** Shares of Australian Mines AUZ.AX rise as much as 20%
to A$0.018, their highest level since Sept. 4, 2023
** Stock posts its biggest intraday pct gain since Feb. 14
** Producer and supplier of technology metal materials says
it has increased exploration footprint in Bahia state, Brazil
** Says it has acquired 17 new tenements in Bahia
** About 24.5 mln shares change hands, compared with the
30-day average volume of 17.5 mln shares
** Stock up 70% YTD, as of last close
(Reporting by Megha Rani)
((Megha.Rani2@thomsonreuters.com;))