banded jigsaw textures, was observed in 193 samples, and lattice bladed calcite + lattice
bladed calcite replaced by quartz + acicular calcite replaced by quartz was observed in
120 samples. Fluid inclusion assemblages containing coexisting liquid-rich and vapor-
rich fluid inclusions were observed in 193 samples (Fig. 9).
For each of the textures described above, the average Au and Ag grade of samples
in which the feature is present, and the average Au and Ag grade for samples in which
that feature is absent, have been calculated and the results are shown on Figures 10 and
11. The average grade of Au is higher in samples in which the boiling feature is present,
compared to samples for which it is absent, except for the cockade texture silica (Fig. 10).
Also, the most dramatic difference in grade between the presence or absence of that
feature is colloform texture (1.1 ppm Au versus 0.2 ppm Au). And, the average grade is
lower in samples that exhibit non-boiling textures, including massive, zonaland comb
texture quartz and rhombic calcite.
The average grade of silver is higher in samples in which a feature indicative of
boiling is present for all features except for the jigsaw texture quartz. The average Ag
grade is lower in samples that show mineral textures that are indicative of slow crystal
growth (non-boiling), including massive, zonal, cockade and comb texture quartz – the
lone exception is rhombic calcite, which is not thought to be associated with boiling.
Features that show the most dramatic difference in Ag grade between the presence or
absence of that feature are colloform texture silica (178.8 ppm Ag versus 17.2 ppm Ag)
and bladed/platy calcite (128.4 ppm Ag versus 47.5 ppm Ag).
There is no significant difference in average grade of samples containing both
liquid-rich and vapor-rich fluid inclusions, compared to those in which fluid inclusion