** Shares of Syrah Resources SYR.AX fall as much as 7.9% to A$0.173, their lowest levels since March 23, 2020

** The graphite producer has signed a petition alongside several North American graphite co to the U.S. government to investigate dumping of Chinese graphite into the United States at unfair and unsustainable prices

** Co seeks an investigation into Chinese exports of natural and synthetic graphite active anode material used in lithium-ion batteries

** Stock posts its biggest intraday percentage fall since Dec 13

** Stock has fallen 71.6% this year, as of last close

(Reporting by Nichiket Sunil in Bengaluru)

((Nichiket.Sunil@thomsonreuters.com))