** Shares of Dateline Resources DTR.AX rise as much as
25%to A$0.015, its biggest intraday pct gain since Feb. 13
** Stock posts highest level since Feb. 15
** Miner and explorer co says it has mobilised reverse
circulation drill at Colosseum gold mine, California
** Adds Colosseum drilling program is expanded by an
additional 10 drillholes
** About 6.2 mln shares change hands, compared with 30-day
average volume of 3.8 mln shares
** Stock up 40% so far this year, as of last close
(Reporting by Megha Rani)
((Megha.Rani2@thomsonreuters.com;))