** Shares of the water treatment solutions provider DEM.AX
jump as much as 2.9% to A$0.180, their highest since June 6
** Co signs a three year service contract with mining giant
Rio Tinto RIO.AX urn:newsml:reuters.com:*:nFWN2Y80VG
** Says contract for managing potable water and sewage
treatment plants at RIO's Amrun mine in Queensland
** Adds three-year deal has a value of about A$1.7 million
($1.18 million) in revenues
** Stock down 22.2% this year as of last close, vs a 12.1%
decline in the benchmark S&P/ASX 200 index .AXJO
($1 = 1.4401 Australian dollars)
(Reporting by Roushni Nair in Bengaluru)
((Roushni.Nair@thomsonreuters.com;))