periodic wet screening checks of the CM for fines from the kimberlitic material were carried out in order to verify the presence, quantity and size of non-magnetic contaminants that could increase the viscosity of the CM;
periodic dry screening checks of the CM particle size analysis were carried out in order to determine the coarsening of the CM due to a reduction of fine ferrosilicon particles;
periodic checks of the +1 to -6 mm float material exiting the process plant for any >1 mm sized kimberlitic indicator minerals (“KIMs”) such as pyrope garnet (S.G. 3.50), eclogitic garnet (S.G. 3.50) and Cr-diopside (S.G. 3.20); and
density tracer tests were carried out on a daily basis to monitor the separating effectiveness of the DMS cyclone.
13.2.2 SORTEX QA/QC OPERATING PROTOCOLS
In order for the Sortex to maintain operating efficiency, the unit was calibrated weekly by conducting marble tracer tests. As well, a preventive maintenance schedule for the Sortex unit was strictly followed on a regular basis.
13.2.3 GREASE TABLE QA/QC OPERATING PROTOCOLS
During the underground bulk sampling and processing program, auditing of the grease table efficiency and recovery with the use of “test or spiked diamonds” inserted directly into the grease concentrate feed was not carried out.
13.2.4 PROCESS PLANT - PREVENTION OF SAMPLE CONTAMINATION
Contamination of samples by diamonds from previously run samples can adversely affect sample results and subsequent economic decisions. Therefore, strict guidelines were followed by Shore to prevent batch sample cross-contamination.
13.2.5 PROCESS PLANT - DIAMOND RECOVERY EFFICIENCY AND QA/QC AUDITS
The over-all diamond recovery efficiency is considered by Howe to be high as discussed below.
Audits of grease and coarse reject kimberlite table tailings have been regularly undertaken since 2004 and are described in detail in Eggleston et al. (2008).
AMEC concluded that audit results for the recovery plant tailings were good, as expected, and tailings data were accepted with no problems. AMEC assumed that this circuit operated normally, based on Shore’s tracer test results in conjunction with audit results from SGS Lakefield.
Results obtained to October, 2007 from MSC indicate that low diamond recoveries from the audited samples confirm the integrity of the process and recovery plants. Most of the diamonds recovered from the audited samples are small and of poor quality.
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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