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Alluvial gold deposits are widely distributed worldwide, featuring high grades, low investment thresholds, and fast return on investment. In this East Africa region project, Xinhai provided a full range of services, including process design, equipment supply, and on-site installation guidance, ensuring the plant was successfully commissioned and met production targets. The project adopted a combined gravity separation–amalgamation process, which features a short construction period, low cost, and fast economic return.
Raw Ore Screening: A circular vibrating screen is used to remove oversized stones and debris. The particle size is generally controlled below 25 mm to ensure subsequent sorting efficiency.
Washing & Crushing: A trommel scrubber washes and breaks down clay clusters, releasing free gold particles. The slurry concentration after washing is controlled between 30% and 40% solids.
Gravity Pre-enrichment: Centrifugal Concentrator is employed to recover coarse gold. After pre-enrichment, the gold concentrate yield is typically 1%–3% of the raw ore, with a gold recovery rate reaching 60%–80%.
Amalgamation: The gold-rich concentrate is mixed with mercury (Hg) to form amalgam (gold content: 30%–50%). The mixture is then filtered or distilled to separate and recover the mercury, yielding sponge gold.
Amalgam Distillation & Gold Recovery: The amalgam is heated in a sealed furnace at 300–400 °C, causing mercury to volatilize. The vapor is condensed and collected for reuse, leaving behind sponge gold.
Mercury Recycling & Environmental Protection: A closed-loop condensation and activated carbon adsorption system is installed to recover mercury and prevent environmental contamination in compliance with green production standards.
Xinhai Mining provided the complete 200t/h alluvial gold gravity separation equipment, detailed construction drawings, and on-site installation and commissioning services. Backed by its mineral processing design institute, modern manufacturing facilities, and rich international project experience, Xinhai ensured smooth plant construction and steady production ramp-up. In addition to this project, Xinhai completed another successful 200TPH alluvial gold washing line for a nearby mining company in East Africa region, demonstrating its comprehensive strength in design, manufacturing, and EPC service delivery.
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