** Heavy Rare Earths HRE.AX rises 2.4% to A$0.042; marks biggest intraday pct gain since July 28
** Rare-earths explorer inks agreement with Havilah Resources HAV.AX to buy "one of South Australia's largest known tin projects" in Prospect Hill
** YTD, HRE gains ~36%
(Reporting by Rajasik Mukherjee in Bengaluru)
((Rajasik.Mukherjee@thomsonreuters.com))