GeoFile 2012-08: Mesozoic Magmatic History and Metallogeny of the Hotailuh Batholith (NW BC)
Mineral Exploration Roundup 2012 Poster
View GeoFile 2012-08 (PDF, 3.5 MB)
The composite Late Triassic to Middle Jurassic Hotailuh batholith occupies 2275 km2 at the centre of the Stikine arch, close to the northern margin of the Stikine terrane in northwestern BC. We present the preliminary results of detailed mapping, geochemical and geochonological sampling aimed at refining the temporal magmatic evolution of the batholith, and building a metallogenic framework that relates mineralization to magmatic events. The project is part of the Geoscience BC funded QUEST-Northwest program developed to stimulate mineral exploration in the northwestern part of the province.
This study confirms that the Hotailuh batholith is prospective for intrusion-related mineral deposits that formed during at least two mineralizing events – an older event at ca. 220 Ma and a younger event at ca. 170 Ma. The Late Triassic calc-alkaline metallogenic event produced the Gnat Pass porphyry Cu and several other Cu and Cu-Au occurrences on the edges of the Hotailuh batholith, and may be temporally related with Cu mineralization at Schaft Creek further to the southwest. Newly discovered mineral occurrences in Middle Jurassic calc-alkaline plutonic rocks represent a relatively unrecognized metallogenic event that deserves more attention.
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