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Gold/Mining/Energy : Manhattan Minerals (MAN.T) -- Ignore unavailable to you. Want to Upgrade?

To: Elizabeth Andrews who wrote (2896)	7/7/1999 3:09:00 AM
From: Jeff Dickson	Read Replies (1) \| Respond to of 4504

Why are you predicting higher grades in the thicker parts of the deposit? What geological precedent is there for this? From: bushnet.qld.edu.au Mineral and Metal Zoning The distribution of metals and sulphide types is commonly zoned on the scale of an individual lens and in clusters of lenses. Cu is usually high relative to Zn + Pb in the core of the pipe and in the spine of the massive sulphides.The ratio of Zn + Pb to Cu increases around the outside of the pipe and towards the upper part and margins of the massive zone. Au and Ag usually are highest in the fringe areas. Barite also tends to occur at fringes. Proportions of Zn, Pb and Ba also tend to increase in lenses peripheral to the center of the deposit, both laterally and vertically (up-strastigraphy). Pyrrhotite + magnetite may occur in the core zone with pyrite usually becoming dominant at the fringes. Also there: VMS deposits tend to occur in districts. Up to two dozen deposits, might be clustered in an area of a few tens, of square kilometres. Known VMS districts are good hunting grounds for new discoveries.

To: Elizabeth Andrews who wrote (2896)	7/7/1999 11:30:00 AM
From: Claude Cormier	Respond to of 4504

<<Why is the grade lower distal to the vent? Why are you predicting higher grades in the thicker parts of the deposit? >> Because the center of the sulphides body is thicker and deeper. First, since there are more sulphides in the center, the odds of finding higher grades are improved. This is not no say that the average of the large intervals will be higher. Second since it is deeper, the odds of finding higher copper grades are also increased. It is a well-known pattern as documented by Sangster (1972) that higher copper grades are found in lower zones?