mullock

"We'd better get down and clear out some of the mullock," he said.

And diggers came up with their flannels and moleskins yellow and heavy, and dripping with wet 'mullock'.

Well, aw'll mak a mullock o' thee i' two minnits if tha doesn't shut up!

Aw've had nowt to do wi' th' orderation o' this mullock, an' if ther's owt lost aw'll pay for it.

There was nothing the matter with Rum-Enough but a dislike of shifting mullock if he could get anyone to shift it for him.