Mineralogical study of the platinum-group element distribution and associated minerals from three stratigraphic layers, Bird River Sill, Manitoba / L.J. Cabri and J.H.G. Laflamme. : M38-13/88-1E-PDF

"A preliminary mineralogical investigation of a total of nine hand samples from the Upper Main Chromitite, Lower Main Chromitite and the Lower Group platinum-bearing zone (Scoates et al., 1987) has shown a contrasting distribution of platinum-group elements. The Upper and Lower Main Chromitites contain laurite as the principal platinum-group mineral (PGM), followed by Os-Ir-Ru alloys, rare erlichmanite, irarsite and an unidentified PGM. Chromite is host to 43 vol % of the PGM; the balance occurs as inclusions in silicates (mainly clinochlore). In contrast, nine PGM occur in the Lower Group platinum-bearing zone, the most common of which are sperrylite and laurite. Kotulskite, merenskyite, hollingworthite, keithconnite and irarsite are less common, and mertieite II and another unidentified PGM are even more rare. Also, in contrast to the stratigraphically higher chromitites, 99 vol % of the PGM in the Lower Group platinum-bearing zone are included in silicates or sulphides, with the remaining 1 vol % in chromite and magnetite"--Abstract, p. i.

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