** Shares of Australia's Perenti PRN.AX rise as much as 5.5% to A$2.11, their highest level since March 11
** The global miner says its unit Barminco extends existing contract with Regis Resources RRL.AX for underground mining services at Duketon Operations in Australia
** Extension sees Barminco deliver services at Duketon for about A$180 million ($126.88 million) until at least March 30, 2029
** Perenti stock down 24.7%, YTD
($1 = 1.4186 Australian dollars)
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))