piezometer and pump test drill holes;
geotechnical holes; and
glacial till stratigraphy drill holes.
From June, 2004 to December, 2006, 213 BQ UG-series core holes totalling 16,863 m were completed on the Star Kimberlite by Shore. Barkor Drilling of Snow Lake, Manitoba was contracted to carry out the UG core drilling program. Two JKS-Boyles B-15 underground core drill rigs were utilized to carry out the underground core drill program. These core drill holes were carried out as pilot drill holes for lateral drift development. The underground core holes were drilled from the lateral drift faces in a vertical fan pattern at 100 m lengths with varying inclinations from +15° to –10°. Upon completion, each core hole was grouted in its entirety.
A modular ten tonne per hour diamond recovery plant was constructed on-site to treat the underground, and, later, LDD samples. A total of 279 underground batch samples, 59 resource evaluation (“RE”) samples and four geotechnical samples totalling 75,435 dry tonnes of kimberlite from the Star Kimberlite were processed through the process plant from January 26, 2004 to November, 2007.
From September 14, 2005 to December 27, 2007, a total of 15,755 m in 80 LDD was completed on Shore’s portion of the Star Kimberlite. On the FALC-JV (Star West) property an additional 15 LDD holes were completed totalling 3,595 m. The LDD program was completed to obtain geological information and to obtain “mini-bulk” samples for processing to give diamond grade information on the various kimberlite facies previously defined from the surface core drilling program.
The LDD holes were drilled vertical on a 100 m by 100 m grid pattern within the thicker central portion (proximal vent area) of the Star Kimberlite and at 200 m by 200 m intervals on the thinner more distal portions of the Star Kimberlite.
From those initial 95 LDD holes a total of 1,336.29 carats of diamonds greater than 0.85 millimetres were recovered from a total of 9,788.78 processed dry tonnes4 of kimberlite representing 18,923.75 in-situ tonnes5 from the LDD drilling. That kimberlite was processed through Shore’s processing plant giving an average in-situ grade of 7.06 cpht (Table 5.1).
4 Processed sample mass refers to excavated kimberlite chips greater than one millimetre that were recovered in mini-bulk bags for diamond recovery in the processing plant.
5 Calculated tonnage is based on hole diameter measured by caliper and volumes calculated from those measured diameters and/or a modelled uniform cylinder for the drill hole and measured density values from pilot core holes. Calculated and processed tonnages differ because samples are screened at the drill and all sample that is less than one millimeter is discarded.
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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