** Shares of Great Boulder Resources GBR.AX rise 5.9% to A$0.072
** Stock rose as much as 7.4% to A$0.073 in early trade, its largest intraday pct gain since mid April
** Mineral explorer reports high-grade mineralisation of gold at Ironbark deposit in its Side Well project in Western Australia
** Says drilling results provide an extension of Ironbark's current resource area
** Stock up 67.4% YTD, including current session's moves
(Reporting by Nikita Maria Jino in Bengaluru)
((Nikita.Jino@thomsonreuters.com;))