During 1997, two vertical PQ (75 mm) core holes confirmed the presence of four stacked kimberlite zones which were subsequently referred to as the Star Kimberlite.
In 2000, 15 vertical NQ (48 mm) holes and one vertical PQ core hole were drilled. Pyroclastic kimberlitic material was intercepted, while the core logging indicated that a major zone of dominantly medium- to coarse-grained kimberlite, resulting from an unknown number of eruptive centres, could be correlated over an area extending 1.5 kilometres north–south and one kilometre east–west. All of the drill holes completed during 2000 were diamondiferous.
In 2001, seven vertical NQ holes were drilled to further delineate the Star Kimberlite. Upon completion of the diamond drilling programs, and also in 2001, Shore undertook a single LDD reverse circulation (RC) drill hole to provide a mini-bulk sample.
During 2004, a second airborne geophysical survey was flown, to help identify kimberlite bodies with a weak or non-magnetic signature, and to provide additional information on those kimberlite bodies already identified from the existing regional magnetic airborne surveys. Eight NQ core holes were drilled to test the better of the geophysical anomalies, and to infill drill areas of the Star Kimberlite.
In May, 2005, and May, 2006, Shore contracted Spectrum Mapping Corporation (“Spectrum”) to fly two separate regional airborne laser surveys to provide data for digital terrain elevation models.
Bulk sampling of a portion of the Star Kimberlite from a shaft and lateral drifts commenced in 2003 and continued through to April, 2007, in three phases:
Phase 1 comprised site clearing and infrastructure development, geotechnical drilling, drilling of freeze holes required for the development of the shaft sinking program, shaft sinking, lateral drift development, an underground drilling program and sampling of about 25,000 tonnes of kimberlite for diamond grade estimation and diamond valuation purposes;
Phase 2 was designed to obtain at least an additional 15,000 dry tonnes of kimberlite from both the Early Joli Fou and Cantuar kimberlites for diamond grade estimation and diamond valuation purposes; and
Phase 3 comprised additional large tonnage kimberlite batch samples to obtain approximately 25,000 tonnes primarily from the Pense and Cantuar kimberlites for diamond grade estimation and diamond valuation purposes.
From July, 2005 to May, 2007, 160 PQ SPF-series surface core holes totalling 38,742 m were completed on the Star Kimberlite by Shore. Encore Coring and Drilling Inc. (Encore) of Calgary, Alberta were contracted to carry out the PQ core drilling program.
Between May, 2005 and September, 2007, 8,440 metres of mixed PQ and HQ (65 mm) core in 32 holes were completed on Star West. From April, 2006 to November, 2006, 7,151 m in 38 NQ and HQ diameter SND-series surface core holes were completed on the Star Kimberlite. Encore was contracted to perform the SND-series core drilling program. These holes were drilled to obtain geological, geotechnical and hydrological information for 3-D geological and resource modelling work. The SND-series core was logged by Clifton and Associates of Regina, Saskatchewan. The types of tests completed during this phase of drilling included:
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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