** Shares of Golden Horse Minerals Ltd GHM.AX rise 2.6% to A$0.395
** Gold explorer rose as much as 11.7% earlier to A$0.43, marking its biggest intraday pct. gain since June 26
** Co. finds high-grade gold mineralization in areas it previously reported as low-grade at its Hopes Hill project in Western Australia
** Co says discovery may lead to site expansion
** YTD, stock up ~64%, including the session's gains
(Reporting by Shruti Agarwal in Bengaluru)
((Shruti.Agarwal@thomsonreuters.com;))