The Design Guide is directed at a wide range of audiences including regulatory agencies in the developed and developing world, small, intermediate and large mining companies, environmental consultants, non government organizations (NGO’s) and the general public. As some of these groups are not highly experienced in the technical issues relating to tailings systems, very broad and general coverage has been included in areas such as the geotechnical aspects, hydraulic design and risk assessment. This information is included in order to illustrate how the detailed geochemical design information can be integrated to yield a complete design package. The logic flow charts described are intended as a guide to those seeking to make a preliminary evaluation of the applicability of the subaqueous disposal system to their particular project. These charts can also be used to identify variables which can be optimized in establishing the basic configuration of the impoundment. After this prescreening, the project proponent may then retain specialized design consultants to assist in the development of the final detailed design. As a further guide, references are provided to documents that contain information on detailed design procedures and standards for such factors as risk assessments and geotechnical and hydraulic designs which are described in general terms in this Guide. Readers are encouraged to consult the references to obtain a more complete understanding of the complexities of impoundment design and construction. Where needed, appropriate consulting expertise should be retained to develop a proper and complete tailings system design.