** Shares of Agrimin AMN.AX up 22.22% at A$0.165

** Fertiliser development co says it has received Western Australia State environmental approval for its Mackay Potash project

** Says it will now work to secure Commonwealth environmental approval

** Stock rose as much as 25.9% earlier in the day, posting its biggest intraday pct gain since July 9 and hitting its highest since Oct. 15

** Nearly 310,500 shares change hands, 4.2x the 30-day average of about 74,800 shares

** Stock fell 38.1% last year

(Reporting by Jasmeen Ara Shaikh in Bengaluru)

((Jasmeenaraislam.shaikh@thomsonreuters.com))