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

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To: Elizabeth Andrews who wrote (2897)	7/9/1999 11:27:00 AM
From: Bruce Robbins	Read Replies (1) of 4504

Elizabeth, The river is a non-issue in this case. The sulfides are over 150 meters deep. Water and pyrite are an issue in surface mineralization because the pyrite oxidizes over a very long time creating an oxidized cap- in this case, you are talking about sulfides that are more than 150 meters (500 feet) below surface where there is no oxidation. A VMS deposit is mainly a large pyrite lens with some copper-rich (chalcopyrite) and zinc-rich (sphalerite) areas. You are talking about mining something that is a minimum of 15 meters (50 feet) wide- dilution is not going to be a problem here. I would love to discuss things with you, but I do not understand your posts. I have some questions: 1) What is the problem with having pyrite (iron sulfide) in either the orebody, the hanging wall or the footwall? 2) Why does friable pyrite cause problems? 3) What are "other serious and expensive mining problems"? 4) How many (%) underground VMS mines in the world have stopes below the water table? 5) How many (%) VMS mines in the world contain pyrite in the orebody?

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