Australia's Iluka Resources slumps on below-par quarterly production

** Shares of Iluka Resources ILU fall 8.1% to A$4.9, their lowest level since Dec. 23

** The critical minerals miner posts zircon/rutile/synthetic rutile sales of 136 KT in second quarter, 12% below Citi's estimates

** Co also logs mineral sands revenue of A$290 million in second quarter, 17% below Citi's estimates

** Stock fell as much as 9.2% earlier in the day, marking its worst intraday drop since Dec. 6

** Stock down over 3% this year, including the day's move

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