Proposed Title 1: - Queen's University

eplaces Kfs 1
feldspars (Fig. 2.7A). The overlying Donaldson Lake gneiss has a
metamorphic assemblage Bt 1 +Pl 1 +Src 1 +Chl 1 +Qtz 1 typical of greenschist grade
metamorphism. The Fay Mine Complex is more deformed than the underlying Foot Bay
and Donaldson Lake gneisses with a mineral assemblage Chl 1 +Src 1 +Ab 1 +Qtz 1 consistent
with lower greenschist facies metamorphism. In the cataclasite and breccia rocks, calcite,
chlorite, quartz, hematite and sericite are the dominant alteration minerals (Figs. 2.7F and
2.7G).
Late Chl 9 chlorite, Cal 11 calcite, Qtz 5 quartz, and Hem 9 hematite veins (Fig. 2.7J) and
mafic dikes cut across the Saint Louis fault.
2.4.3. Paragenesis of the alteration and ore minerals and type of U mineralization
The sequence of deformation and alteration is divided into seven events including six
stages of uranium mineralization, based on petrographic, structural, and age relationships
(Figs. 2.8 and 2.9).
2.4.3.1. Stage 1: Mylonitization
Mylonitization is the earliest deformation observed. The quartzo-feldspathic
mylonite at Cinch Lake and the Foot Bay gneiss at Ace-Fay exhibit recrystallized Qtz 1
quartz around rotated Kfs 1 feldspars. The hornblende-feldspar gneiss at Cinch Lake and the
Foot Bay gneiss at Ace-Fay define an amphibolite metamorphic assemblage
Kfs 1 +Pl 1 +Hbl 1 (Fig. 2.4D). Retrogression to greenschist metamorphic grade is indicated by
the assemblage Bt 1 +Chl 1 +Src 1 +Hem 1 +Qtz 1 . Early Py 1 pyrite, Cpy 1 chalcopyrite and Nl 1
nolanite are stretched along the foliation (Fig. 2.8).
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