I believe you are under a misperception, that skarn/CRD is likely to be on top of the porphyry, not at the depth of the porphyry.

Well- not exactly. I understand that the CRD is above the porphyry deposit- although it still seems we won't know exactly how deep. But I can now see that it can be well above the porphyry. I believe my misconception has more to do with- and this may not be so either- that- since the porphyry is the source of the welled up mineralization - through which hot water then passes through, dissolving some of those minerals and carrying them up and then forming the CRD deposit- that it seemed logical that the source of the minerals- the porphyry- should still have the highest mineral concentration. It's hard to imagine that the water passing through would so completely leach out  mineral that the porphyry  would be left with little mineral itself. Again- maybe that's so or not- but it's hard to imagine that the porphyry itself wouldn't still retain a significant concentration of mineral  But it sounds like there must be some concentrating process as successive flows of mineral rich hot water pass through the porphyry and up that then leaves a mineral rich CRD deposit that, in fact, can be  richer than the porphyry itself. Hopefully this reflects the concepts that you and our outside consultant are describing- which hopefully I have assimilated. Please let me know if further remediation is required- possibly by PM, since I don't want to bore everyone else who may already understand this. I think that diagram is great and very helpful. And so- thanks. 

In any case- The CRD should be somewhere between the surface and the porphyry- except for confounding factors- such as drift and "folding"- and the bottom line is - we still need to drill until we intersect it.