Arizona republican., 1922-05-17
PROPERTY WAS
WELL DEVELOPED
BY THE {. & A.

CONTINUED from Page 1, Section p
uneven nature of the rock, the re-
covery of core was low, and neither
core nor sludge samples alone were
satisfactory. To obtain an accurate
assay value for the ore developed,
the length of core for every five-foot
advance was measured: and on the
basis of this length of core the sludge
and core assays were combined to
give q final value which represented
all the material removed from the
hole during the five-foot advance.
The E. j. Longyear company fur
nished a chart which greatly simpli-
fled the work of combining core and
sludge samples.
After drilling had been in progress
for about six months, test pltting
was started to check the results of
drilling. The pits were about four
feet in size and We're sunk with wind
lasses. Drilling was done by hand
Mexican and Papago Indian miners
We're employed for this work. usually
under contract. and soon became SO
efficient that to q depth of so feet
the test pits were sunk more cheaply
than diamond drill holes. During
the last year of development test
pits so feet deep We're sunk on CO.
ordinate points in advance of drill
ing in order both to expedite and to
lessen the cost of development.
In sinking test pits. every tenth
bucket windlassed from the hole was
taken for sample. The large sam
pies thus obtained for every round
shot were crushed, quartered and
sent to Bisbee for analysis. After
test-pitting was finished, the pits
We're resampled in five foot sections
by channeling All four sides of the
pits We're channeled with even rec
tangular vertical grooves six inches
wide by three inches deep, giving
about a 500 pound sample for every
| fiye-foot section. These samples
We're crushed, quartered and assayed
| at Ajo, and pulp samples We're re-
assayed in Bisbee. The channel sam
| pies averaged about 0.15 per cent
lower than the bucket samples and
We're taken as the final samples OF
the test pits.
When test pits We're sunk below
water level into sulphide ore, a small
flow of water was encountered. This
made sinking slow and expensive.
a.
of sinking was done in Sulphide ores.
To more thoroughly check the results
of drilling in sulphide ore, and to
prove that the ore was constant in
grade between drill holes. drifts We're
run on coordinate lines from the
bottoms of two of the deepest test
pits. Raises were put up from these
drifts to check drill holes.
To give fair sample of material
cut by the drifts, the ore broken by
every round of holes was hoisted
separately and dumped on an iron
plate. From here it was shoveled
into cars or over the dump, and every
tenth shovel was thrown into a bin
for the sample. These large SAM
pies, each representing a carefully
measured round. We're taken to the
mill, crushed. quartered and sent to
Bisbee for analysis.
To date, so diamond drill holes
have been drilled on the original
New CorneHa property, varying in
depth from zoo to 1000 feet. The
total footage of diamond drilling is
26,S27 feet. Nineteen drill holes were
stopped in ore.
In all, n test pits were sunk, with
a total footage of 1855. OF this test
pitting 1906 feet We're in carbonate
ore and 349 feet in sulphide ore;
1859 feet of test-pitting checked drill
holes in carbonate ore; 175 feet
checked drill holes in sulphide ore,
and 2721 feet were in advance of
drilling The total amount of drift
ing in sulphide ore was 1913 feet.
The combined sinking and raising on
drill holes in sulphide ore amounted
to 317 feet
No test pits were sunk on the Aio
Consolidated group. The bulk of the
ore was developed by 63 diamond
drill holes having a total footage of
2S,307 feet. These drill holes vary in
depth from 1855 to 9S5 feet. The
methods of sampling were the same
as those used on the New Cornelia
group.