RECONNAISSANCE FOR URANIUM IN THE INDIANA COAL FIELD

摘要

A radioactivity of 6.001 or more percent equivalent uranium was found in five Indiana coal beds;the Upper Block, Minshall, Gentryville, Coal V, and Coal VII, The radioactive coal is local and the reserves are small. The radioactivity is in the top part of the bed in the thick coals. Most of the radioactive coal has a high percentage of ash. The black carbonaceous shale above Coal V and the Minshall coals contains about 0.006 and 0.003 percent equivalent uranium respectively, and the radioactivity appears to increase as the amount of organic matter increases in the shale. The black shale above Coal V is widespread in Indiana and adjacent states and the reserves of shale are large.