Tailings Impoundment Database

An Impoundment is defined as any dam, or other engineered structure, intended to confine a body of water (fresh, alkaline, or acidic), mine tailings or refining residue, or any other solid or liquid waste material.

Alcoa's size limit criteria for impoundment public disclosures are:

  • Greater than 3 hectares (ha) in area, or
  • Height (dike, max liquid, cap, etc.) at least ~2 meters above low point of surrounding grade,
  • In-ground impoundments (mine pit, pond, etc.) and solid waste landfills not included.

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