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Gold/Mining/Energy : Manhattan Minerals (MAN.T)

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To: Elizabeth Andrews who wrote (2896)	7/7/1999 3:09:00 AM
From: Jeff Dickson	Read Replies (1) 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.

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