** Shares of Australia's Ramelius Resources RMS.AX fall as much as 3% to A$3.56, their lowest level since March 31
** Gold miner updates FY26 all-in sustaining costs (AISC) estimate to A$1,900–A$2,050 ($1,360.59-$1,468.01)/oz, up from A$1,700–A$1,900/oz previously expected
** Says Dalgaranga commercial production was declared earlier than planned, resulting in additional costs counted under AISC that otherwise would have been treated as growth capital, others
** Stock down 14.2% YTD, including session's moves
($1 = 1.3965 Australian dollars)
(Reporting by Anjali Singh in Bengaluru)
((anjali.singh2@thomsonreuters.com;))