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Ministry of Energy Mines and Responsible for Core Review

GeoFile 2003-8:  Atlin TGI:  Joss'alun Discovery

Update: Massive Sulphide in Kutcho Arc


by M. Mihalynuk


View GeoFile (PDF, 5.56 MB)


Massive copper sulphide mineralization has been discovered 75 kilometres southwest of Atlin by members of the Atlin TGI. The discovery is best displayed in a 30 metre by 10 metre area where several stacked 3 metre by 1 metre lenses occur. Copper assays up to 9.77 per cent copper are reported from grabs and a 90 centimetre chip sample returned 3.35 per cent copper. The mineralization is massive chalcopyrite with lesser pyrite.  The host is mafic submarine volcaniclastics interbedded with ferruginous cherts of Permian age.  Overlying the beds are quartz bearing clastic rocks with blocks of chert with Middle Triassic fossils and Latest Permian-Early Triassic detrital zircons.  The mineralization is similar to the Kutcho deposits to the southeast.


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