** Shares of ioneer Ltd rise as much as 5.7 pct to A$0.185, their highest since March 27
** The lithium-boron supplier says here the new contracting model struck with SNC-Lavalin Group Inc reduces capex estimate for a sulphuric acid plant at its Nevada, U.S. project by about $60 mln
** Co awarded SNC-Lavalin the engineering and design contract for a sulphuric acid plant at its Rhyolite Ridge Lithium-Boron project
** As of last close, stock has risen about 3 pct this year
Our Standards: The Thomson Reuters Trust Principles.