Shoad

n.1.(Mining) A train of vein material mixed with rubbish; fragments of ore which have become separated by the action of water or the weather, and serve to direct in the discovery of mines.
References in periodicals archive ?
"During the practice sessions we looked unbeatable catching small bream but on the two match days huge shoads of catfish moved in and the continental catfish experts cashed-in" said senior coach Mark Downes.