Suction dredging, on the other hand, can damage streams and impair fish and other aquatic life. Gold panning or the use of sluice boxes most often has a negligible effect on the surrounding land, water and wildlife. The machine runs the material through a separation system to recover the valuable materials, and then jettisons the sediment and gravels back into the water as tailings or spoils. Suction dredging is a relatively new mining method that uses a suction dredge machine – similar to a large underwater vacuum cleaner – to suck material up from a river or stream bottom. Small-scale mining, also known as recreational mining, refers to a variety of types of mining operations ranging from gold panning as a weekend hobby, using a sluice box, or operating a suction dredge to mine for gold at the bottom of a streambed.
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