$23m on alljig gravity circuit - for what?

Ok so Cudeco spent $23 on an Alljig® gravity circuit. What's the pay off?

To extract native copper, CuDeco has built a continuous jigging gravity circuit, designed and constructed in Germany. The Alljig® gravity circuit, built at a cost of ~$23m, is the largest continuous gravity jig circuits in the world, standing 27m high, 25m wide and some 125m in length.

So: Just how much NCu is there really?

Kinda juxtaposed to what some folk have been hammering on about:- as talk of NCu being folly.