** Shares of metal explorer Duke Exploration DEX.AX rise
as much as 4.4% to A$0.095, mark their biggest intraday pct gain
since May 23
** Co says metallurgical testwork conducted at the Bundara
copper project in Queensland demonstrates production of
high-grade copper concentrate at high recoveries urn:newsml:reuters.com:*:nASXNBLwt
** Says future work will explore further improvement and
refinement of the testwork results
** As of last close, stock down 48% this year
(Reporting by Himanshi Akhand in Bengaluru)
((Himanshi.Akhand@thomsonreuters.com;))