A QA/QC program covering the database management of underground shaft and drift sampling of Shore’s underground bulk sampling, LDD mini-bulk sampling, and diamond processing program was administered and monitored on a number of levels throughout the program. In P&E’s opinion, the sampling and processing procedures and QA/QC program for the underground bulk sampling, LDD mini-bulk sampling and diamond processing program is being well documented by Shore, and meets industry standards.
From January, 2003 to January, 2007, Howe provided third party supervisory and monitoring services to Shore in the sample processing, chain of custody and sample integrity of Shore’s underground bulk sample program and LDD mini-bulk sampling program. Howe believes that the quality of the diamond processing data is reliable and that the sample preparation, analysis and security were carried out in accordance with exploration best practices and industry standards.
Shore and Howe developed operating QA/QC protocols to monitor and quantify the efficiency and recovery of the process plant; these are discussed in detail in Eggleston et al. (2008) and outlined in the section below.
The following QA/QC operating protocols were established by Shore and Howe for the efficient operation of the DMS and recovery circuits.
13.2.1 DMS QA/QC OPERATING PROTOCOLS
During the operation of the DMS circuit, the operating parameters were strictly monitored by Shore and Howe in order to achieve proper kimberlite material separation:
the specific gravity (“S.G.”) of the circulating medium (“CM”) was measured manually every 15 minutes with a densitometer and in real time with a DebTech® dense medium controller system. Since the commissioning of the DMS circuit, the operating range, determined by numerous density tracer tests over several S.G. values was between S.G.
and S.G. 2.50;
CM specific gravity readings of both the DMS cyclone overflow and underflow collected periodically;
the operating range of the cyclone inlet velocity pressure was maintained at a constant pressure and it was ensured that the inlet velocity pressure remained constant (i.e. no surging);
it was ensured that the volumetric ratio between kimberlite material feed and CM fed to the mixing box was such that the loss of diamonds to the floats screen (due to the overfeeding of material through the cyclone) was negligible;
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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