F1 Four Corners Mine

About F1 Four Corners Mine

The primary purpose of F1 Four Corners Mine 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 Myakka River near Duette.

The dam stands 58 feet tall and stretches 14,160 feet across, creates a reservoir covering 322 acres, has a maximum storage capacity of 17,500 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1989, the structure is 37 years old.

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. An emergency action plan is in place for this dam. The most recent inspection on record was 01/23/2006. That was over 20 years ago.

At 58 feet, this dam is taller than 95% of all dams in the United States.

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