MEND (Mine Environment Neutral Drainage). 2009. Prediction Manual for Drainage Chemistry from Sulphidic Geologic Material. Report 1.20.1.Acid Rock Drainage / Metal Leaching Prediction and Mitigation Prediction Manual (MEND, 2009) provides guidelines for approaches, methods and procedures Lawrence, R. W. and Wang, Y. Published by Canmet, Ottawa, ON, Canada. MEND. 2009. MEND report 1.20.1: Prediction manual for drainage chemistry from Price, W.A. 2009. Prediction Manual for Drainage Chemistry from Sulphidic Geologic. Materials. MEND Report 1.20.1. December. Available:. Prediction Manual for Drainage Chemistry from Sulphidic Geologic Materials (December 2009) has been relocated to the MEND website. and processes. The Prediction Manual for Drainage Chemistry from Sulphidic Geologic Materials (MEND. 1.20.1, 2009) provides a comprehensive document for use This Manual recommends site specific prediction of drainage chemistry. Users of the Manual should consider local site conditions, such as the weathering Guidance is provided on the strengths and potential limitations of different procedures, analyses, tests and criteria used to predict future drainage chemistry.