Geology, mineralogy, and geochemistry of the Cu-PGE (DJ/DB) zone of the Turnagain Alaskan-type intrusion, north-central British Columbia: Supporting databases for the convergent-margin Ni-Cu-PGE study

Convergent margins are becoming increasingly viable tectonic settings for the discovery of mafic-ultramafic intrusion hosted nickel-copper-platinum group element (PGE) mineralization. The ca. 190 Ma Turnagain intrusion in the Northern Cordillera of British Columbia is a mineralized Alaskan-type ultramafic-mafic intrusion. A substantial Ni-Co resource (1842 million tonnes at 0.21% per tonne Ni and 0.013% per tonne Co) has been delineated in what is known as the Horsetrail zone, with additional Cu-PGE potential identified in the DJ/DB zone, which is located 2.5 km northwest of the Ni-sulphide mineralization. This report presents geochemical and mineralogical databases that are the results of work undertaken to characterize the Cu-PGE mineralization at the DJ/DB zone in order to improve exploration models for base metal and PGE deposits. Included are observations of the mineralogy as well as the textures of the mineralization and host rocks in the DJ/DB zone for comparison with those of the Horsetrail zone with the aim to develop exploration criteria for the base- and precious-metal-rich mineralization. Extensive geochemical databases compiled herein include whole rock major element oxide, trace element, and PGE analyses, electron microprobe data for clinopyroxene, amphibole, biotite, Mg-silicate, oxide, sulphide, and platinum group minerals (PGM), in-situ laser ablation ICP-MS analyses of sulphides, and sulphur isotope analyses of sulphides.