In May, 2005 and May, 2006, Shore contracted Spectrum to fly two separate regional airborne laser (light detection and ranging system, or “LIDAR”) and digital camera surveys covering a 324 km2 area over the core group of claims surrounding the Star resource and those surrounding the major part of the FALC kimberlite field. The resolution of the LIDAR surveys was one meter. All survey data are referenced to the UTM NAD 27 Zone 13N projection. P&E compared LDD collar elevations to the supplied topographic surface and no discrepancies were noted.
Shore geologists have identified multiple kimberlite eruptive units associated with the Star Kimberlite. Five economic kimberlite units were used for resource modelling:
Late Joli Fou Kimberlite (LJF);
Mid Joli Fou Kimberlite (MJF);
Early Joli Fou Kimberlite (EJF);
Pense Kimberlite (PPK); and
Cantuar Kimberlite (CPK).
Kimberlite unit wireframes were developed by Shore geologists using sectional interpretation of diamond drilling logs linked into three-dimensional solids by sectional and plan ring sets (Figure 16.2). Where not defined by drilling, the distal limit of the Star Kimberlite has been defined by EM signature. The kimberlite units have been modelled to a lower limit of 70 masl (approximately 350m below surface). The EJF kimberlite unit has been further subdivided by Shore into Inner (vent proximal) and Outer (vent distal) units, associated with the formation of a cinder cone (Figure 16.1). Further sub-division of the kimberlite units has been completed by Shore with respect to differentiation of kimberlite breccia and pyroclastic kimberlite sub-units, but due to the discontinuous nature and vertical interfingering of the sub-units, modelling of the sub-units at the scale of the deposit has proved impractical.
P&E reviewed the Shore wireframes for overlap, triangulation errors and adherence to geological contacts. In response to P&E validation checks, the EJF wireframe was modified slightly, which produced a minor overlap. P&E believes the geological wireframes prepared by Shore to be suitable for Resource Estimation.
In addition, surfaces representing the base of the stratified glacial drift and the base of glacial till were supplied by Shore and used for preliminary waste modelling.
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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