• Shares of Greatland Resources rise as much as 7.2% to A$12.995, their highest level since June 24

• Stock logs its largest intraday pct gain since June 15

• The diversified miner says its group ore reserves contain more gold than expected, lifts estimate by 62% to 5 million ounces, as at March 31

• Miner's portfolio includes the Telfer-Haverion gold copper complex in Western Australia

• Stock up 15.7% YTD, including the day's moves

(Reporting by Nikita Maria Jino in Bengaluru)