e of one side . Since a large amount of water is necessarily let into the box , in order to prevent it from sweeping away any particles of gold which have fallen into the sluice , the sluice is divided off by ten , or if it is as long again , by fifteen riffles . These riffles are placed… … Sluice . B — Box . C — Bottom of inverted box . D — Open part of it . E — Iron hoe . F — Riffles . G — Small launder . H — Bowl with which settlings are taken away . I — Black bowl in which they are washed .
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