** Westgold Resources WGX.AX rises as much as 5.8% to A$6.61; set to hit biggest intraday pct gain since January 23
** Gold producer approves Final Investment Decision to expand its Higginsville Gold Processing Hub in Western Australia
** Commits A$145 million ($102.5 million) to expand hub
** YTD, WGX down 1.2%
($1 = A$1.4140)
(Reporting by Aamir Sheik Khalid in Bengaluru)
((Aamir.SheikKhalid@thomsonreuters.com))