** Shares of Greatland Resources GGP.AX rise as much as 12.3% to A$8.48, their highest level since October 21
** Stock set for its strongest trading session in over two months
** Top gainer on benchmark index .AXJO, which is down 0.42%
** Gold and copper producer says it completes feasibility study for its Havieron project in Western Australia
** Study confirms pathway for gold-copper mine development, which co will integrate with its Telfer project
** Subiaco-based firm expects steady state average production target of 266koz gold and 9.6kt copper annually
** Stock up 6.3% since trading debut on June 24
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))