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  2. Drywasher - Wikipedia

    en.wikipedia.org/wiki/Drywasher

    A drywasher is like a highbanker, [clarification needed] since it uses a motor and a form of sluice, but it has no need for water. It drywasher operates by the use of air. [ 1 ] By forcing air to flow up through the material as it moves down the sluice, the heavier materials, like gold , will stay at the bottom and get trapped by the riffles ...

  3. Sluice - Wikipedia

    en.wikipedia.org/wiki/Sluice

    A sluice gate. A sluice (/ s l u s / SLOOS) is a water channel containing a sluice gate, a type of lock to manage the water flow and water level. It can also be an open channel which processes material, such as a river sluice used in gold prospecting or fossicking. A mill race, leet, flume, penstock or lade is a sluice channeling water toward a ...

  4. Rocker box - Wikipedia

    en.wikipedia.org/wiki/Rocker_box

    Today, the rocker box is not used as extensively as the sluice, but still is an effective method of recovering gold in areas where there is not enough available water to operate a sluice effectively. Like a sluice box, the rocker box has riffles and a carpet in it to trap gold. It was designed to be used in areas with less water than a sluice box.

  5. Placer mining - Wikipedia

    en.wikipedia.org/wiki/Placer_mining

    A long sluice box runs along the mine. [16] The sluice box was used extensively during the California gold rush for larger scale operations. When streams became increasingly depleted, the grizzly and undercurrent variants of the sluice box were developed. The grizzly is a set of parallel bars placed at a 45-degree angle over the main sluice box ...

  6. Hydraulic mining - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_mining

    A man leans over a wooden sluice. Rocks line the outside of the wood boards that create the sluice. While generating millions of dollars in tax revenues for the state and supporting a large population of miners in the mountains, hydraulic mining had a devastating effect on riparian natural environment and agricultural systems in California.

  7. Gate valve - Wikipedia

    en.wikipedia.org/wiki/Gate_valve

    A gate valve, also known as a sluice valve, is a valve that opens by lifting a barrier (gate) out of the path of the fluid. Gate valves require very little space along the pipe axis and hardly restrict the flow of fluid when the gate is fully opened.

  8. Gatehouse (waterworks) - Wikipedia

    en.wikipedia.org/wiki/Gatehouse_(waterworks)

    A gatehouse, gate house, outlet works or valve house for a dam is a structure housing sluice gates, valves, or pumps (in which case it is more accurately called a pumping station). Many gatehouses are strictly utilitarian, but especially in the nineteenth century, some were very elaborate.

  9. Stoplogs - Wikipedia

    en.wikipedia.org/wiki/Stoplogs

    Small stoplogs. Stoplogs are hydraulic engineering control elements that are used in floodgates to adjust the water level or discharge in a river, canal, or reservoir.Stoplogs are designed to cut off or stop flow through a conduit.

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