| Bruno Creek Tailings Impoundment | |
| Location Map: | Idaho |
| Coordinates: | 44.3203°N -114.5144°W |
| Country: | United States |
| Location: | Custer County, near Challis |
| Status: | O |
| Opening: | 1983 |
| Owner: | Thompson Creek Mining Company |
| Dam Type: | Tailings, center-line |
| Dam Height: | 5500NaN0 |
| Res Capacity Total: | 100000000MT |
The Bruno Creek Tailings Impoundment is a tailings dam on Bruno Creek, 190NaN0 southwest of Challis in Custer County, Idaho. It serves to store tailings for the nearby Thompson Creek Mine. At 5500NaN0 tall, it is the second tallest center-line tailings dam in the world. In 2008, Phase 8 of the mine was approved which includes a raising of the dam to 7500NaN0. The dam is mainly composed of cycloned sand.[1] Currently, the dam stores 100000000MT of tailings and the raise would increase storage to 125000000MT. The downstream slope of the dam will be steepened from 3:1 to 2.75:1.[2] In 1994, it was discovered that acid mine drainage had been forming on the embankment since 1987.[3] Since seepage does occur at the dam, a system of wells was installed to monitor groundwater and a seepage return dam was constructed downstream.[2]