
1) Metallurgical process
Found on
https://www.crosswordclues.com/clue/tailings

1) Slag
Found on
https://www.crosswordclues.com/clue/tailings

Tailings, also called mine dumps, culm dumps, slimes, tails, refuse, leach residue or slickens, are the materials left over after the process of separating the valuable fraction from the uneconomic fraction (gangue) of an ore. Tailings are distinct from overburden, which is the waste rock or materials overlying an ore or mineral body that are disp...
Found on
http://en.wikipedia.org/wiki/Tailings

(from the article `mineral processing`) ...Such a suspension can simulate a fluid with a higher density than water. When ground ores are fed into the suspension, the gangue particles, ...
Found on
http://www.britannica.com/eb/a-z/t/5

Ground rock remaining after particular ore minerals (e.g. uranium oxides) are extracted
Found on
http://www.encyclo.co.uk/local/20725

Ground rock remaining after particular ore minerals (e.g., uranium oxides) are extracted.
Found on
http://www.encyclo.co.uk/local/20841

Ground rock remaining after particular ore minerals (e.g., uranium oxides) are extracted.
Found on
http://www.encyclo.co.uk/local/21076

waste rock from mining operations that contains concentrations of mineral ore that are too low to make typical extraction methods economical.
Found on
http://www.encyclo.co.uk/local/21808

Ground rock remaining after particular ore minerals (e.g. uranium oxides) are extracted.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

Rock and other waste materials removed as impurities when minerals are mined and mineral deposits are processed. These materials are usually dumped on the ground or into ponds.
Found on
http://www.encyclo.co.uk/visitor-contributions.php

Gravel, dirt, and rocks that is left behind after extracting the minerals.
Found on
http://www.legendsofamerica.com/

The slurried waste from a concentrator. See also flotation.
Found on
http://www.metalbulletin.com/Glossary.html

Material rejected from a mill after the valuable minerals have been recovered. Changes in metal prices and improvements in technology can sometimes make the tailings economical to reprocess at a later date.
Found on
http://www.southernperu.com/ENG/intope/Pages/PGGlossary.aspx

The material that remains after all economically and technically recoverable precious metals have been removed from the ore during processing.
Found on
https://copperfoxmetals.com/investors/glossary-of-terms/

The end-product or waste of ore mining, usually piled up in close proximity of a mining area. Some will often contain some metal that can be extracted.
Found on
https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/

The residue of a material that will not pass through a sieve. It may be further processed and then re-sieved.
Found on
https://walkerceramics.com.au/resources/glossary-of-ceramic-terms/

Residue of raw material or waste separated out during the processing of crops or mineral ores.
Found on
https://www.encyclo.co.uk/local/20094

refuse material resulting from the washing, concentration, or treatment of ore.
Found on
https://www.encyclo.co.uk/local/22701

Crushed or finely ground waste rock from which valuable minerals or metals have been extracted.
Found on
https://www.encyclo.co.uk/local/22732

Crushed or finely ground waste rock from which valuable minerals or metals have been extracted.
Found on
https://www.encyclo.co.uk/local/22733

Material rejected from a mill after most of the recoverable valuable minerals have been extracted.
Found on
https://www.encyclo.co.uk/local/22733

Material rejected from a mill after most of the recoverable valuable minerals have been extracted.
Found on
https://www.encyclo.co.uk/local/22734

Finely ground particles of ore deposited as waste after processing by a mill or smelter.
Found on
https://www.encyclo.co.uk/local/22736

The end-product or waste of ore mining, usually piled up in close proximity of a mining area. Some will often contain some metal that can be extracted.
Found on
https://www.reade.com/reade-resources/reference-educational/reade-reference

Ground rock remaining after particular ore minerals (e.g. uranium oxides) are extracted.
Found on
https://www.world-nuclear.org/nuclear-basics/glossary.aspx
No exact match found.