Hi Charl,
I use specific gravity (SG) of 3.2, not sure if you use density same as I am using specific gravity. I have been speaking with two geos (not on HC) one who has significant Isa experience and recommendation was SG of 3.2 - 3.5 so I used 3.2.
so 300*500*25*3.2 = 12mt.
To try and balance me on bias I have lower and upper estimations as well.
my upper is 16mt (400*500*25*3.2 S.G)
my lower is 6.75 mt (300*300*20*3 S.G)
cheers
Ann: Mount Hope Discovery - 37m @ approx. 5% Copper, page-183
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