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At 09:12 16/06/2003 +1000, John wrote: >Why should atmosphere in an abandoned metal mine become especially lethal >?.. I am well acquainted with oxidation in a coal mine producing carbon >dioxie and a gob fires making carbon monoxide ...also methane coming from >coal bearing strata but what does a lead mine exude or produce. ? Radon for one. John John Colby [log in to unmask] Lecturer, School of Computing, Faculty of Computing, Information and English F328a Feeney Building, University of Central England, Franchise Street Perry Barr, Birmingham B42 2SU phone +44 (0)121 331 6937 [log in to unmask] 4 Ambion Rise, Market Bosworth, Nuneaton, Warwickshire, CV13 0NY Phone +44 (0) 1455 290271, mobile 0771 114 1621 website http://www.colbyweb.co.uk