** Canada-based mineral exploration company Regulus
Resources Inc's shares REG.V rise 8.6% to 89 Canadian cents
** Rio Tinto's RIO.AX entity Nuton invests $15 mln (about
C$20.5 mln) in REG urn:newsml:reuters.com:*:nGNX4q4r8G
** REG is completing the private placement at a subscription
price of C$1.02/shr
** Upon closing, Nuton will own about 16.5% interest in REG
** "Through Nuton, Rio Tinto has developed sulphide leach
processing technologies that could allow for the processing of
high arsenic ores without the need for additional on-site
treatment or paying heavy penalties to a smelter," says REG's
CEO John Black
** Utilizing the Nuton sulphide leach technologies could
truly be a game-changer for the AntaKori deposit - REG CEO
** Accounting for session gains, REG's stock down 17.6% YTD
(Reporting by Arshreet Singh in Bengaluru)
((Arshreet.Singh@thomsonreuters.com))