Nyota Minerals Regulatory News (NYO)

14 Feb 2006 08:32

Dwyka Diamonds Limited14 February 2006 Dwyka Diamonds Limited ("Dwyka" or "the Company") Bosele update Dwyka, the AIM- and ASX-listed diamond producer and developer, todayannounces that independent diamond consultant Mr. Ray Ferraris has drawnsimilarities between the eight diamonds recovered from a bulk sample taken atDwyka's 70% owned Bosele Project in South Africa and diamonds from WesternAustralia's Argyle Mine. Mr. Ferraris has 29 years of experience in the diamondindustry, including working for both De Beers and Rio Tinto. Having examined the eight diamonds recovered from the most recent test, Mr.Ferraris has advised that they are not typical of those historically extractedfrom the Barkly West/Bellsbank area. Rather, the Bosele stones exhibit minimaloctahedral forms, quite unlike the diamonds from nearby areas. What is veryunusual, apart from the high rates of resorption, is the 'melted' appearance offive of the eight diamonds. This melted appearance is more characteristic ofAustralia's Argyle Mine production, where the diamonds show high degrees ofresorption and a low percentage of octahedral shapes when compared with most ofSouth Africa's kimberlite diamonds. The Bosele deposit lies in close proximity to the Bellsbank kimberlite field, along-term producer of diamonds from both the pipes and fissures. At Bosele, thesurface expression appears to be the crater facies of a large volcanogenicstructure. Crater sediments there include rock fragments derived from geologicalformations that exist well below the current earth's surface. Some of thesefragments are characteristic of deep-seated intrusive bodies derived from thelower crust and upper mantle. The suite of indicator minerals appears to besimilar in nature to diamondiferous lamproite bodies occurring in WesternAustralia. Dwyka has drilled the newly discovered Bosele volcanoclastic body inthree areas, with each drill hole separated from the next by more than akilometre. Although further drilling is required, early indications are that theBosele volcanoclastics intruded a water-rich environment (a similar environmenthas been postulated for Argyle, and the Bosele resedimented volcanoclasticsresemble Argyle's 'sandy' tuffs). Of the two bulk samples recovered at Bosele, the first produced 40 diamonds andthe second eight. However, no attempts were made to recover micro-diamonds so,while the bulk samples were relatively small, the results are significant. For further information please contact the following. In Australia In the United KingdomAdrian Griffin/Melissa Sturgess Laurence Read/Leesa PetersDwyka Diamonds Limited Conduit PR+61 (0) 8 9324 2955 +44 (0) 20 7429 6605/ +44 (0) 7812 159 885 Alternatively, visit http://www.dwykadiamonds.com/ This information is provided by RNS The company news service from the London Stock Exchange