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2. Gold dredge - Wikipedia

   en.wikipedia.org/wiki/Gold_dredge

   The original methods to perform placer mining involved gold panning, sluice boxes, and rockers. Each method involves washing sand, gravel and dirt in water. Gold then settles to the bottom of the pan, or into the bottom of the riffles of the sluice box. The gold dredge is the same concept but on a much larger scale.

3. Placer mining - Wikipedia

   en.wikipedia.org/wiki/Placer_mining

   A long sluice box runs along the mine. [16] The sluice box was used extensively during the California gold rush for larger scale operations. When streams became increasingly depleted, the grizzly and undercurrent variants of the sluice box were developed. The grizzly is a set of parallel bars placed at a 45-degree angle over the main sluice box ...

4. Gold mining - Wikipedia

   en.wikipedia.org/wiki/Gold_mining

   A rocker box uses less water than a sluice box and is well suited for areas where water is limited. A rocking motion provides the water movement needed for the gravity separation of gold in placer material. [45] Rocker boxes gained popularity during the California Gold Rush in the 19th century and remain in use today.

5. Recreational gold mining - Wikipedia

   en.wikipedia.org/wiki/Recreational_gold_mining

   This 156-troy-ounce (4.9 kg) gold nugget, known as the Mojave Nugget, was found by an individual prospector in the Southern California desert using a metal detector. Recreational gold mining and prospecting has become a popular outdoor activity several countries, including New Zealand (particularly in Otago ), Australia , South Africa , Wales ...

6. Mining sludge - Wikipedia

   en.wikipedia.org/wiki/Mining_sludge

   It has been particularly prominent in gold fields in Australia and California in the nineteenth century. [1] In the 1840s in California and 1850s in Australia, methods for extracting alluvial gold were developed which involved washing soil and gravel through sluice boxes using diverted streams and other water sources. The waste or tailings were ...

7. Hydraulic mining - Wikipedia

   en.wikipedia.org/wiki/Hydraulic_mining

   A miner using a hydraulic jet to mine for gold in California, from The Century Magazine January 1883. Hydraulic mining is a form of mining that uses high-pressure jets of water to dislodge rock material or move sediment. [1] In the placer mining of gold or tin, the resulting water-sediment slurry is directed through sluice boxes to