Bearing in mind that at the current price of copper, copper...

Bearing in mind that at the current price of copper, copper grade cut-offs not previously considered, are now very profitable.

The May 2015 ore resource reports the cutoff as 0.2% Cu. Which is a copper equivalent cutoff.

Now based on the 2020 Feasibility Study Update published on their website, the marginal cut based on today's spot prices is

Marginal Cutoff
= (Processing + G&A)* Exchange Rate/(Copper price x Processing Recovery)
=((10.43/tonne+1.92/tonne))*0.78/(US$4.44/lb x 92% x 2204lb/tonne)
=0.0010699
=0.107%

So with a cutoff today, half of what was assumed in 2015 I would have to say there must be some mineralised waste that is now profitable. But without knowing what the grade/tonnage curve looks like it is impossible to say how much more.