Mining. Ore with a portion of the matrix adhering to it, forming the second portion or stratum of a mass of ore in the process of washing.
1876. Mid-Yorksh. Gloss. (E. D. S.), Chat, ore and stone together, Nidd.
1881. Raymond, Mining Gloss., Chats, Northumb., Small pieces of stone with ore.
b. Comb. chat-mill, -roller, a special mill or roller through which the ‘chats’ have to go, the product being known as chat-ore or ‘seconds.’
