MINERAL PROCESSING AND METALLURGICAL TESTING
Parts of the following section have been sourced and summarised from Eggleston et al. (2008) and various internal reports outlined in the following sections.
PHASE 1 TO 3 UNDERGROUND BULK SAMPLING PROGRAM
Upon completion of the underground bulk sampling program on the Star Kimberlite, a combined total of 10,966 carats of commercial sized diamonds greater than 0.85 mm were recovered from a total of 75,435.68 dry tonnes of kimberlite material that was processed through Shore’s batch sampling process plant from both Shore’s 100 percent owned Star Kimberlite and the FALC-JV Star West bulk sampling programs. Tonnages include sampling of drift material, underground resource evaluation (RE) samples, geotechnical test samples and clean-up samples. Carat totals include 101.23 carats recovered from grease tailings and picked concentrate audits and 3.59 carats from float tailings audits. Total production and sampling results are summarized in Table 15.1 and presented in detail by batch in Eggleston et al. (2008).
Table 15.1: Summary of combined production and sample results (underground, RE, geotech and clean-up) for Star Kimberlite (including Star West)
includes carats from grease tailings and picked concentrate audits (101.23 carats) and 3.59 carats from
float tailings audits.
Utilizing all underground batch sample results, the average run-of-mine (“ROM”) grade obtained from the processed batches from the Star Kimberlite was 14.54 cpht.; however, if the clean-up data is removed the ROM grade is 15.85 cpht. The average ROM grade of the various Star Kimberlite units is presented in Table 15.2.
Table 15.2: Summary of underground ROM diamond grades from the various Star Kimberlite units
Kimberlite Phase (or Rock Type) LJF Total MJF Total EJF Total (includes EJF-PK, KB and combined) PPK CPK
Grade (cpht) 2 7 18 13 18
P&E has reviewed the geological model produced by Shore and compared it with the sampling of the kimberlite through underground bulk sampling. P&E considers the underground samples within the LJF, MJF, EJF, PPK and CPK to be representative of the kimberlite. In particular, the
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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