I think the Courageous Lake property owned by Seabridge Gold (SA), with its mult-million ounce resource gold deposit (+11Moz), is the biggest one in the NWT. They're now doing a pre-feasibility study.
http://www.seabridgegold.net/readmore.php?newsid=312
http://www.seabridgegold.net/readmore.php?newsid=317