** Shares of Greenvale rise as much as 17.2% to A$0.034, posting their biggest intraday pct gain since late October

** Mineral explorer acquires 80% stake in Elkedra uranium project in the Northern Territory

** Says project is highly prospective for uranium; will complement its other projects in the region

** Stock had fallen 69.5% this year, as of last close

(Reporting by Namrata Verma)

((Namrata.Verma@thomsonreuters.com;))