LONDON (Dow Jones)--Red Rock Resources PLC (RRR.LN) said Tuesday that following the death the Jupiter Mines Limited (JMS.AU), Chairman, Geoff Wedlock, in a plane crash Saturday, Brian Gilbertson will join the JMS board forthwith as a non-executive director and will also temporarily assume the position of Acting Non-Executive Chairman. -Red Rock Resources shares at 0919 GMT down 0.02 pence, or 1.2%, at 2.05 pence. -Jupiter Mines Ltd shares at 0919 GMT up 0.89 pence, or 6.52%, at 14.57 pence. -By Iain Packham, Dow Jones Newswires; 44-20-7842-9269; [email protected] (END) Dow Jones Newswires June 22, 2010 05:23 ET (09:23 GMT)