** Shares of Australia's Whitehaven Coal WHC.AX fall as much as 4.6% to A$6.69, marking their biggest intraday pct. loss since September 3
** Stock hits lowest level since October 15
** Coal producer reports nearly 7% fall in quarterly managed run-of-mine $(ROM)$ coal production
** Quarterly managed ROM coal output of 9 million metric tonnes misses Visible Alpha estimate of 9.3 million metric tonnes
** Stock up 9.5% YTD
(Reporting by Sneha Kumar in Bengaluru)
((Sneha.kumar@thomsonreuters.com;))