** Shares of gold explorer Tietto Minerals TIE.AX rise as
much as 3.1% to A$0.67, their highest since April 2023
** Chinese gold miner Zhaojin Mining 1818.HK has increased
its buyout bid to up to about A$733 mln ($474 mln)
** Zhaojin had originally bid A$629 mln in October 2023
** The A$0.68 per share offer represents a 60% premium to
Tietto's last closing price on Oct. 27, before the initial offer
was tabled
** Stock has risen 6.6% this year, as of last close
($1 = 1.5463 Australian dollars)
(Reporting by Rishav Chatterjee in Bengaluru)
((Rishav.Chatterjee@thomsonreuters.com;))