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Placers can be found in virtually any area where gold occurs in hard rock (lode) from the accompanying rock and flattened by the incessant pounding of gravel. A small screen cut to nest in the upper part of a gold pan can be useful for the
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Placer or alluvial mining (not including dredging) is the mining of stream beds, and heavy metals like gold are considerably denser than the sand and gravel A trommel consists of a slightly-inclined rotating metal tube with a screen at its
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Once a placer deposit is loed by gold panning, the miner usually shifts to equipment that can treat volumes of sand and gravel more quickly and efficiently.
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Wide, shallow pans are filled with sand and gravel that may contain gold. Larger commercial placer mining operations employ screening plants, or trommels,
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Using A Trommel For Placer Processing - April 2010 (Vol. 79, No. 8
How to use a trommel to process placer gold deposits. Their purpose is to screen out and wash off larger rocks. In a sluice box, you want to generally keep the speed of the gravel slurry down to that minimum speed necessary to keep
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