Yukon Geological Survey publication metadata (English, HTML)

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Publisher-reported update

2026-08-26

Porphyry to epithermal deposit models are inferred to best describe the Late Cretaceous Klaza Au-Ag-Pb-Zn-(Cu) deposit. Here we report evidence for a protracted and complex magmatic-hydrothermal system typical of porphyry-epithermal deposits (e.g., multiple magmatic events, magma mingling, relevant vein-alteration types). In the Klaza area, there are at least four compositionally and texturally distinct intrusions interpreted as part of the Casino intrusive suite (ca. 80–76 Ma) that intrude granodiorite country rock of the Whitehorse suite (ca. 105 Ma). A ca. 72 Ma dike swarm (likely Prospector Mountain suite) was emplaced approximately 4–5 m.y. after emplacement of the Casino suite. Evidence of high-T hydrothermal activity consists of early dark micaceous (EDM) veins, sinuous and planar A-type veins, B-type, and D-type veins, and molybdenite-quartz veins. Composite epithermal-type sulphide veins cut high-T Cu-Au-Mo mineralization associated with phyllic and lesser potassic alteration assemblages. The age of porphyry-type mineralization is constrained by 187Re-187Os molybdenite dating to ca. 77 Ma (Kelly) and ca. 71 Ma (Cyprus). The 40Ar-39Ar muscovite dates from phyllic…

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