ALLSMAN P T 1940 RECONNAISSANCE OF GOLD MINING DISTRICTS INCK HILLS S DAKOTA BUMINES BULL 427 P 40CONNOLLY J P AND OHARRA L C MINERAL WEALTH OF THE BLACK HILLCHOOL OF MINES BULL 16 PP 145 146IRVING J D AND OTHERS 1902 ECONOMIC RESOURCES OF THE NORTHERHILLS USGS PP 26 PP 163 169 AND 211-212.RUNNER J J AND HARTMANN M L THE OCCURRENCE CHEMISTRY METALLUUSES OF TUNGSTEN WITH SPECIAL REFERENCE TO THE BLACK HILLSH DAKOTA:S DAK SCHOOL OF MINES BULL 12 1918 PP 74 75.S DAK STATE PLANNING BOARD 1936 TUNGSTEN MINING IN SOUTH DAK3,11,15,19,29.SOUTH DAK STATE MINE INSPECTOR ANNUAL REPORTS FOR 1915,1916,U S BUMINES STAFF REGION V BLACK HILLS MINERAL ATLAS S DAK PCIRC 7688 P 75