** Shares of Yari Minerals YAR.AX rise as much as 22.2% to A$0.011 in their biggest intraday pct since October 23
** Stock hits highest level since November 18
** Specialty miner reports thick coal seams at co's Rolleston South project in Queensland
** Says drilling results indicate clean, high-yield coal with potential low-ash, semi-soft metallurgical characteristics
** Stock has more than tripled in value this year, including the day's moves
(Reporting by Nikita Maria Jino in Bengaluru)
((Nikita.Jino@thomsonreuters.com;))