Prelim Metallurgical Results

31 Jan 2007 07:01

Metals Exploration PLC31 January 2007 METALS EXPLORATION PLC PRELIMINARY METALLURGICAL RESULTS - RUNRUNO PROJECT London 31 January 2007: Metals Exploration PLC ("the Company") is pleased to announce preliminary results from the metallurgical testwork currently being carried out on two composite samples representing mineralization from the transition and fresh zone in the Runruno deposit. The testwork is being completed at an independent metallurgical laboratory in Australia under the direct supervision of an independent metallurgical consultant. RUNRUNO PROJECT - METALLURGICAL TESTWORK Preliminary tests on the fresh composite using a combination of gravityconcentration followed by flotation have yielded gold recoveries of 92%. Preliminary tests involving gravity concentration followed by cyanide leachinghave yielded gold recoveries of 55 to 60%. This indicates that the gold ispartly refractory, with the unrecovered gold probably being locked withinsulphides. The high gold recovery obtained by flotation is encouraging since flotation isthe preliminary processing stage used in the treatment of refractory gold ores. Tests are currently in progress to assess:(i) whether finer grinding will increase the gold recovery achievable by both gravity concentration/cyanide leaching and gravity concentration/flotation;(ii) the percentage of gold locked within sulphides; and(iii) the gold recovery that can be achieved by gravity concentrationfollowed by flotation and then ultra-fine grinding and leaching of the flotationconcentrate. The calculated gold head grades obtained in the tests completed so far on bothcomposites exceed the expected composite grades calculated from the explorationassays due to the presence of coarse gold. This indicates that current announcedestimates of the gold grade of the resource from diamond drilling have not beenover-estimated, although a far larger statistical sample will be needed beforeany thought could be given to adjusting the grade of the resource as a whole. The first round of metallurgical testwork on molybdenum recovery has been lesssuccessful, and testwork using alternative methods is ongoing. Samples have beensent for mineralogical examination to determine the form in which the molybdenumoccurs and its grain size. Commenting on these results, Jonathan Beardsworth, CEO, said: "These preliminaryresults indicate that the metallurgical testwork is on track. The goldrecoveries, in particular, are encouraging at this stage, although themolybdenum is proving more problematic. We will continue to keep investorsinformed of developments as they occur". Work is now proceeding on several fronts:• Diamond drilling has restarted on the northern extension ofthe deposit with a view to expanding the resource towards our target of 2.5 Mozsas previously indicated;• In-fill RC drilling will soon begin on the main deposit with aview to upgrading part of the resource through Indicated and towards MeasuredResource categories;• Metallurgical testwork is continuing with a view toidentifying the optimum process flowsheet for both gold and molybdenumrecovery; and• A scoping study has just commenced, including conceptual pitoptimization studies, in order to develop project economics. MASAPELID PROJECT Medusa Mining Limited through Phsamed Mining Corporation, in accordance withClause 5.1 of the Masapelid Joint Venture agreement, has given notice to theCompany of its withdrawal from the Masapelid Joint Venture effective 31 January2007. After reviewing the results of their exploration programme and given the Company's current focus on the Runruno Project and the northern Luzon area, the Company in turn, in accordance with Clause 5 of the Memorandum of Agreement, has advised San Manuel Mining Corporation that it is withdrawing from the Agreement effective 31 January 2007. QUALIFIED PERSON Gary Powell (a Director of the Company) has been involved in the mining and exploration industry for more than 20 years. He has a Bachelor of Applied Science degree in geology and is a member of the Australasian Institute of Mining and Metallurgy and the Australasian Institute of Geoscientists. He has compiled, read and approved the technical disclosure in this regulatory announcement. END ENQUIRIES: Jonathan Beardsworth, CEO Metals Exploration +44 20 7927 6690Jonathan Anderson, Investor Relations +44 7863 167070Adrian Hadden , Collins Stewart Europe Limited +44 20 7523 8350Keith Irons, Simon Rothschild, Bankside Consultants +44 20 7367 8888 This information is provided by RNS The company news service from the London Stock Exchange