I haven't worked in AMD environments in a while, so I don't have any current pyrite oxidation examples. The manual does have a Fe+2 oxidation example and there is a rate expression for pyrite oxidation in phreeqc.dat. Sorry I'm not much help here. You may want to contact Tony Appelo (appt@xxxxxxxxx), who may have something more current. David David Parkhurst (dlpark@xxxxxxxx) U.S. Geological Survey Box 25046, MS 413 Denver Federal Center Denver, CO 80225 "Milo Simonic" <milo.simonic@xx To: "D L Parkhurst" <dlpark@xxxxxxxx> on.co.za> cc: In-Reply-To: <NEBBKPPHODCGHICIOHNLCEGKCAAA.milo.simonic@xxxxxxxxxx> Subject: Pyrite oxidation 01/08/01 06:28 AM Dear Dr Parkhurst, PHREEQC2 offers exciting opportunity to conduct kinetic modelling. Working with tailings on gold mines and discard dumps on coal mines one of the problems encountered is pyrite oxidation. I'd like to gather some example files which deal with kinetic pyrite oxidation (in PHREEQC2) in two principal scenarios: - pyrite oxidation under unsaturated conditions with oxygen flow/diffusion (e.g. in discard heaps) - pyrite oxidation under flooding conditions of previoulsy mined space (i.e. what happens when a mine ceases its operation and is flooded) Would you happen to have some albeit fragmentary examples that I could develop into real-life simulations? Your advice or suggestions will be highly appreciated. Kind regards, Milo Simonic Hydromedia Solutions (Pty) Ltd Pretoria, South Africa
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