** Shares of Australia's Viva Energy VEA.AX fall as much as 9.5% to A$2.29, their lowest level since March 19
** Stock marks biggest intraday pct drop since April 8
** VEA resumes trading after going on halt on Thursday following a fire at its Geelong refinery
** Expects refinery to produce diesel and jet fuel at around 80% of capacity and petrol at around 60% in short term
** Posts nearly three-fold jump in first-quarter Geelong refining margin
(Reporting by Sneha Kumar in Bengaluru)
((Sneha.kumar@thomsonreuters.com;))