My understanding is that they were not moving up to test the other zones....they were testing the lowest zone to see what they actually had (seeing it wasn't planned).
Week 46 Wrap: Copper hits 2mth low as Trump threatens net zero pace; US rally fades; HotCopper’s picks
CUF CuFe sells its Crossroads gold royalty to Northern Star for $4M cash; says better than waiting for mine launch