March 29 (Reuters) - Thor Mining Plc THRL.L :
* UPDATE ON COMPANY'S INTEREST IN USA LITHIUM PTY LTD
* THOR'S EQUITY INTEREST IN USA LITHIUM NOW STANDS AT 6.25 PERCENT
* HAWKSTONE HAS 14 DAY OPTION PERIOD TO ACQUIRE 100 PERCENT OF SHARES ON ISSUE IN USA LITHIUM FOR CONSIDERATION OF 262.5 MILLION SHARES IN HAWKSTONE