** Shares of Pantoro Gold PNR.AX rise as much as 4.9% to A$5.13, hitting their highest level since January 30
** Stock marks strongest intraday gain since February 9
** Gold producer announces on-market share buyback of up to 10% of its ordinary shares
** Buyback to be conducted over next 12 months
** YTD, stock up 4.8%, including the day's moves
(Reporting by Shivangi Lahiri in Bengaluru)
((shivangi.lahiri@thomsonreuters.com))