SAMPLING METHOD AND APPROACH
This sampling method and approach section has been sourced and summarized from Eggleston et al. (2008). The reader should refer to this report for detailed information.
UNDERGROUND BULK SAMPLE PROGRAM
Shore’s underground bulk sampling program began in 2003 and was completed in April, 2007. Thyssen Mining Construction of Canada Ltd. (“TMCC”) was contracted to develop the exploration shaft and extract the bulk sample from a network of lateral drifts.
Howe continuously monitored the underground bulk sampling program on-site, from 2003 to January, 2007. Howe geologists worked in conjunction with Shore geologists on all aspects of the program, including shaft mapping and underground developments. Howe had personnel working in the process plant full time from 2003 to January, 2007 and a representative of Howe was always present in the final recovery area when it was operational during this period.
From January, 2007 until present, Howe was involved in the bulk sampling program as a third party auditor making periodic site visits.
11.1.1 SITE SET-UP AND UNDERGROUND DEVELOPMENT
The underground bulk sampling program began in January, 2003 with initial infrastructure development and the sinking of a 4.3 m diameter, concrete-lined shaft to 250 m below surface. During shaft sinking, an initial lateral development station was installed at 175 m below surface and 15 m of lateral drifting took place. In addition, an underground drill rig was lowered to the 175 m station and exploration drilling commenced alongside the shaft-sinking activities. The shaft then continued down to a final depth and a second lateral development station was installed at the 235 m level during this phase. This shaft had been sunk through approximately 90 m of overburden, 17 m of Cretaceous shale, 63 m of the LJF and MJF kimberlite and 80 m of EJF Kimberlite.
In May, 2004, Phase 1 lateral drift development commenced on the 235 m level and was completed in November, 2004, when Shore estimated that a minimum of 25,000 tonnes of kimberlite had been sampled primarily from the EJF and CPK for diamond grade estimation and diamond valuation purposes. Approximately 1,000 m of was completed during the Phase 1 bulk sampling program (Table 11.1). Underground batch sample sizes ranged from 250 dry tonnes to 350 dry tonnes.
From April to November, 2005, Phase 2 of the bulk sampling program was performed by Shore in order to obtain an additional 15,000 dry tonnes of kimberlite from both the EJF and CPK for diamond grade estimation and price estimation purposes. A total of 820 m of lateral drifts were developed from the 235 m level as well as from a ramp that cut the EJF material from 235 m to the 215 m level.
From February, 2006 to April, 2007, Phase 3 of the sampling program was completed in order to obtain 25,000 tonnes primarily from the PPK and CPK for diamond grade estimation and valuation purposes. A total of 1,106 m of lateral drifts were developed from the 235 m level as well as from the 215 m level where the PPK was sampled.
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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