What are mill tailings?

What are mill tailings?

• A. Discarded materials from ore treatment processes.
• B. A quarrying technique.
• C. A natural rock formation.
• D. A type of mining tool.

Answer: (A)

Mill tailings are the waste material left after ore has been milled and the valuable minerals have been separated. After crushing and grinding the ore, the processing steps (like flotation or other separation methods) produce a slurry or pile of fine particles that still contain non-valuable rock and any residual processing chemicals. These residues are discarded and stored because they no longer hold usable metal values. They can raise environmental concerns if not managed properly due to potential metal content and sulfides that can cause issues like acid mine drainage. This isn’t a quarrying technique, a natural rock formation, or a mining tool—the tailings are the byproduct of ore treatment.