• Shares of Australia's Fitzroy River rise as much as 6.7% to A$0.240, hitting their highest level since mid-July 2014

• Shares mark their biggest intraday pct gain since June 5

• Oil and gas mineral investment holding co appoints financial adviser for potential divestment of royalty interest in Bowdens Silver Project, Australia

• More than 438,700 shares change hands, about 6x the 30-day average

• YTD, stock up 50%, including session's moves

(Reporting by Subhalakshmi Dey in Bengaluru)