No.
I think if you have designed the hole with a 200m margin of error in mind as to the depth (so, your model says 600 and you go to 800) and you're getting blebby sulphides, you'd have to make a choice between pushing well beyond the modeled conductor and just starting a new hole 400m along strike.
You'd make this choice based on the lithologies you are getting from the hole. You could see a change in lithology (and hence chemistry) which is favorable. Say, a new sub-intrusion or layer or phase of the intrusion, and this can give you an idea of the way up or down (bearing in mind you're looking for a basal position and it might be overturned) but they should have an idea by now based on previous holes.
But really...you are chasing a chonolith, or a pipe within the main intrusion. If your pipe carries only disseminated blebs in this posiion, you're better off moving along strike and seeing if, like a meandering stream, the pipe was carrying massive sulphide when it meandered elsewhere.
The market has a great way of making you scared halfway through the play, when short termers sell out because the first hole was a dud.
Like I keep saying....it's a 1200m long anomaly. Size means nothing, strength means nothing as to the potential grade and tonnage - but what 1200m long means is, you can't drill 1 hole and walk away saying it's tapped out. What is important is that you have tested (with a DHEM survey) 200m of the 1200m strike, and the company has enough money for another 3 or 4 holes. So the mineralised pipe might not be here, specifically, but it could be at the exact opposite end.
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