Proposed Title 1: - Queen's University

1 cm to 10’s of cm. Fragments of the breccia are highly variable-sized (1 mm to 5 cm) and
consist of angular country-rock clasts embedded in a chlorite-rich matrix (Fig. 2.5K). The
contact between breccia-dikes and the host rock is sharp. A close spatial relationship is
observed between mafic dikes and breccia-dikes.
Late Chl 10 chlorite, Cal 11 calcite veins, and Qtz 5 quartz (Fig. 2.5L) crosscut all rock
types and are parallel to the set of joints.
2.4.2. The Saint Louis fault
2.4.2.1. Geology of the Ace-Fay-Verna deposits
The deposits are located along the Saint Louis fault (Fig. 2.2), which strikes
northeast and dips 50 o southeast (Fig. 2.6). The Ace and Fay ore bodies are located in the
footwall, whereas Verna is in the hanging wall. Sassano (1972) described four units that
host the uranium mineralization named the Fay Mine Complex comprising from oldest to
youngest: quartzite and conglomerates, phyllonite amphibolite, albite paragneiss and
granitic gneiss. These rocks overlie the Donaldson Lake and Foot Bay gneisses and are
uncomformably overlain by the Martin Lake basal conglomerates in the hanging wall of
the Saint Louis fault (Fig. 2.6).
2.4.2.2. Structural and metamorphic relationships in the Saint Louis fault
The Foot Bay gneiss, which occurs in the footwall and hanging wall of the fault (Fig.
2.6B) has a mylonitic texture characterized by rotated augen-shaped Kfs 1 feldspars
porphyroclasts (Fig. 2.7A) surrounded by recrystallized Qtz 1 quartz and layers of Chl 1
chlorite, Bt 1 biotite and Hbl 1 hornblende.
39