9.3.2 Ground Geophysics
Following the 1996 airborne survey, 63 kilometres of north-south orientated line cutting at 100 metre line spacing was carried out over the highest priority target zones and, in July-August, 1996, some 54 line kilometres of ground magnetic surveying on 100 metre centres were completed on the grid. The ground geophysical surveys confirmed the presence of shallow, closed anomalies that are indicative of kimberlites.
GSC/SASKATCHEWAN DEPARTMENT OF INDUSTRY AND RESOURCES
During 2002, a joint targeted geoscience initiative between the Geological Survey of Canada and the Saskatchewan Department of Industry and Resources included the Star Kimberlite in its ongoing research program into the FALC kimberlite province. Work completed included:
bulk rock and multi-element lithogeochemistry of the Star 20 core hole (2002);
bulk rock and multi-element geochemistry and stratigraphy of the Star Kimberlite (2003);
independent geological logging of the Shore core drilling;
2-D and 3-D seismic surveys over the Star Kimberlite;
detailed borehole geophysics, comprising density, gamma (radiogenic Th, U, K), velocity
and temperature; completed on core holes Star 32 (352 metres), Star 25 (205 metres) and Star 26 (188 metres);
age dating. Four kimberlite samples were processed to isolate the mineral perovskite for U–Pb geochronology by Geospec Consultants Ltd (Edmonton, Alberta). The U–Pb analyses were performed at the University of Alberta’s Radiogenic Isotope Facility. Returned model age dates ranged from 102.8 ± 0.8 Ma to 105.2 ± 1.2 Ma.
A suite of thin sections was made during 2002 to 2003 on core specimens from drill holes Star 4, 16, 20, 24, 25, 26, and 32 to determine the petrographic affinities and to compare the geochemical characteristics between samples. In addition, 33 kimberlite samples from core holes Star 16, Star 24, Star 25, and Star 32 were submitted to MSC for petrographic examination and heavy mineral abundance analysis.
The petrographic work supported the genetic and affinity interpretations by Shore.
PRELIMINARY LDD SPACING STUDY STAR KIMBERLITE
In mid-2008, Shore requested that F.H. Brown of P&E conduct a preliminary study of LDD spacing for the Star Diamond Project. This study was used to determine future drilling requirements for the classification of diamond resources at other kimberlite deposits. In addition, the study was to recommend the optimized spacing required to ensure that the remaining LDD
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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