were then recorded by mapping of the pile locations. The kimberlite muck was piled on top of a sand/clay rich base.
Individual batches were designed to provide representative samples of the different geological units encountered, while keeping individual sample batches similar in size where possible. Geological control of the sampling has enabled these kimberlite units to be individually sampled with very little contamination by other kimberlite types, the results of which provide invaluable diamond content data to model variations in diamond quality and abundance throughout the different phases of the Star Kimberlite.
In accordance with the information obtained from underground mapping, on-site geologists continuously refined the sample separation process. Sample batches thus changed from the optimum planned size, and some of the larger batches were subdivided into smaller batches for processing in the plant. Details of individual sample batches created in the bulk sampling program are given in Eggleston et al. (2008).
The following quality assurance and quality control (“QA/QC”) protocols were conducted and adhered to by Shore and its contractors during the bulk sampling program:
Shore geologists verified that all sample material for each sample interval was cleanly mucked out by TMCC;
to avoid sample mix-ups, Shore geologists verified that the kimberlite for each batch hoisted to surface was transported to its specified location;
all TMCC miners and Shore’s loader operators were given specific instructions not to overload their buckets when transporting kimberlite, to avoid sample spillage; and
in order to maintain sample integrity and security of all extracted kimberlite from the underground workings, a Shore security officer was present at all times during the movement of kimberlite muck from the head frame to the storage facility.
P&E (in part through the Howe 2009 audit) found the sampling methods, sample storage, and security to be acceptable and is of the opinion that diamond grade and quality data generated from these samples is adequate for Resource Estimation and mine planning purposes.
LARGE DIAMETER DRILL SAMPLING
Sections 10.3.1 and 10.3.2 detail the LDD sampling methods. As part of its audit processes, Howe reviewed the LDD sampling process during several site visits and found that it was performed in accordance with the written protocols and met, or exceeded, industry standard practices (Coopersmith, 2009). P&E and Howe are of the opinion the quality of the LDD samples is such that diamond grade and quality data generated from these samples is adequate for use in Resource Estimation; however, diamond breakage and loss during sampling require adjustment of the grades.
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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