I read it as already 1350' deeper into the "stratigraphy" when the drill bit made its' first turn on that hole.
It would appear to me that the decision to move to that point. 0.6 east was based on info. / knowledge / interpretation of known data, and that indicates some pretty sophisticated or skilled operators. It could also have been luck or a hunch and I'll take that as well.
I do remember JB saying something about porphyries(sp?) sometimes tipping over, so to speak, which could account for the difference in depth before hitting the indicators.
He also mentioned 'isoclonic(sp?) folding', as a concern, probably because such could be a variable to depth from the surface of mineralization.