tailings

Short definition from Wiktionary

Noun

1. 1
   plural of tailing
2. 2
   The waste that remains after the minerals have been extracted from an ore by ore dressing; the waste from coal mining.
3. 3
   The weak feints, the last fraction of product obtained at the end of distillation, typically impure and containing fusel oils.
4. 4
   Inferior or damaged grain, as well as seeds of other plants (weeds), removed from grain before milling or sowing.