Mining drilling results Wed 1 Apr 98
Rupert Resources Ltd RUP
Shares issued 7,218,362 Mar 31 close $3.30
Wed 1 Apr 98 News Release
Mr D. Neil Briggs reports
Rupert Resources has received diamond counts from drillhole Crown-3 at the
Crown diamond mine project in South Africa. These results, which
substantiate previously reported results from drillhole Crown-1, are
detailed below. Results from drillhole Crown-4 in the Satellite pipe are
expected soon. Drillhole Crown-6 is drilling in the Main pipe having passed
through the Satellite pipe; initial samples from this drillhole will be
submitted for analysis within the next week.
Drillhole Crown-3
Sample Kimberlite From To Metres Weight
No. Type (kg)
2721 KBX 476.3-487.5 11.2 17.90
2722 K4 494.3-509.4 15.1 23.92
2723 K6 529.0-544.5 15.5 26.61
2724 K6 544.5-555.5 11.0 22.30
2725 K6 555.5-576.6 20.5 20.42
2726 K2 608.0-618.0 10.0 20.90
2727 K6 618.0-628.0 10.0 19.30
2728 K6 634.5-646.0 11.5 22.10
2729 K6 654.0-667.0 13.0 22.97
2730 K6 667.0-682.5 15.5 24.36
2731 K6 682.5-692.0 9.5 19.76
2732 K6 722.5-730.2 7.7 19.07
2733 K4 730.2-743.0 12.8 24.05
2747 K4/K2 743.0-758.0 15.0 22.96
2748 K2 758.0-775.8 17.8 25.00
2754 K4/K2 830.8-849.7 18.9 24.83
2755 K2/K4 864.4-885.6 21.2 28.40
2756 K6 941.0-958.1 17.0 17.70
TOTAL 253.20 402.55
Number of Diamonds
Actual Standardized
per 100 kg
Sample Total Nb Macro(x) Total Nb Macro(x)
No. Diamond Diamond Diamond Diamond
$ $ $ $
2721 0 0 0.0 0.0
2722 33 9 138.0 37.6
2723 10 0 37.6 0.0
2724 8 3 35.9 13.5
2725 12 1 58.8 4.9
2726 8 3 38.3 14.4
2727 3 0 15.5 0.0
2728 10 7 45.2 31.7
2729 4 1 17.4 4.4
2730 5 2 20.5 8.2
2731 0 0 0.0 0.0
2732 6 1 31.5 5.2
2733 34 18 141.4 74.8
2747 31 4 135.0 17.4
2748 35 3 140.0 12.0
2754 28 9 112.8 36.2
2755 43 19 151.4 66.9
2756 1 0 5.6 0.0
TOTAL 271 80 67.3 19.9
(x) Macros are those diamonds for which one dimension exceeds 0.5 mm.
Drillhole Crown-3 was drilled to a total depth of 977.4 metres at an
azimuth of 165 degrees and an angle of 55 degrees from horizontal. From
476.3 to 977.4 metres the hole intersected a total of 501.1 metres of
kimberlite and kimberlite breccia with included rafts of country rock. This
represents a horizontal width of about 270 metres and a vertical extent of
about 420 metres.
The major types of kimberlite encountered in this drillhole are all very
similar with a micaceous kimberlite matrix and are consistent with the
interpretation that they are parts of a single intrusive phase. They differ
predominantly in the abundance of country rock xenoliths (CRX) and are
described as follows:
K2 quite pure hypabyssal kimberlite with 0 to 15% CRX but usually less than
10% CRX
K4 fairly pure hypabyssal kimberlite with up to 40% CRX but usually 10 to
20% CRX
K6 impure hypabyssal kimberlite to kimberlite breccia with 40 to 75% CRX
and an average of 50 to 65% CRX
KBX impure kimberlite breccia marginal to the pipe with 75 to 90% CRX
>From surface to a depth of about 600 metres the kimberlite is mostly K6
with a relatively large proportion of country rock fragments, this material
is similar to the 4.5 million tonnes previously mined from the upper
portion of the Main pipe which had an inferred in-situ grade of about 30
carats per hundred tonnes (cpht). The kimberlite below 600 metres has fewer
country rock xenoliths and much higher diamond counts, it is therefore
expected to have an in-situ grade considerably higher than 30 cpht.
Samples, estimated to be 20 to 25 kilograms each, of split drillcore were
placed in buckets at the drillsite, sealed, taken to Johannesburg, shipped
air freight to Toronto and forwarded to Lakefield Research in Lakefield,
Ontario. Lakefield Research carried out its standard method of diamond
recovery by caustic dissolution followed by microscopic examination,
measuring and weighing of the recovered diamonds. Extensive internal
quality control procedures are followed by Lakefield.
Petrographic examinations and mineral chemistry studies will be performed
on portions of the retained drillcore. The balance of the drillcore will be
retained on site for future reference and check analyses as necessary.
Initial check analyses of selected drillcore will be carried out by De
Beers.
Drillhole Crown-6 is drilling Main pipe kimberlite at a 669.2 metres
downhole.
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