MOORE, HARRY A., EAST COEUR D'ALENE MINING DISTRICT, MONTANA? THE MINING WORLD, P. 272, 8/13/10THE EXPLORATORY WORK TO DATE IN 1910 EMBRACES A 400 FT UPPER DRIFT TUNNEL, LOWER CROSSCUT TUNNEL 400 FT., 600 FT. OF VEIN DRIFTING AND 150-FT SHAFT FROM LOWER DRIF