** Boss Energy BOE.AX tumbles as much as 39.4% to A$2.060, marks biggest intraday pct loss since April 2008
** Stock hits lowest since March 11
** Uranium miner sees higher costs for its Honeymoon project in FY26 due to decline in average tenor
** Flags operational headwinds for Honeymoon due to "potential for less continuity of mineralisation" for FY27 and beyond
** About 15.1 million shares traded, 2.4x the 30-day average
** YTD, BOE falls ~10%
(Reporting by Nichiket Sunil in Bengaluru)
((Nichiket.Sunil@thomsonreuters.com))