Sluicing


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sluicing

[′slüs·iŋ]
(mining engineering)
Washing auriferous earth through sluices provided with riffles and other gold-saving appliances.
Separation of minerals in a flowing stream of water.
Moving earth, sand, gravel, or other rock or mineral materials by flowing water.

Sluicing

 

a process of primitive mining of alluvial deposits in which they are washed by a free-flowing stream of water released along a trench that cuts through a deposit. Washing through and gradually deepening the trench, the water carries away the lighter, valueless rock. The heavier minerals, which are to be mined, settle to the bottom of the trench and are then extracted by means of a washing drum and pans. Sluicing was the most highly productive means of mining gold-bearing placers at the end of the 18th and the beginning of the 19th century. The perfecting of the method of sluicing of ore in the 1830’s in the Urals laid the basis for the hydraulic process of mining deposits. In the USSR, sluicing has everywhere been replaced by mechanized mining processes, including the use of an excavator, a bulldozer, or a scraper and hydraulic and dredging equipment.

REFERENCE

Shorokhov, S. M. Razrabotka rossypnykh mestorozhdenii i osnovy proektirovaniia. Moscow, 1963.

V. A. BOIARSKII

References in periodicals archive ?
Among the specific questions asked are: (i) Whether there is any statistical evidence for maintaining--as Merchant (2001, 2006) does--or rejecting, as Ginzburg and Sag (2000) and Culicover and Jackendoff (2005) do--syntactic reconstruction, (ii) Whether any patterns emerge from locating English sluicing within an empirical landscape.
Next, I turn to the interaction of Old English sluicing and the level of representation involved in its resolution, all intended to verify how much insight there is in multi-level approaches along the lines of Ginzburg and Sag (2000) and Culicover and Jackendoff (2005).
The picture of sluicing that emerges from my analysis is that it does not allow much recalcitrance in its licensing: syntactic identity is mostly preserved; where it is not, the departure is due to sprouting alone.
A possible scenario largely ignored in the literature is that the recalcitrance of modern sluicing may not have been as pronounced in the past.
Clearly, OE already witnesses integration of the syntactic side of sluicing with a non-syntactic one inasmuch as syntactic reconstruction is not a viable option in passages like (16)-(18), though it could be posited for (15) and (19)-(20).
Water-quality parameters below the hydro during sluicing have been monitored since spring 1989.
For purposes of this study, only downstream of the hydro was evaluated for purposes of eliciting any possible barrier/distribution effects or perturbating impacts as a result of sluicing events during this nine-year period.
It appears that species richness remins relatively stable regardless of any hydro activities related to sluicing, at least in the short term.
It appears that with environmentally friendly ways to pass sediment, fish below Spencer Dam survive and express resilience to conditions created by sluicing.
This lower reach of the Niobrara River appears to have fishery populations that have adapted to the annual perturbations caused by sluicing or short-term sediment releases.