Rubbish, waste matter.
Tailings: waste rock from which the wanted gold, minerals, opal, etc., has been extracted.
Nonsense, rubbish.
A mess; the result of a blunder.
Overburden: waste material generated while searching for minerals or while mining, such as when sinking a shaft.
To clear waste material out of a mine.
A foreign substance that makes something dirty, or impure, especially waste from human activities.