Table 10.2: Summary of the fall 2008 geotechnical/hydrogeological drilling program on the
Prior to drilling a LDD hole on Star one pilot hole was completed to a depth of 268.35 m. This hole intersected a total of 132 m of kimberlite.
10.1.1 SURFACE DRILL COLLAR SURVEYING
Upon the completion of each surface core hole the drill collar was re-surveyed either by Tri-City Surveys (“Tri-City”) with the use of a Trimble 4800 differential GPS unit with base station or by a Shore surveyor utilizing the Tri-City established base points.
2 0 2 0
Star Kimberlite Hole ID
# of Geotech
SURFACE CORE DRILL DOWNHOLE SURVEYING
Downhole surveying was completed using two primary methods: a multi-shot surveying tool and a gyroscopic tool. The multi-shot surveying tool was utilized below the kimberlite (in non- magnetic sediments) and throughout the borehole. Due to moderate to strong magnetism of some of the kimberlite units (primarily caused by magnetite replacement of serpentine), down- hole surveys of the core holes were carried out by Gyrodata Services Canada Inc. (“Gyrodata”) of Calgary, Alberta. These core holes were surveyed with Gyrodata’s rate-gyroscopic wellbore
The self-orienting gyroscope has an
accuracy of 0.1°. intervals.
Downhole gyroscope measurement readings were
azimuth taken at
m or 50 m
All of the down hole survey data was digitally acquired. Shore personnel reviewed the raw survey data and incorporated it into the project database.
10.1.3 DOWNHOLE GEOPHYSICAL SURVEYING
Upon the completion of each surface core hole (SPF-series, SND-series), a downhole geophysical survey was carried out by DGI Geoscience Inc. (“DGI”) of Mississauga, Ontario. The majority of the holes were successfully surveyed but some holes had collapsed and were impossible to survey. The goal of the downhole geophysical survey was to record the physical properties of the various kimberlite lithologies in order to assist in the stratigraphic hole to hole lithologic correlation of the various kimberlite and non-kimberlite facies for the 3-D geological modelling of the Star Kimberlite.
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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