There is an English plumber's saying, "Where there is muck, there's money!"

In mining parlance there is also money in "muck," but the muck is not of the same nature.

The "muck" underground is related by process to the ore blasted from the face of a stope. The next shift, ie, the miner arriving at the face after the blast, employs a mucking machine to "muck" out the ore resulting from the blasting opp. This ore is "mucked" into an ore-pass through a mill-hole, where-in it is caught in a series of chains a level down. It is held in the raise (ore-pass) until a tram operator lifts the chains, loads his cars and proceeds to dump into a skip (simply an ore bucket with high speed capacity to ground level located adjacent to the cage. (man lift) which lifts the muck (ore) to surface.)

Both lifts are housed in the headframe.

Mining 101

RUF

PS: Muck in plumbing terms is a noun, in the mining vernacular, a verb. The end result being the same, money!