The contents of the final reports (2 volumes) include: the identification of process steps using water and/or generating wastewater, the amounts of water used for various purposes, recirculation rates, amounts of wastewaters, specific or characteristic substances in wastewaters, the prevalence of wastewater treatment practice, methods, and costs; current treatment problems, and plans for future practices of recirculation or wastewater treatment. The metals reported on included copper, lead, zinc, and associated byproducts (arsenic, cadmium, silver, gold, selenium, tellurium, sulfuric acid, salts and compounds), mercury, (primary) gold and silver, aluminum, molybdenum, and tungsten. The information includes detailed processing descriptions and flowsheets, tabulations of quantities of water intake, quantities used by category, recirculated water, discharge water quantities and analyses, water treatment costs. (Modified author abstract)