A hydrocyclone with involute feeding.
A cyclone unit design with high efficiency.
Very fine specimens may now and then be obtained on the St. Kilda beach, where we once took an individual a foot in length. They are noticeable for the peculiar stinging powers which have obtained for them the nickname of seanettles, and, also, for the peculiar mode in which some of them are reproduced, viz., in alternate generations, neither
In some cases the gold in the ore is extremely fine sized, and using mercury to capture it makes sense. This is also true for operators processing large quantities of hard rock material. I've done up a web page on using Mercury to capture fine gold and you can view it here. (link to page)
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