** Australian Rare Earths AR3.AX jumps as much as 9.1% to A$0.24; last up 2.3%
** Stock set for strongest session since January 7
** Mineral explorer says test work at Koppamurra Project in South Australia produced high purity Mixed Rare Earth Oxide
** AR3 surged 106.5% in 2025
(Reporting by Sherin Sunny in Bengaluru)
((Sherin.Sunny@thomsonreuters.com))