The Collaborative International Dictionary of English v.0.48:
Muck \Muck\, n. [Icel. myki; akin to D. m["o]g. Cf. Midden.]
1. Dung in a moist state; manure. --Bacon.
2. Vegetable mold mixed with earth, as found in low, damp
places and swamps.
3. Anything filthy or vile. --Spenser.
4. Money; -- in contempt.
The fatal muck we quarreled for. --Beau. & Fl.
5. (Mining) The unwanted material, especially rock or soil,
that must be excavated in order to reach the valuable ore;
also, the unwanted material after being excavated or
crushed by blasting, or after being removed to a waste
pile. In the latter sense, also called a muck pile.
Muck bar, bar iron which has been through the rolls only
Muck iron, crude puddled iron ready for the squeezer or
muck pile see muck pile in the vocabulary.
[1913 Webster +RDH]