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1. a channel that carries a rapid current of water, esp one that has a sluicegate to control the flow
2. the body of water controlled by a sluicegate
3. See sluicegate
4. an artificial channel through which logs can be floated
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in ore dressing, an inclined, rectangular trough, usually with a rough bottom of napped fabric covered with a pattern of wood planks, corrugated rubber, or the like, designed for gravity concentration of minerals. As the pulp passes through the sluice, the particles separate into layers according to their density and grain size; the heavier minerals settle to the bottom and are held by the friction created by the roughness and the bottom pattern. The vortices that form promote selective concentration. After the material has accumulated, the sluice is rinsed out by washing the concentrate into a separate receptacle with a powerful stream of water.

A distinction is made between fixed and band-type sluices. Fixed hydraulic sluices are designed to process large amounts of material. They are made of from six to eight consecutively laid boards several meters long with a slope of 0.03–0.06. They can extract 70–80 percent of the tin from ore concentrates containing 15–30 percent SnO2; the extraction of gold is 40–60 percent. Other sluicing devices, cradles, and trommels are used for processing crude concentrates.

Band-type sluices consist of a continuous rubberized band, the upper part of which moves against the stream of pulp. The lighter fraction is unloaded in the lower section, and the heavier fraction is washed from the upper section of the band by a sprinkler. A band-type sluice 3 m long and 1.5 m wide has a productivity of 5 cu m/hr and can extract 92–95 percent of the gold in an ore.

Automatic multideck movable sluices have been in use since the 1970’s. The type used in the USSR has five decks arranged in parallel above one another in tiers. The feed is stopped automatically every 4 min, the decks are tipped to an angle of 45°, and a petcock is opened for 1 min for rinsing. The use of vibration in sluices increases productivity.


Spravochnikpo obogashcheniiu rud, vol. 2, part 1. Moscow, 1974.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


(civil engineering)
A passage fitted with a vertical sliding gate or valve to regulate the flow of water in a channel or lock.
A body of water retained by a floodgate.
A channel serving to drain surplus water.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
POUR LOSER Lee Goddard admitted opening sluice gate
"Once we have these sluice gates fixed, it will allow us to de-silt the millpond.
Furious residents living upstream of the Khlong Sam Wa canal earlier tried to forcibly raise the sluice gate and demanded that the authorities ease flooding in their communities by channeling more water through the canal.
Asked who controlled the sluice, Rajapakse said that ''We are around it,'' while the LTTE said government troops were ''close to the sluice gates.''
Although the building of the dam is seen as an important step in the regeneration of Mozambique, the rangers believe that the addition of the sluice gates represents a huge threat.
Jordan, of Callander, had denied culpably and recklessly endangering life by opening the three sluice gates on July 12 last year.
'They have been told the sluice gates at Bala are there to help and assist the situation down on the Dee.'
If they blew the dam's sluice gates, the released waters would flood the valley and stop further UN advances.
''I heard that after the opening of sluice gates the sea environment improved in a similar reclamation site in South Korea.
Environment officers put oxygen into the river and sluice gates were opened to disperse the cream into the sea.
William of Orange saved the Dutch by opening the sluice gates and flooding the land in 1673.
Summary: Kathmandu [Nepal], July 14 (ANI): Nepal on Sunday opened all 56 sluice gates of Kosi barrage as the water level rose to an alarming situation following incessant rain across the Himalayan nation.