The waste material left over after the valuable fraction has been extracted from mined ore

From tail, the remaining part, plus the suffix -ings

Mine waste Residue
Concentrate Ore
"Refining carries environmental burdens, tailings, effluent and, in the case of rare earths processed from monazite, radioactive thorium and uranium residues, which make siting a multi-year political contest."

Precise technical vocabulary for GS3 answers on mining and mineral-processing environmental impact, e.g. 'unmanaged tailings ponds are a recurring source of downstream water contamination near refining and beneficiation sites.'

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