a. A coarse screen made of parallel or crossed bars to prevent passing of oversized material. b. A series of parallel and crossed bars used as platform or walkway floors or as coverings for pits and trenches over which traffic can pass; generally removable to permit access to conveying equipment for servicing. c. A series of parallel and/or crossed bar units fastened to or propelled by a conveying medium, used for carrying large lump-size bulk material or objects. They usually permit passage of air for cooling or for heat to maintain temperature. d. The act of sorting ores by means of grates.
Source: Dictionary of Mining, Mineral, and Related Terms












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