** Shares of Australia's Hammer Metals HMX.AX rise 42.3% to A$0.037, their highest level since July 7
** Stock posts its biggest intraday pct gain since mid-January 2021
** Copper-gold miner finds gold mineralization at Bronzewing gold mine in Western Australia
** Around 5.2 mln shares change hands, 8.7x the 30-dav avg
** YTD, stock up 12.1%, including the day's gains
(Reporting by Shruti Agarwal in Bengaluru)
((Shruti.Agarwal@thomsonreuters.com))