An array of techniques have been developed during the last several decades to abate or control pollution by acid mine drainage from coal and metal mines. Although most of these techniques are successful in eliminating or decreasing the deleterious effects of AMD in some situations, they are unsuccessful in others. Due to the inherent variability between mines, no one abatement or treatment technique is effective on all sites, and selection of the best method on each site is difficult given the array of methods available. The techniques also vary in the type and size of problem they are capable of handling. Their individual costs, effectiveness, and maintenance are also important considerations. Therefore, accurate information is needed to understand the limitations of the various methods and their response to various site variables. Continued research is imperative for field testing of existing technologies, as well as continued development of new technologies. At present, there is no authoritative guide or manual to assist in evaluating the best technique for a given situation. In order to continue to mine coal and other minerals without harming the environment, the best science and techniques must be identified and implemented in order to minimize the production of acid mine drainage. To accomplish this goal, the Acid Mine Drainage Technology Initiative (ADTI) was organized to promote communication among scientists and engineers dealing with acid mine drainage, and to develop a consensus on the identification and optimum useage of each method. The intent is to provide information on selection of appropriate techniques for specific problems that will ultimately lead to a higher level of success in avoidance of AMD and remediation of existing sources, at a savings in cost and staff time, and with greater assurance that a planned technique will accomplish its objective. This effort will result in enhancement of mine drainage quality, improvement in stream cleanup and its cost effectiveness, and with widespread demonstrations will become in itself a technology transfer mechanism. ADTI is a coalition of State and Federal agencies, industry and private organizations, academia, and consulting firms. It is a technology-based initiative, not regulatory or political. ADTI is divided into two groups: prediction and avoidance/remediation. About 30 individuals constitute Group 2 (as listed in the acknowledgments), which focused on avoidance and remediation techniques. The group decided at its initial meeting on April 8-9, 1996 to produce a technology handbook that would describe the many techniques and a set of case studies from which conclusions could be drawn on the applicability and limitations of each technique. The handbook will address all types of mine drainage control and treatment methods, including generalized design and performance criteria, as well as historical case studies. Ultimately, the handbook should enable the user to select the best, technologically proven, most economical method suited to a particular situation. The handbook should provide design details associated with failure to avoid repeating inadequate and inappropriate methods. It should also aid in determining research needs and cost effectiveness for various options. This Phase I document summarizes the technologies and provides some relevant case studies collected by the various members. Further development of technologies, their description, and increased numbers of case studies will be included in a future document. The work to date has been largely volunteer in nature; support for time and travel has been met by individuals or their organizations without a specific budget for the ADTI work. Although considerable progress has been made, as indicated by this Phase I document, the lack of funding has limited progress, and the results must be considered preliminary. The initial focus has been on acid mine drainage from coal mining, mainly in the eastern U.S., because of the easier logistics in assembling a large group of experts in meetings, and because of the additional complications created by metal mine pollution. Although much of the discussion in this manual also applies to metal mine drainage, future work will contain more emphasis on drainage from metal mines. The handbook will be updated periodically to add new infornation from case studies and research, and as improved insights are gained on the optimum applicability of the various techniques.