Extract from MINFILE 093L 191:
Development status: Undeveloped Prospect
Name: THEZAR 81 (EAST), LENNAC LAKE
Lower Jurassic Hazelton Group volcanics comprised of andesite, andesitic to rhyolitic tuff, breccia, minor argillite and conglomer- ate dip gently northeast. The volcanics are intruded by an Early Tertiary quartz diorite porphyry with related biotite-quartz diorite dikes and quartz-hornblende-biotite-feldspar porphyry dikes. East of the property, Triassic Takla volcanics discordantly overlie the Hazelton Group. The Takla rocks are comprised of chert, volcanic and sedimentary breccia, massive dacitic to andesitic flows and tuff.
The East Zone is characterized by a series of copper showings in the Hazelton rocks. The volcanics are typically weakly propylitized, weak to intensely bleached and pyritic (2 to 4 per cent). Bleaching is a combination of argillization and silicification of the rock. Fine to medium-grained pyrite, chalcopyrite and magnetite with minor hematite and sphalerite (?) occur predominantly along fractures or are disseminated in the host rock. A stockwork of mineralized quartz- calcite veins and veinlets crosscut the volcanics and host pyrite and chalcopyrite mineralization. Malachite staining occurs along fractures.
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