** Shares of Australian Strategic Materials ASM.AX fall as much as 16.8% to A$0.59, its biggest intraday pct. drop since April 23
** Critical metals producer announces share purchase plan to raise about A$3 million ($1.95 million), without disclosing per-share value
** New shares will be issued at 20% discount to volume-weighted average market price for fully paid ordinary shares in ASM, calculated over last 5 days - ASM
** Says funds to be used in progressing co's U.S. metallisation expansion plans, others
** About 593,657 shares change hands, over 1.5x of 30-day average volume of ~384,612 shares
** Stock up nearly 13.2% this year, including the session's moves
($1 = 1.5423 Australian dollars)
(Reporting by Keshav Singh Chundawat in Bengaluru)
((Keshav.SinghChundawat@thomsonreuters.com))