Report (English, PDF)

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Publisher-reported update

2026-08-26

New geological mapping around the Fyre Lake Cu-Co-Au deposit in Yukon-Tanana Terrane, southeastern Yukon, has established the continuity of stratigraphic units from nearby Grass Lakes map area and affirmed the stratigraphic context of the deposit. The deposit is located near the top of a regionally persistent chlorite schist and phyllite unit that is spatially associated with voluminous mafic and ultramafic intrusive rocks. As in Grass Lakes map area, chloritic schist and associated mafic and ultramafic meta-intrusive rocks in the Fire Lake area overlie a regionally persistent quartz-rich metaclastic and carbonate unit and underlie a thick carbonaceous phyllite unit with lesser marble and felsic meta-volcanic rocks. Yukon-Tanana Terrane rocks are truncated to the east by a shear zone of mylonitic Mississippian granite that lies at the base of the Money Klippe. The klippe is composed of undeformed (except in the shear zone) Mississippian granite and granodiorite of the Simpson Range Plutonic Suite and their wall rocks and roof pendants. Wall rocks and pendants include meta-sedimentary, meta-volcanic and meta-intrusive rocks. Layered wall rocks include a lower quartz-rich…

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