As part of the advanced exploration program (and the revised Mineral Resource Estimate), Howe has carried out several site visits to the Star Kimberlite. As with the previous AMEC audits, Howe’s audits reviewed the operation of the Shore process plant and examination of the kimberlite material. Howe conducted regular visits in order to review all aspects of the technical work and QA/QC being carried out on the project (i.e. LDD and underground sampling and processing, geological core logging, etc.) and data verification reviews.
HOWE BULK SAMPLE PROCESSING AUDIT (2008)
An ideal audit of bulk sample processing and diamond recovery efficiency is to continuously run natural and/or synthetic diamond spikes through the entire process. In practice this is rarely done for diamond treatment, while it is standard operating procedure to insert blind standards and
blanks in analytical work for metals analyses. Random periodic spiking, which
for continuous spiking, performed in September
was performed twice at Shore’s plant. and December, 2008 are detailed below.
could substitute the latest audit
13.7.1 SAMPLES AUDITED BY HOWE
The following two samples were chosen by Howe for auditing:
a LDD batch sample, composed of nine bulk bags weighing 12.59 wet tonnes. The resultant concentrate samples were represented by grease concentrate sample number 19379 and x-ray concentrate sample number 19380; and
an underground batch sample, weighing 453.99 wet tonnes or 412.81 dry tonnes. The resultant concentrate samples were represented by grease concentrate sample number 19381 and x-ray concentrate sample number 19382.
Howe placed 4 natural and 14 synthetic diamond tracers in the LDD mini-bulk sample, which was observed through the entire treatment process. In the underground bulk sample, Howe placed 16 natural and 99 synthetic diamond tracers.
The tracer diamonds are natural diamond crystals with at least one polished face and the tracer number and weight in carats laser-etched onto the polished face. These tracers also have known luminosity properties for x-ray recovery, and are of a variety of weights and shapes similar to what might be expected to occur naturally in a bulk sample. The synthetic tracers are resin cubes of the same density as diamond (3.53 g/cc), different sizes, and different levels of luminosity within the range of those shown by natural diamonds. The tracers were placed at random intervals into the raw sample feed just as it exited from the feed hopper and before it dropped onto the primary feed belt.
Howe received sample consignment information for the secure shipping to SGS Saskatoon (LDD sample) and MSC (underground sample). SGS Saskatoon routinely performs all x-ray and grease concentrate processing and diamond sorting (selection) of LDD samples, audit samples, and in the past has treated underground samples. MSC has been routinely treating the underground samples and audit samples.
Howe was present for the diamond sorting of the two audited samples at their respective laboratories. Chain of custodies, sample seals and sample integrity were checked. Procedures, operations, security and documentation were reviewed and observed. No issues were noted by Howe.
P&E Mining Consultants Inc. NI 43-101 Technical Report No 159 Shore Gold Inc. - Star Diamond Project Resource Estimate Update
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