Ha! Well there you have it folks. Irrefutable proof (if you needed more) that fmx hasn't got the remotest clue what he's talking about. A wannabe geo. Fresh rock is fresh rock whether it's at surface or 2 kilometres down. 50 metres is nothing for the scale of this deposit.
The hydrothermal alteration and mineralisation at Ema and TE occurred under pressure at depths of a few kilometres before it was exposed at surface.
50m is a speck on this schematic.