** Shares of Australia's Orion Minerals ORN.AX fall as much as 5% to A$0.019, posting their biggest intraday pct drop since September 25
** Diversified miner says it has received additional commitments to increase capital raising to A$7.7 million ($5.09 million) from A$5 million at an issue price of A$0.015 per share
** Issue price represents a discount of 25% to stock's last close
** Stock has risen 26.7% so far this year
($1 = 1.5142 Australian dollars)
(Reporting by Roshan Thomas in Bengaluru)
((Roshan.Thomas@thomsonreuters.com;))