mullock

1. (UK, dialectal, uncountable, usually)Rubbish, waste matter.

2. Mining waste or ore processing waste:

   (Australia, New Zealand, uncountable, usually)Overburden: waste material generated while searching for minerals or while mining, such as when sinking a shaft.

3. (Australia, New Zealand, uncountable, usually)Tailings: waste rock from which the wanted gold, minerals, opal, etc., has been extracted.

4. (uncountable, usually)Nonsense, rubbish.

5. (UK, Yorkshire, dialectal, uncountable, usually)A mess; the result of a blunder.

uncountable