Eshmun,
A dolerite-hosted orebody would have a specific gravity of 2.7, a BIF-hosted orebody at best would have a specific gravity of ~3.2 in my experience and a massive sulphide orebody a specific gravity of 4. So I think you are materially high in your assumed density.
In the graphic below, I am assuming each blue ore 'panel' is on a 20-metre level. I count at least 20 levels at Beresford and 24 at Allanson. Therefore vertical extent, not withstanding the quoted 70-80 degree dip is 400m divided into 331,000oz Ore Reserve = 827.5ozpvm serviced by 2 declines = 414ozpvm. Still a far cry from my 1,000ozpvm 'rule of thumb' which is pretty robust except in exceptionally high-grade UG mines which these are not.
DYOR
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