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Tuesday, January 27, 2015 2:34:57 PM
Since you're following the anonyms of the other board, here is a worthwhile explanation to your questions made by Dr. DeCosta. I've never met Dr. DeCosta, but I'm confident in his geological knowledge of ADL because he's been there, understands the geology of the area, has discussed the property at length with Gordon House P.Geo (dec.), JJ Quijano and a variety of geologists who have explored the mountain - some of whom his group hired independently to assess the viability of the deposit.
"You're describing the "Lobo breccia" or "Smithson breccia" since Terrence did most of the work on it. The impressive breccia is the "Cu/Mo breccia" SE of the Gordon breccia. Its surface footprint covers 700 meters vertically and it wraps around the eastern aspect of the mountain. The Gordon breccia is probably the wimpiest of them all but it's easy to work on being located centrally on the plateau.
The reason "breccias" are so important is that they indicate "upward flow" of magma and hydrothermal fluids. Typically you've got these gigantic "magma chambers". The base is full of molten magma and the top is full of gases and hydrothermal fluids. Once a certain pressure build up point is reached the roof of the magma chamber blows up and the fluids and gases go laterally and upwards to areas of lesser pressure (not downwards because those are even higher pressures).
The explosivity is so immense that the solid rock that used to be the roof of the magma chamber actually gets blown into little angular bits that end up getting surrounded by the hydrothermal fluids and it cools into a "breccia". A "breccia" is not only an entity it is a texture consisting of angular relatively large rock crystals surrounded by a much finer groundmass like Rice Krispie squares.
So a "breccia" at surface signifies historical "upwards flow" post explosive activity. The good thing about "upward flow" is that as the magma and the fluids flow upwards they shed the feldspars and quartz that represent waste rock or "gangue". This makes the concentration of the desirable metals that much higher and that much more economic. The natural concentration of these desirable metals in the earth's crust is way too low to be economic so you need this natural "concentrating" mechanism to make mining economic. A breccia at surface therefore suggests explosivity, followed by upward flow hopefully involving enough concentration of the desirable metals to be economic. So "breccias" are a very good thing. The underlying "porphyry" that gave rise to the "breccia" represents the historical magma chamber that gave birth to the "breccia".
"Porphyry" also represents both a texture and a geological entity. In a "porphyry" you still have larger crystals surrounded by a fine groundmass but the larger crystals are more rounded instead of angular i.e. "plum pudding" as opposed to "Rice Krispie squares" for a breccia. The porphyritic rock didn't get the crap kicked out of it as much as the brecciated rock did.
As far as how they're attacking the mountain, you noticed how once AMC was granted a legal pathway to CONTROL the entire mountain by annexing the LDM, Mambo, Columbo and now apparently the Fortuna concessions David Bent called a 20 day "timeout" on drilling at the ADL in order to take an "X-ray" (Hi intensity aeromag survey) of 20,000 ha even though the properties AMC has a pathway to CONTROL total about 7,000 ha. They're now looking through the zoom lens at the entire mountain and making a decision how to properly address the entire project instead of just the ADL. Remember he had already surveyed and constructed a bunch of additional drill pads at the ADL that haven't been used yet but probably soon will.
With the addition of the LDM/Mambo he's got to be feeling like a kid in a candy store. Although we shareholders don't know, he knows why the "cone of silence" dropped so abruptly over at the LDM/Mambo after some "game changing" event took place. I would assume it has something to do with the "porphyritic material" they hit at the 1,350 meter elevation level containing chalcocite, bornite, malachite and chalcopyrite. These represent 3 high octane types of copper plus boring old chalcopyrite. We shareholders are rooting for a nice thick "Supergene Enrichment Zone" which some porphyries have and some don't. The presence of "chalcocite" is suggestive of an SGE zone being present."
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