. The com
pany also owns 200 acres at the town
of Kelvin, where the new concentrating
plant will be installed Mr.. krumb S
report follows:
tThe mineralized belt in which the
properties of the Ray Consolidated Cop
per company are located consists OF an
area of highly altered and siliclfed
schist The belt has length, east
and west, of about two miles, and a
north and south width of about one
mile. The greater part of this area
is covered by claims owned by the Ray
Consolidated Copper company. The
siicifed schist is cut by dikes, stills
and accoliths of granite porPhyry and
diabase. Within the area of the min
eralzed belt and the zone of sec
schist, granite porphyrv or diabase, are
about equally mineralized, Near the
contact Of schist and diabase there
usually is streak OF higher grade of
ore. The naturalization consists of
uniform dissemination of copper min
erals through the mass of rock and of
small seams and veinlets Of mineral
running in all directions.
1.-The genesis of the ore deposit is
similar TO that of The copper bearing
porphyry deposits of Bingham and Ely,
Near the surface is the oxidized zone
from which most Of the copper values
have been leacEed. This zone is from
20 to 400 feet thick, averaging 217
feet, and is underlain by an en-
riched zone in which the copper,
leached from the oxidized zone above
form OF chalcocite, although chalcopy
rite is universally present, and occa-
siona!ly native copper, the latter
especially in the upper parts Of the ore
body in certain sections. This zone,
which forms the commercial ore body,
averages 100 feet in thickness. IT is
underlain by the primary ore zone,
carrying. low copper values In the form
Of cupriferous pyrite.
OF shafts, drifts, raises and tunnels on
the Ray property. The major part of
this work, or about 1000 feet, has
been driven in what is known as Ray
Hill on three levels, about fifty feet
apart. Generally speaking, the results
of sampling these underground work
ings corroborate the results obtained
The whole property has been di-
vided into blocks 200 feet square by CO
ordinates. "At each corner of the de
veloped squares churn drill holes have
been drilled through the enriched zone
TO the primary formation below. Up
TO May ID l5l holes have been com
pleted, having an average depth of 81
feet. or total footage Of 81 900 feet.
"A sampler is continually stationed
at each drill. and ii is his sole duty to
take care Of the sampling. Every Dos
slble precaution has been exercised to
obtain reliable results. The drill
sludge, consisting of finely ground rock,
shines and water, has been check. |
sampled in different ways-alwavs Civ.
ing approximately check results The
assaying Of the samples is being con-
tinually checked by outside assayers a
number of drill holes have been cut
by underground drifts, and raises have
been driven alongside Of other drill
holes. After such raises were com
pleted large samples were molled from
the groove Of the drill hole in the side
Of the raise. Samples taken from
raises In the above manner averaged
2,69 per cent copper. against 24s per
cent. the average Of the drill sjudge
samples representing the same sections
Similar results have been invarab.
~ obtained where underground drifts
have cut drill holes. The samples
taken in the drifts averaged uniform
~ higher than the drill samples
taken from the same sections. Further
checking By drifts and raises will be
carried on until the results of con.
holes has been checked
,'of the l51 drill holes completed to
May l5. 122 show commercial ore. OF
these, l06 holes are located in six
groups VIZ; Parson Ray. Diorite. Min
eral Creek, Consuelo, Sharkey and Ma.
ihias- Hall. BY connecting up the
holes IN each group by straight lines.
2l,oo0'OOo tons of ore. having an
average assay value Of go per cent
copper. No ore has been allowed he.
yond the exterior boundaries of com.
pletely drilled blocks, formed bv lines
connecting holes not in excess of 200
feet apart: and the estimate of 81 600.
600 tons is, therefore, an estimate of
the ore completely blocked. Twelve
aud half cubic feet per ton has
been used in the calculations. In ar.
rivIug at the average grade of The
ore, all high or erratic ASSAYS have
been cut: also whenever considerable
caylng from the side Of the hole has
taken place assays have been reduced
As previously stated, the check .san,n.
hing indicates that the ore is of
higher grade than shown by drill
sdHiPlGS.
THE total acreage dcvcloped ;s
sixty acres, The acreage Of each proun
together with the tons Of ore de-
Heloped, ana Inc average grade Of the
ore, is as follows: 'Ae