Avocet Mining PLC Prospectus December 2011

Avocet Mining PLC
West African Projects
Drilling was supervised by a geologist who produced a brief rock description of the core and
measured rock quality distribution (RQD) at the drill rig site.
6.8 Sample Preparation, Analyses and Security
All Koulekoun samples are currently processed through the SGS laboratory at Siguiri in
Guinea. The laboratory sample preparation methodology followed involves:
weighing,
high temperature drying,
fine crushing at 70% passing 2mm,
splitting (by riffle),
pulverising 1.5kg to 85% passing 75μm,
screen analysis of 100 g for 1 in 20 samples to check pulverisation,
every 10th sample has a duplicate sample, and
Laboratory standards (4 different grads), and blanks.
6.8.1 Sample Collection
Reverse Circulation (RC) drill samples are taken at 1m intervals. The sample is sieved and
washed to yield a +2mm fraction that is logged by a geologist. For each sample, a small
reference sample is kept of the non‐washed and +2mm washed material.
A representative sample is stored on‐site for reference and another sample is dispatched to
the assay laboratory. The bulk reject is stored on‐site.
Diamond drill core is laid out and cleaned prior to being photographed. The core boxes are
then placed on the tables by hole and depth. Prior to geological logging the core is laid out
on racks, checked and aligned along its centre line.
Once the core has been logged, it is cut in half by a diamond saw. One half of the core is
retained for reference and the other half is sampled. Standard sample length is one metre
except at geological contacts. Samples are sent to the assay laboratory accompanied by a
sample ticket.
6.8.2 Geological Logging
Geotechnical logging was conducted at the rig site including, but not limited to,
measurements of core loss, rock density quality (RQD), fracture frequency (FF), and
orientation reliability. Geological logging, including structural measurements, is conducted
on computer‐data entry style sheets at a core logging facility, a short drive from the
mineralised areas.
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