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MEGWA Monthly Meeting – MarchTalkJaguar Nickel Deposit, Carajás – the world’s largest and oldest (?) hydrothermal nickel sulfide deposit By Grant Alan “Rocky” Osborne The Jaguar Nickel Deposit with a Global Mineral Resource Estimate totalling 108.0Mt @ 0.87% Ni for 938,500 tonnes of contained nickel is one of the largest nickel sulphide resources held by an ASX-listed company and the largest outside of the major mining companies, but it differs from most nickel sulfide deposits mined to date because it is of hydrothermal origin with the mineralization being of high nickel tenor (i.e., wt% Ni in 100 wt% sulfide) with low Cr and Mg contents, and not directly associated with mafic-ultramafic rocks. Compared with other hydrothermal deposits the Jaguar deposit is not associated with ophiolite complexes or black shales, nor does it represent local remobilization from magmatic Ni-Cu sulfides. Instead, it developed at greater crustal depth within a crustal scale fault in dacite. It is interpreted the Jaguar mineralization represents a hybrid hydrothermal style between magmatic Ni-Cu-PGE and IOCG mineralization and is of NeoArchean to PaleoProterozoic age.
Grant Alan “Rocky” OsborneConsultant, GEOSBORNE Pty Ltd & Principal Geoscientist, Centaurus Metals Ltd Rocky graduated from the South Australian Institute of Technology (now known as the University of South Australia) with a Bachelor of Applied Science degree in Applied Geology in 1979. He worked for BP Minerals from 1979 until 1989 in Australia and Brazil as mine geologist and exploration geologist and was responsible for the discovery of the Rocky’s Reward nickel mine in WA in 1985 and the Santa Helena (formerly C2C) Zn, Cu, Ag mine in Brazil in 1986, as well as occupying the position of Geology Manager at the Cabaçal I gold mine in Brazil. In 1989 he joined WMC in Brazil as senior geologist rising to the rank of Principal Geologist, leading the teams responsible for the discovery of the Boa Vista nickel deposit (1994) and the Sertão gold mine (1997) and was involved in global nickel sulphide targeting in Africa, Canada, China, and South America. From 2006 to 2009 he joined the Mitchell River Group as Chief Geologist for the affiliated companies Albidon Limited in Zambia and Mirabela Nickel Limited in Brazil. Subsequently he occupied the role of Principal Geologist with Emmerson Resources Limited until 2014 when he became a consultant with GEOSBORNE Pty Ltd. Rocky has consulted to Centaurus Metals in Brazil on Au, IOCG and Ni targets since 2015 and has been involved with the AIG Mentor program since its initiation.
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