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Author: Admin | 2025-04-28
Boxes were effective in locations with little water supply and were also used extensively during the early years of the “gold rush” era in Western America. The material was fed into the hopper of the box, and the box was vigorously shaken back and forth while water flowed over the material.The rocker boxes contain three parts, namely screen, riffles, and apron. The material is screened with water poured over it. The screen holds the larger particles, where the clay can be broken down until all the tiny gold particles are finally removed. The riffles, which are placed at the lower part of the box, are used to trap the gold particles, while the finer particles are washed with water on a collection “apron” of wood or cloth with a certain inclination. The apron is used to retain the largest possible quantity of gold and is made of canvas stretched over the frame of the apparatus [10]. 3.3. The Sluice BoxesThe sluice boxes (Figure 1) are inclined devices similar in shape to a “trough” and have a suitable mechanism for trapping gold (or other heavy mineral particles) in their flat lower part. Sluices work on the principle that heavy particles tend to sink to the bottom of a stream of flowing water while lighter particles tend to be carried downstream and discharged off the end of the sluice. In sluices where turbulent flow does not develop, the difference in settling rate between the light and heavier particles leads to the separation of the slurry into stratified zones. As a result, the slurry stream flows along the sluice box with the higher density and larger-sized particles accumulating in a zone near its lower part, where they can be trapped within the apron and removed from the stream. Conversely, lighter particles tend to
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