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Department of Mineralogy, Eötvös Loránd University, Pázmány Péter Sétány 1/c, Budapest 1117, Hungary
Department of Earth Sciences, Carleton University, Ottawa, Ontario, Canada K1S 5B6
Department of Mineralogy, Eötvös Loránd University, Pázmány Péter Sétány 1/c, Budapest 1117, Hungary
Department of Earth Sciences, Carleton University, Ottawa, Ontario, Canada K1S 5B6
Corresponding author: e-mail,
kszentpeteri{at}hotmail.com
Three deposits (the offset sublayer 100 and 120 orebodies, and contact
sublayer Lady Violet deposit) in the Copper Cliff North mine area, Sudbury, were
sampled with the aim of defining the mineral assemblages. The ores are composed
of pyrrhotite-pentlandite-chalcopyrite with minor titanomagnetite, ilmenite,
accessory sulfarsenides, Bi-Te minerals, and sperrylite. Sulfarsenides, which
are prominent accessory minerals, contain the platinum-group elements (PGE) Rh,
Ru, Ir, Os, and Pt in decreasing order of abundance in solid solution. Some
zoned sulfarsenide crystals have PGE concentrated in the centers, decreasing
toward the edges. Nickeliferous cobaltite, the common sulfarsenide, contains as
much as 16 at. percent 
PGE.
Hollingworthite ((Rh,Ru)AsS), which occurs as cores or distinct crystals
enclosed in cobaltite, is a newly recognized occurrence in the 100, 120, and
Lady Violet deposits in the Sudbury South Range. Formation of primary
PGE-bearing sulfarsenides is related to exsolution from monosulfide solid
solution at about 550° to 600°C. During late crystallization, aqueous fluids
interacted with the rocks, resulting in precipitation of hydrous silicates
(epidote, biotite, chlorite) and remobilization of PGE-bearing sulfarsenides.
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