Proposed Title 1: - Queen's University

Syn-ore Chl 7 chlorite in breccia-type U 4 mineralization yields the relatively highest
Fe contents of 25.78 weight percent (Table 3.3; Fig. 3.6C) and high Fe/(Fe+Mg) ratios of
0.53, indicating that the U-bearing fluid was Fe-rich. The average Fe/(Mg+Fe) ratio is
similar to values reported by Tortosa (1983) for Fe-chlorite associated with the
mineralized zone at the Cenex mine. Chl 7 chlorite has a composition typical for chamosite
corresponding to formation temperatures near 330°C (Table 3.3). Cal 8 calcite and U 4
uraninite intergrowths with Chl 7 chlorite in conjunction with high F contents in Chl 7
chlorite, suggest that the U-bearing fluid contained Ca and F (Table 3.3; Figs..3.6A and
3.6B). Electron microprobe and backscattered images show that Chl 7 chlorite was
subsequently altered by fluids that were Mg-rich. These altered chlorites have average
formation temperatures near 195 o C (Table 3.4).
Syn-ore Chl 8 chlorite in volcanic-type U 5 mineralization is an Mg-Fe-chlorite with a
formation temperature of ca. 320°C (Table 3.3). Chl 8 chlorite has the highest Mn and Ti
contents (Table 3.3; Figs. 3.6A and 3.6B), although the presence of Ti and Ca reflects Ttn 3
titanite and Ap 1 apatite grains respectively, intergrown with Chl 8 chlorite and U 5 uraninite
(Fig. 3.4I). Chl 8 chlorites were subsequently altered by later Mg-rich fluids, resulting in
altered chlorites with formation temperatures near 210 o C (Table 3.4). Chl 9
chlorite
associated with the Athabasca-type U 6 mineralization has high Mg and Fe contents (15.43
wt.% and 26.01 wt.%, respectively) and is typically F-Cl-rich (Table 3.3; Figs. 3.6A and
3.6B), with formation temperatures of ca. 235°C (Table 3.3). The Fe/(Fe+Mg) ratio of
Chl 9 chlorite ranges from 0.56 to 0.67 and indicates that the U-mineralizing fluid was
likely Mg-rich.
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