Original metadata (https://open.yukon.ca) (English, HTML)

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Publisher-reported update

2026-09-09

The Guano-Guayes property, in the Pelly Mountains of Yukon, covers a rare earth element (REE) bearing contact metamorphic aureole which developed around a syenite stock during Mississippian time. Sedimentary rocks consist of several hundred metres of Ordovician dark gray shale which are faulted upward adjacent to Silurian interbedded impure calcite and dolomite marbles and quartzites overlain by Silurain quartzite. Sedimentary rocks are on the steeply, west-dipping limb of a regional anticline. The syenite, at the southeast end of a northwest-trending belt of syenite stocks and associated volcanic rocks, consists of 40 to 90 percent orthoclase in laths up to several cm long, and of up to 60 percent mafic minerals now mostly altered to biotite. Rare earth element values of syenite, when normalized to chondritic values, have a crustal pattern with magnitude slightly higher than that of crustal rocks. Dikes, believed to be cogenetic with syenite, intrude sedimentary rocks within and inear the contact metamorphic aureole. These dikes are dark-coloured and originally contained up to 25 percent zircon (now partly altered to secondary minerals). Zircon is enriched in total REE and…

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