The low grade layer
I've been doing some thinking on mining this stuff.
IF we have like 10-30 g/t in the lowest 0.5m and 1-5g/t in the say 1.5m on top of that.
It would still be highly economical to mine the 2m at the bottom of the conglomerate.
Say 0.5m at 15g/t plus 1.5m at 2g/t = 2m at 5.25g/t
0.5m at 20g/t plus 1.5m at 3g/t = 2m at 6.5g/t
0.5m at 30g/t plus 1.5m at 1g/t = 2m at 8.25g/t
And on and on.
The big plus of mining say 2m is that the variation of the high grade bottom layer is captured, and since the stuff on top of that is still economic (tons of mines who have 1g/t)...
Just an idea though. Not enough bulk samle results to really count on in. Could also be 1 or 2m high grade and 10m low grade.
(sent an email to HH about his value spreadsheet update on this :) )
Imagine we have 10000square km of 2m at 7.5g/t :o