A quantitative spectrographic technique has been developed to determine platinum and palladium in the common sulphides pyrite, pyrrhotite, pentlandite, and chalcopyrite and in mixed arsenides, chiefly niccolite, gersdorffite and maucherite, in ores of the Sudbury district. This involves concentration by fire assaying and mixing resulting beads with gold amalgam.The results of both qualitative and quantitative spectrographic analyses on various minerals are given and discussed, and the conclusion is reached that most of the platinum and palladium may be present in discrete mineral particles, some of submicroscopic size, in all of these minerals. It is also indicated that a noteworthy amount of the metals has been deposited with the early sulphides and that they are by no means confined to a late, less intense, stage of mineralization.

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