** Shares of Pioneer Minerals PMM.AX rise as much as 20.6% to A$0.205, logging their biggest intraday pct gain since March 10
** The exploration firm says drilling results confirm presence of gallium across Springfield prospect at its North Pine project in the United States
** Adds that results confirm presence of critical mineral system comprising tungsten, precious metals
** Stock up over 45% this year, including the day's move
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))