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porphyry and coated by Chl 1 forming thin needles injecting into the Qtz 2 vein. Hem 1 occurs as
inclusions in Qtz 2 and as fine grains replacing Chl 1 needle. (E) Highly altered quartz-feldspar
porphyry showing Hem 1 and Chl 1 as replacement of Src 1 in the matrix. (F) Altered quartzfeldspar
porphyry showing Cal 1 as replacement of Src 1 in the matrix.
4.5.1.1.2. Uranium and gold mineralization
Following the pre-ore alteration stage, the host rocks of the Coronation Hill deposit
were brecciated and mineralized. Mineralization consists of U 1 uraninite, Au 1 gold and Gn 1
galena confined to zones that were mostly affected by the pre-ore alteration. Cross-cutting
relationships show that the ore assemblage crosscuts and obliterates the pre-ore mineral
assemblage. Mineralized breccias typically comprise sub-angular and altered quartzfeldspar
porphyry fragments cemented by U 1 uraninite (Fig. 4.6A) that occurs as massive
grains occupying open space in the matrix or as veins crosscutting the pre-ore assemblage
minerals.
U 1 uraninite is associated with Cal 2 calcite, Chl 2 chlorite, Hem 3 hematite (Fig. 4.6B),
and Ms 2 muscovite (Fig. 4.6C). In places, U 1 uraninite coats or replaces Py 1 pyrite grains
(Fig. 4.6D). U 1 uraninite is also disseminated in the granophyre, wherein it is associated
with Chl 2 chlorite, Cal 1 calcite, and Hem 2 hematite. U 1 uraninite is associated with the
assemblage Gn 1 Galena- Au 1 gold- Cpy 2 chalcopyrite (Fig. 4.6E). Gn 1 galena occurs as fine
white crystals, typically less than 50 μm across, or generally as massive euhedral to
anhedral grains greater than 1 mm in size.
Crystals of Gn 1 galena are intimately intergrown with U 1 uraninite, native Au 1 gold
and Cpy 2 chalcopyrite (Fig. 4.6E). Native Au 1 gold forms subhedral grains typically ca. 10–
150