trommel

A revolving cylindrical sieve used for screening or sizing rock and ore.

In mining, a revolving cylindrical sieve for cleaning or sizing ore. Also called sizing-trommel and washing-drum or washing-trommel, according as it is used for sizing or for cleaning ores. See sizing, 3.

A revolving buddle or sieve for separating, or sizing, ores.

A revolving buddle or sieve for separating, or sizing, ores.