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AUSTRALIA FLINDERS RANGES
DIAMOND PROJECT

Drainage Sampling Confirms Five On-Source Kimberlite Anomalies

Since August, 1998 Tiger International Resources (TGR.V) has been conducting a systematic drainage sampling program within the boundaries of the Tiger-Springfield Project designed to locate the primary source of the diamonds discovered by the1998 bulk sampling. Four phases of stream sediment sampling have been completed, the last being in February 1999:

Phases of Springfield Drainage Indicator Mineral Sampling

Phase	Dates Collected		Samples Collected
	From	To	From	To	Number
1	8.20.98	9.24.98	KA001	KA080	80
2	10.30.98	11.20.98	KA081	KA123	43
3	12.11.98	12.18.98	KA124	KA152	29
4	2.8.99	2.12.99	KA153	KA177	25
Totals	8.20.98	2.12.99	KA001	KA177	177

After the first phase, 26 anomalies were defined. Seven of these were thought to have been derived from known secondary sources of the Springfield Basin and 19 were outside the influence of the Springfield Basin. These 19 are thought likely to lead to several new primary diamond sources.

The anomalies with large numbers of indicator grains described as fresh or very fresh (within about two kilometres of source) have been followed up in phases 2-4. There remain five anomalies yet to be followed up (KA2, 18, 19, 23 and 60) which are regarded as high priority, and likely to lead to new kimberlites.

Sampling in phases 2-4 has led to a recent emphasis at five "on source" kimberlite targets. The term "on source" is used by mineralogists and geologists to describe kimberlite indicator minerals which show no textural evidence of abrasion caused by sedimentary transport, and which often have clay mineral coatings which could represent remnant kimberlite rock matrix adhering to the minerals.

An "on source" description suggests that the source lies within about 100-200 metres of the sample collection site. Also, in Tiger's recent work, there has been a deliberate emphasis on areas with undulating topography and shallow regolith cover of less than two meters, enabling Tiger to expect that kimberlites can be located by shallow excavator trenches which would then be immediately available for bulk sampling without the need to drill holes.

The five on source targets are KA12, 72, 101, 113 and 117. Recent work has included re-examination of the textural features of anomalous samples from each anomaly cluster as well as electron microprobing of indicators, leading to the conclusion that new primary kimberlites are the best explanation for the results. Furthermore, as well as numerous kimberlitic chromite anomalies in all target areas, anomalies KA101 and 117 contain group 11 pyrope garnet suggesting not only new kimberlite sources, but ones with good diamond potential.

Source: Tiger International Resources