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LDD SAMPLE LENGTH

Percent

35

30

25

20

15

10

5

0

  • 0

    2

4

6

8

10 m

12

14

16

18

20+

LDD SAMPLE MASS

30

25

20

Percent

15

10

5

0

0

5

10

15

20

25

30 Tonnes

35

40

45

50

55

60+

Figure 16-6: LDD sample length and mass

16.10 DIAMOND BREAKAGE ANALYSIS

Diamond breakage during drilling adversely affects both the estimated diamond grade and the diamond price model. In the EJF Inner area, LDD sampling produced an average grade in the +4.75 size fraction of 1.81 cpht, compared to the UG average of 4.98 cpht, indicating that larger stones were being preferentially broken and lost during drilling.

Recovered diamond grades from LDD batch samples were therefore adjusted upwards to compensate for associated diamond breakage and loss during drilling. Adjustment factors were determined based on EJF Inner area sample results only. The ratio of the average middle-fraction diamond grade between the LDD samples and the UG samples was used to compensate for the observed diamond damage (Table 16.4). The selection of the middle fraction interval is a reflection of the greater consistency of diamond plant recoveries in this range. The calculated adjustment factor was applied across the model for all units and P&E believes the adjustment

P&E Mining Consultants Inc. NI 43-101 Technical Report No 159 Shore Gold Inc. - Star Diamond Project Resource Estimate Update

Page 85 of 109

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