Tailings: waste rock from which the wanted gold, minerals, opal, etc., has been extracted.
Rubbish, waste matter.
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.
The rock and subsoil that lies above a mineral deposit such as a coal seam.
A sterile stratum that lies above the stratum being investigated
To overload or overtax.