POWERS, J.B. BRIEF HISTORY OF THE FORTYMILE MINING DISTRICTTO 1935. AK. TERR. DEPT. OF MINES MINER. REP. MR 60-2, 193519 PP.BURLEIGH, R.E., AND K.G. LEAR. COMPILATION OF DATA FORPHASE 1 OF THE MINERAL RESOURCE EVALUATION OF THE BUREAU OFLAND MANAGEMENT BLACK RIVER AND FORTYMILE RIVER SUBUNITS.BUMINES OFR 48-94, 1994, 166 PP.ALASKA KARDEX 060-258