** Shares of Australia's Sultan Resources SLZ.AX rise as
much as 15.9% to A$0.051, hitting highest since May 24
** The mineral explorer enters a joint venture agreement
with a unit of Rio Tinto RIO.AX
** Co adds that venture agreement is for a portion of co's
Lake Grace tenure and allows Rio's unit to undertake preliminary
exploration and then earn an 80% interest by way of A$2 mln
($1.36 mln) of exploration spend within 5 years
** Stock down 48.2% this year, as of last close
($1 = 1.4732 Australian dollars)
(Reporting by Nausheen Thusoo in Bengaluru)
((Nausheen.Thusoo@thomsonreuters.com;))