What are Mullucks?

Mullucks, also known as "mullocks" or "mullock," are a term used primarily in Australia and New Zealand to refer to spoil or waste material, particularly from mining operations. This can include the debris and leftover rock that is removed during the extraction of valuable minerals. The term may also be applied more generally to describe any kind of rubble or refuse. In some contexts, it can refer to a specific type of clay or sediment.