EVALUATION OF THE USE OF VOLCANIC TUFF AND BIOMASS ASH TO REMEDIATE ACID MINE DRAINAGE FROM ALMASU MARE, ROMANIA, LEWIS, D.W., BOGUSH, A., and CAMPOS, L., (1) Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, United Kingdom, cosmina-ioana.dabu.10@ucl.ac....