** Shares of Australia's Boab Metals BML.AX rise as much
as 13% to A$0.13, climbing for the fourth straight day
** Metal miner says it sees positive signs from drilling at
its Sorby Hills Lead-Silver-Zinc Project in Western Australia
** Says drilling has found zinc-lead sulphide mineralisation
in an area and at a depth where no mineralisation has been found
before
** Stock hits its highest level since Oct. 31
** Stock down 61.7% YTD, based on last close
(Reporting by Aaditya Govind Rao in Bengaluru)
((Aaditya.govindrao@thomsonreuters.com;))