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Message: evg conversation from anohter board

evg conversation from anohter board

posted on Jan 15, 2010 11:21AM

Well, we got 'em and over all quite good: The high grade continues to depth, the porphyry intersection was nicely gold bearing, and there is a typical stockwork zone surrounding the porphyry. We also got increased halo gold and further indication that the porphyry system as an important element of the deposit. It appears the contact zone between the diatreme and schist provided a location of fluid egress and deposition driven by and from the porphyry system. Now some questions are; how big is the porphyry system and what other zones similar to the northstock contact zone exist.

As discussed some time ago now, the antelope basin intrusive diorite provided conditions similar the the northstock, but on a smaller scale. Dike swarms commonly branch off of the main body of the underlying pluton or stock. EVG has found one branch (swarm) and a passer-by or more deeply connected dike in the diorite, which served as conduits. Though dike swarms can take various forms, lets see if this becomes a pair of moose antlers and what other gold bearing structural feature EVG can find. There could even be more distal gold deposits related to meteoric hydothermal system drive by by the same porphyry.

As noted in the paragraph from the treatese found on the NBMG webstie, (parphrasing here) the pps of legit companies who have and develop deposits will taked care of itself over time. We'll likely get a beginning true worth of EVG when a resource is defined.

(Those holes in the no-man's-land between the northstock and the antelope basin didn't report yet.)

Congrats EVG for adding another brick.

Well, depending upon your expectations anything could suck. If you'll look at the holes drilled between the north stock and the antelope basin they reported stockwork veining mineralization, thought of as related to the porphyry. While you may have hoped for a solid mass of minable gold mineralization between those two areas, that's not how mineralization is normally distributed. It finds the paths of least resistance. And, contrary to what might be your impression and expectations for these drill results, it looks like the two are connected as down on the same duck. It isn't called halo mineralization just as single simple conceptual metaphor.

These are hydrothermal systems requiring mineralized fluids and heat. So, add to the metaphor the thought that of the parent pluton is a sun-like heat source driving currents of heated and pressurized fluids out hemispherically toward areas of lower pressure, up and way. Within that hemisphere are rock conditions that are more conductive to the passage of fliuds and may also have better chemical/physical properties condusive to mineral deposition than others. In general, those areas of high fluid flow are also areas of lower pressure reducing the temperature of those fliuds, their ph, and the ionic state of their transporting ligands promoting deposition.

EVG is working their way toward the heat source while also defining what they have. They will likely have multiple paths in their approach as this is an outside-to-in deal and the best guides are mineralization. One more thing we can hope for is that the body of or the rock surrounding the pluton is gold mineralized highly enough to add to the desposit. That could be huge.

One last bit: Plutons cool slowly insulated by the rock mass around them. They also cool from the top down with some of the last episodes of crystalization ( it drives out mineral ized fliuds) from the top down so that the pressure and heat decends and the thus mineralizing fliuds and dynamics of the system also decend lowering the areas of deposition as well. The pluton may be many thousands of feet below the known depths deposit and thus it is reasonable to to envison the deposit can go much deeper. That is a big difference between an epithermal gold system and a porphyry one and why finding the porphyry such a positive discovery.

Best of luck for all.

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