1854 4 Feb. 165/4 Ore crushing machine.
1882 (U.S. Bureau of Mint) 597 There have been in California many inventions in ore crushing.
1937 July 194/1 Near the mines were primitive ore-crushing plants in the form of stone slabs and hammers.
2002 (Nexis) Nov. 11 More than 250 seemingly criss-crossing conveyor belts that carry material from ore crushing through diamond recovery.