it does not have to be out by 100m. if they hit a E-W vein crossing the stratigraphy, they don't have to hit it at the target depth for the VHMS horizon, it could be anywhere in the hole. So they could have got a vein (or swarm thereof) over 40m, well off the contact.
Connect that vein with the others from DD2, and it could be a steep plunging shoot of chalcocite-bornite veins.
Just spitballing, but one would assume that the geos on the rig could get their measurements right.
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