RE: Assays Fantastic19 Mar 2021 10:19
Jolly, re deeper 600m, ...The deeper your pit gets, the (way) more irrelevant rock you have to move out of the way in order to get at it, therefore the higher your costs. .3% Cu is meh, it can't pay for a superpit. Then if it needs underground mining methods instead, you're generally looking at 1%?Cu to be a go-er with high volume block caving, but then the geometry of this orebody is all wrong for that anyhow! And U/g is far more labour intensive, and in Australia even the guy peeling the potatoes is on &100 grand a year (my keyboard has no pound symbol,) so you need much richer ore to justify u/g operations...see Grasberg, Oyo Tolgoi, Solgold etc.