So- a bit ago we were going back and forth about how deep to drill and what to expect at different depths. I pointed out that the primary porphyry deposit was indicated as being at about 5000 feet deep- my main point being that we might not see the highest grades of ore until we we reached those depths. Being much better versed than I in these matters, VP countered that such deep deposits- although certainly mineable- were less interesting than shallower deposits- for obvious reasons. And in addition- the shallower- skarn/CRD deposits may be of richer concentration anyway. 
So I thought I would consult our  "outside" consultant again to get his expert opinion. 
So- not surprisingly, he largely agreed with VP- that the relatively shallow CRD deposits could very well be very rich- which, personally, I don't mind- since that is very good news for all of us. But he also added that, while there are general rules- they are not always followed and that every location has its own complexities and complications. And how do you sort it out?  You drill.  He said you need the conviction, persistence and determination and confidence to drill until you find what you expect- whether its 2,3,4,or 5000 feet. You keep drilling. 
The good news is that he believes at one of these depths- or several- we will find what we expect.  
And he referenced Bisbee. Enough said.