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Mike, I suggest you contact Ian Cowburn at L'Argetierre-la-Besse (he's on this mailbase). Bruno Ancel, who is the Community Arcaheologist in L'Argentierre, has specialised in the sedimentology of tailings etc produced by different types of processing equipment. He should be bale to help you further with your enquiry. John Morris -----Original Message----- From: [log in to unmask] [mailto:[log in to unmask]]On Behalf Of [log in to unmask] Sent: 29 July 2000 16:59 To: [log in to unmask] Subject: River pollution from lead dressing I am currently working with a geographer who is modelling the build up of lead in flood plane deposits associated with the River Swale in Yorkshire. I have long runs of production figures, but we have problems with quantifying losses (the bit which interests him). Can anyone on the list point me towards any sources dealing with the losses of lead ore (presumably as slimes) from the dressing process into streams during the period 1780 to 1880? Regards Mike Gill -------------------------------- Mike Gill President and Recorder of the NORTHERN MINE RESEARCH SOCIETY Britain's foremost mining history society at:- http://www.exeter.ac.uk/~RBurt/MinHistNet/NMRS.html -------------------------------- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%