** Shares of Talga Group rise as much as 16% to A$0.435, their biggest intraday pct gain since mid-June

** Battery materials developer says co granted graphite exploitation concession for 25 years by the Mining Inspectorate of Sweden for Nunasvaara South mine

** Says concession is a key step in production of the critical mineral in the EU

** Stock hits highest level since Sept. 16

** More than 2 mln shares change hands vs 30-day avg volume of 1.1 mln shares

** Talga down 46.5% YTD as of 0444 GMT

(Reporting by Nikita Maria Jino in Bengaluru)

((Nikita.Jino@thomsonreuters.com;))