This report summarises the findings of the Energy Technologies Institute’s project studying the capture and storage of carbon dioxide using mineralisation, CCSM. Five major groups of CCSM technologies were defined and the so-called “aqueous multi-step with additives” group was selected for investigation. Ammonium compounds were utilized as additives, and the CCSM process studied in this project is referred as an “Ammonium-based” CCSM.The ETI is grateful for the contributions made by all participants of the Mineralisation project; Perkins Engines Company Limited (Caterpillar), Shell Global Solutions International B.V., Natural Environment Research Council as represented by the British Geological Survey, and the University of Nottingham.