** Shares of Australia's St. Barbara SBM.AX fall as much as 6.9% to A$0.68, on track for their worst session since March 23
** Gold miner posts Simberi's third-quarter gold production of 13,522 ounces vs 14,053 ounces reported a year ago
** Anticipates Q4 gold production for the New Semberi Gold Project of 14,000-17,000 ounces, compared to 14,620 ounces a year earlier
** Stock up 20.7% YTD, including the session's moves
(Reporting by Anjali Singh in Bengaluru)
((anjali.singh2@thomsonreuters.com;))