In hydraulic mining, gratings used to catch and throw out large stones from the sluices.
A grating, usually constructed of steel rails, placed over the top of a chute or ore pass for the purpose of stopping large pieces of rock or ore that may hang up in the pass.
A screen made from railroad rails, pipes, or heavy-duty screenwith holes. Dirt and rocks that are dug up in mining operations are dumped onto the screen where the smaller materials pass through. See Cat Mining.
(2) a device used for coarse screening of bulk materials. A rugged screen for rough sizing at a comparatively large size (for example, 6 inches); it can comprise fixed or moving bars, disks or shaped tumblers or rollers.
A device used to keep rocks and boulders out of a sluice box.
A coarse screen used to remove oversize pieces from earth or blasted rock. A gate or closure on a chute.
a coarse screen or series of parallel rods or bars used for rough sizing of gravel.
A metal grate that screens the large rocks out of a sluice box.