This study provides an evaluation of the effectiveness of mine tailings ponds as a means of minimizing or reducing the flow of acids, dissolved solids, tailings, and heavy metal ions into the surrounding environment. It also suggests several types of treatments or methods that would reduce the discharge of undesirable materials from the tailings ponds. Samples of tailings pond inflows, outflows, seepages, and stream water above and below the tailings ponds were collected from seven major operating mines in the Coeur d'Alene District. They were analyzed for 13 elements, along with chlorides, fluorides, electrical conductivity, ph, and temperature. Mineral extraction involved a process of selective flotation to concentrate the ore. Tailings ponds for mines 1, 4, 5, 6, and 7 were found to be effective in reducing suspended solids to acceptable limits. The outflows of these ponds did not contain toxic elements above acceptable limits. Tailings ponds for mines 2 and 3 were not effective in reducing concentration of cadmium, iron, manganese, lead, zinc, and fluoride.