De Grey Mining Limited is a mining company. The Company is engaged in exploration activities in Australia. The Company's principal activity is minerals exploration at its Turner River Project, located approximately 50 kilometers south of Port Hedland in the Pilbara region of Western Australia. The Turner River Project covers an area of approximately 980 square kilometers. The Turner River Project consists of over 900 square kilometers of gold and base metals tenure covering various portions of the Tabba Tabba Thrust and Mallina Shear Zone, host to approximately three gold and two base metal deposits, with various exploration targets. The Company's tenements include E47/891, E45/2533, E45/2364, E45/2995, E45/3390, E45/3391 and E45/3392. The Company's subsidiaries include Beyondie Gold Pty Ltd, Domain Mining Pty Ltd, Winterwhite Resources Pty Ltd and Last Crusade Pty Ltd.