Mosaic Csa F4b

About Mosaic Csa F4b

The primary purpose of Mosaic Csa F4b is tailings. Tailings dams contain waste material from mining operations — typically a slurry of finely ground rock left over after valuable minerals have been extracted. These structures require ongoing monitoring because tailings can contain heavy metals and other contaminants. The dam is owned by The Mosaic Company (private). It impounds the Long Branch near Fort Lonesome.

The dam stands 62 feet tall and stretches 12,000 feet across, creates a reservoir covering 465 acres, has a maximum storage capacity of 26,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2004, the structure is relatively new.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 07/20/2005. That was over 20 years ago.

At 62 feet, this dam is taller than 95% of all dams in the United States.

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