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orthogonally.
*Drill sample _Method of recording The RC rig sampling
recovery* and assessing core systems are
and chip sample routinely cleaned to
recoveries and minimize the
results assessed. potential for
contamination.
Measures taken to Drilling methods are
maximise sample focused on sample
recovery and ensure quality. Diamond
representative nature drilling (triple
of the samples. Tubed HQ diameter
core) was used to
Whether a maximise sample
relationship exists recovery when used.
between sample
recovery and grade The selection of RC
and whether sample drilling company,
bias may have having a water
occurred due to drilling background
preferential enables far greater
loss/gain of control on any water
fine/coarse present in the
material._ system; ensuring wet
samples were kept to
a minimum.
RC and Diamond holes
were all assessed
for the quality of
samples. This data
was recorded for
each interval in the
logging template.
Sample techniques
were chosen to
ensure the all
remained highly
representative of
the parent interval,
for example by using
a 3-tier riffle
splitter.
Sample quality and
recovery was
recorded for all
intervals. No
relationship exists
between sample
recovery and grade.
*Logging* _Whether core and All RC holes were
chip samples have geologically logged
been geologically and using the detailed
geotechnically logged company template,
to a level of detail based on industry
to support standards. All
appropriate Mineral diamond holes were
Resource estimation, geological and
mining studies and structurally logged
metallurgical using the same
studies. template in addition
to geotechnical
Whether logging is logging using a
qualitative or separate industry
quantitative in standard template.
nature. Core (or Logged data is both
costean, channel, qualitative and
etc) photography. quantitative
depending on field
The total length and being logged.
percentage of the
relevant Core photography was
intersections also captured for
logged._ every tray of
diamond core.
*Sub-sampling If core, whether cut All RC holes were
techniques and sample or sawn and whether geologically logged
preparation* quarter, half or all using the detail
core taken. company template,
based on industry
If non-core, whether standards. All
riffled, tube diamond holes were
sampled, rotary geological and
split, etc and structurally logged
whether sampled wet using the same
or dry. template in addition
to geotechnical
For all sample types, logging using a
the nature, quality separate industry
and appropriateness standard template.
of the sample Logged data is both
preparation qualitative and
technique. quantitative
depending on field
Quality control being logged.
procedures adopted
for all sub-sampling Core photography was
stages to maximise also captured for
representivity of every tray of
samples. diamond core.
Measures taken to Trench samples were
ensure that the representatively
sampling is collected across
representative of the each 1m interval by
in situ material 3-tier riffle
collected, including splitter in a dry
for instance results environment where
for field ground conditions
duplicate/second-half allowed.
sampling.
Diamond samples were
Whether sample sizes cut to ¼ core using
are appropriate to a core saw. The same
the grain size of the ¼ for each interval
material being was samples
sampled. throughout the
length of all holes.
All samples were
submitted for assay.
Sample preparation
at the Bureau
Veritas laboratory
involves the
original sample
being dried at 80
for up to 24 hours
and weighed on
submission to
laboratory. Crushing
to nominal -4 mm.
Sample is split to
less than 2 kg
through linear
splitter and excess
retained. Sample
splits are weighed
at a frequency of
1/20 and entered
into the job results
file. Pulverising is
completed using LM2
mill to 90% passing
-75 µm.
QAQC protocols were
followed, including
the use of field
duplicate samples to
test the primary
sampling step for
the RC drilling
along with certified
reference material
and blanks.
Sample sizes are
considered
appropriate with
regard to the grain
size of the sampled
material.
*Quality of assay The nature, quality Drill samples were
data and laboratory and appropriateness sent to Bureau
tests* of the assaying and Veritas Rustenburg
laboratory procedures (South Africa) for
used and whether the preparation and
technique is assaying. The
(MORE TO FOLLOW) Dow Jones Newswires
April 03, 2017 02:51 ET (06:51 GMT)
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