The geochemistry of rhenium, with special reference to its occurence in molybdenite

Little has been added to our knowledge of the geochemistry of rhenium since the work of Noddack and Noddack (16) in 1931, except that many determinations have been published of the rhenium content of molybdenite, the only present source. These determinations, 150 in all, have been as-sembled. The rhenium content of molybdenite ranges from none to 3,250 ppm Re, and varies widely, even in samples from a single deposit. No generalizations are yet possible as to correlations of rhenium content with geological conditions of formation. Other possible sources of rhen-ium are considered briefly