Graynic Metals Limited owns Exploration Licence 04/1551 which hosts the entire Walgidee Lamproite Intrusion in the West Kimberley region of Western Australia. The Walgidee Lamproite is a known diamond-bearing intrusion from which 891 micro diamonds and 62 macro-diamonds have been recovered. The 11 macro-diamonds recovered by Diamond Rose NL in 1998 comprised 6 white (colourless) stones, 4 brown and 1 yellow, ranging in size from 0.8mm to 1.5mm. The results of previous exploration are summarized in the following table:
| Company | Year | Indicator Minerals |
Macro diamonds |
Micro diamonds |
Total diamonds |
| Stellar Minerals | 1968 - 1971 | - | - | - | - |
| Stockdale Prospecting | 1970 | - | - | - | - |
| Seltrust Mining Corp | 1978 - 1980 | - | 1 | Not tested | 1 |
| CRA Exploration | 1988 - 1989 | - | 17 | 520 | 537 |
| Great Central Mines | 1993 - 1995 | Yes | 33 | 368 | 401 |
| Diamond Rose NL | 1997 - 2005 | Yes | 11 | 3 | 14 | Totals | 62 | 891 | 953 |
The Walgidee Lamproite is reputedly the largest lamproite in the world, with a diameter of about 2.5km and an area of about 490ha. Various campaigns of bulk testing of pit samples as well as testing of drill samples have been carried out over the years, but most of these trials have been confined to the eastern half of the intrusion. It is the Company’s opinion that the amount of testing to date may have been inadequate for such a large intrusion and that there is good potential for a commercial diamond deposit to be discovered.
The project area is located approximately 80 kilometers south of the Ellendale Diamond mine operated by Kimberley Diamond Company NL and currently undergoing an expansion which will establish the operation as a “Top 5 Western World diamond producer”. In the same area Blina Diamonds NL has recently completed a bulk sampling program at its alluvial project at Ellendale 9 North and recovered 3766 diamonds weighing 1442 carats from a 3773 tonne gravel sample.
At the Walgidee Project, Diamond Rose NL has reported on a "zone which may contain a very high potential for an economic discovery" (Diamond Rose NL Quarterly Report, March 2002) which has yet to be followed up. In addition "some concentrates from bulk samples remain to be tested for macro-diamonds". Although these concentrates may no longer be available, the comment points to the incompleteness of the previous evaluation programs.
Data derived from published sources