Definition - What does Muck mean?
Muck is the material removed from the earth during trenchless boring or drilling. It's the material pulled from a bore by an auger or flushed from a bore by drilling fluid (mud) that flows from a horizontal drilling string. Depending on the terms of the trenchless construction contract, muck may either be hauled away from the site or used on-site.
Also known as spoils or cuttings.
Trenchlesspedia explains Muck
Muck can consist of rock, soil, mud, dirt or any combination of materials that's harvested from a bore. Often seen as having little or no value, it's nature and composition may provide clues as to the conditions in the substrate through which a bore progresses. It can also reveal issues with a bit or bottom hole assembly. Muck, in some instances, may even provide clues about the history of the area in which the bore is located.