** Shares of Altair Minerals ALR.AX rise 23.5% to A$0.021, their highest level since January 11, 2022

** Stock marks biggest intraday pct gain since August 8

** Mineral explorer acquires up to 70% of Greater Oko gold project in Guyana from Adamantium Exploration

** About 18.5 mln shares change hands, 2.7x the 30-day average

** Stock has risen more than eight-fold in value so far this year

(Reporting by Ananya Verma in Bengaluru)

((ananya.verma@thomsonreuters.com;))