Archean deposits mined for gold in Canada do Very Well. One example, added to the historic Discovery,Con, and Giant Mines (14 million gold ounces produced) at Yellowknife, is Detour Lake with over 11 million ounces in reserves. Look here,
http://www.detourgold.com/PROJECTS/Detour-Lake/default.aspx
Oh, did I mention that Tyhee's deposits are Archean?