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West African Diamond - re: Geophysical Survey

RNS Number:6097O West African Diamonds PLC 25 February 2008 25th February 2008 WEST AFRICAN DIAMONDS PLC RESULTS OF DETAILED GROUND GEOPHYSICAL SURVEY OVER THE DROUJBA KIMBERLITE PIPE IN GUINEA Main Droujba kimberlite pipe larger than originally thought Potential 100% increase in size of the Droujba pipe Several new possible kimberlite pipe exploration targets identified within the vicinity of Droujba The board of West African Diamonds plc, the AIM listed diamonds and precious metals explorer and developer (AIM: WAD), is pleased to provide an update on its exploration activities in Guinea. A suite of the most up to date ground geophysical surveys was conducted over the Droujba kimberlite pipe and satellite Katcha dykes during December 2007 by a specialist geophysical contractor from South Africa. A grid of 1000 x 1000m was laid over the main Droujba kimberlite pipe. The grid was oriented to take into account shape and expected size of the ore body as well as local geology based on available information and ground observations on site. Traverses were in a north/south direction taking into account the strike and orientation of the Koiyang - Kolokoro dyke systems. The geophysical methods included, Controlled Source Audio Magneto-Tellurics (CSAMT), Ground Magnetics, Electro-Magnetics (EM) and Gravity. The table below summarises the main parameters for each method. GEOPHYSICAL METHOD No OF LINES STATION SPACING LINE SPACING TOTAL NO. STATIONS CSAMT 41 25 25m 1681 GRAVITY 41 25 25m 1681 ELECTROMAGENETICS (EM) 41 25 25m 1681 GROUND MAGNETICS 41 5 25m 7626 The resultant data was analysed, interpreted and used in the production of a geophysical representation of the geology of the Droujba kimberlite pipe and the surrounding areas. The data analysis and interpretation was completed in January with three technical reviews being held. These included reviews undertaken by Mr EO Kostlin and Dr D.Sutherland, international experts in their respective fields of geophysics and West African geology. The key outcome of the survey confirms that the shape and size of the Droujba pipe appears to be larger than initially thought. From the results of the survey, the probable size of the kimberlite seems at least twice as large as the previously postulated size of 0.6ha (based on the area of the current water filled open pit). Parts of this potential extension could have eluded detection in the past because of the complex geology in combination with historical exploration technologies. In addition, two new signatures characteristic of kimberlitic vents or satellite pipes were discovered. Further, two new elongated magnetic bi-polar shapes with signatures similar to kimberlitic dykes or small kimberlite blows were also highlighted. These new potential targets have been ranked for drilling to test for the existence of kimberlite. This release has been approved by Alex van Zyl, Technical Director, West African Diamonds. Alex van Zyl (B.Sc. Stellenbosch, B.Sc. Hons. Pretoria) spent a long career in Anglo American in the diamond division, ending up 1990 to 1997 with worldwide responsibility for diamond exploration and evaluation. He was a consultant to De Beers from 1997 to 2002. James Campbell, Deputy Chairman, said: 'Following a detailed review of the data on the Droujba kimberlite and environs by Dr Donald Sutherland, it became apparent that further study of the high-grade Droujba kimberlite pipe could prove highly value enhancing. The WAD board decided to invest in a comprehensive ground geophysical survey as a prelude to identifying drilling targets. The survey has been successful not only in terms of potentially doubling the size of the kimberlite pipe, but also finding four new 'kimberlite indicative targets within close vicinity of the Droujba pipe. A proposal to undertake a drilling programme on the main Droujba and satellite pipes will shortly be presented to the WAD board, with the target of proving what we believe to be considerable geological and eventually monetary potential. ' Enquiries: West African Diamonds John Teeling, Chairman + 353 1 833 2833 James Campbell, Deputy Chairman +27 83 457 3724 Blue Oar Securities Plc John Wakefield +44 (0) 117 933 0020 College Hill Paddy Blewer +44 (0) 20 7457 2020 Nick Elwes www.westafdiamonds.com This information is provided by RNS The company news service from the London Stock Exchange END MSCFKBKDOBKDKBB

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