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Mining DocExplainer
Added: May 13, 20252025-05-13T12:22:24-04:00 2025-05-13T12:22:24-04:00In: Mining Operations

What is a sluice box in gold extraction?

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A sluice box is an engineered channel for extracting gold from placer deposits using gravity separation.  

Gold’s high density causes it to settle from water flow while lighter gangue is discharged as tailings. Riffles along the sluice bottom disrupt water flow, creating low-pressure eddies or vortices where gold particles are trapped (Forui Mining, 2020).

Efficiency depends on factors like sluice angle, water flow rate, riffle design (e.g., Hungarian, angle iron, expanded metal), and matting materials (e.g., miner’s moss, vortex mats). Optimal water flow must carry away waste but not fine gold. Key components include the channel, riffles, and matting (911 Metallurgist, n.d.).

Sluice boxes range from manual/portable stream sluices to high bankers (power sluices) using a pump for water supply, enabling operation away from direct water sources (Nevada Outback Gems, n.d.). Vibrating or pulsating sluices enhance fine gold recovery by preventing bed compaction (Forui Mining, n.d.).

Proper setup involves correct angle, water flow, and side-to-side leveling. Material should be classified and fed steadily (Gold Rush Trading Post, 2023).

Continuous monitoring of gold distribution and riffle condition is crucial. Clean-up involves removing and washing riffles and matting, then processing concentrates by panning (GoldGold.com, 2011).

How does the design of a sluice box help separate gold from lighter materials? Share your thoughts!

References:
911 Metallurgist (n.d.): http://www.911metallurgist.com/blog/gold-sluice-box-design/
Forui Mining (2020): https://www.foruimining.com/solutions/how-to-start-using-gravity-beneficiation-for-gold-extraction-from-placer-mine/1 (and https://www.foruimining.com/solutions/how-does-sluice-box-recover-placer-gold/)
Forui Mining (n.d.): https://www.foruimining.com/product/vibrating-sluice-box/
Gold Prospectors Forum (2016): https://www.goldprospectors.org/Forum/aft/1361 (and https://www.goldprospectors.org/Forum/aft/1370)
Gold Rush Trading Post (2023): https://www.goldrushtradingpost.com/prospecting_blog/view/64348/sluicing_techniques_and_tips
GoldGold.com (2011): https://goldgold.com/gold-prospectingfinal-cleanup-gold-recovery.html
Nevada Outback Gems (n.d.): http://nevada-outback-gems.com/design_plans/DIY_high_banker/highbanker.htm
Video rights: @ linghengmachinery (TikTok)
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