Buying a gold wash plant for sale is a decision about your deposit, not the seller's brochure. A wash plant uses gravity to recover placer and alluvial gold, but the right plant depends on clay content, particle size, gold size and water supply. Global gold mine production reached an estimated 3,300 tons in 2024, according to the USGS, and much of that still starts as free gold in sand and gravel. Before you commit, look at the flowsheet, not just the price tag.
What a Gold Wash Plant Does
Gravity separation, as used in alluvial gold plants, is a method that separates minerals by density difference using gravity, centrifugal force or other force fields. Unlike flotation or cyanidation, it needs no chemical reagents, which keeps environmental compliance simpler and operating costs lower for suitable ores. A gold wash plant recovers gold from placer and alluvial material using this principle. It washes, scrubs and screens the feed, then recovers free gold using sluices, jigs or centrifugal concentrators. Placer gold is already liberated; it just needs separating from the sand and gravel around it. Screening often starts with a rotary trommel or vibrating screen to reject oversize, followed by a gravity device chosen for the gold size in the deposit.
Screening and classification are not afterthoughts. Screen selection depends on aperture size, feed size distribution, throughput, screening efficiency, material moisture and clay content, installation angle, deck layers and screen surface wear life. A high-clay feed can blind a screen in minutes, so scrubbing may have to happen before sizing. For more on the wider recovery routes, see gold recovery methods.
Feed Characterisation Before You Buy
Three measurements matter before you sign anything.
- Particle size distribution. Different gravity devices work best in different size ranges. A P80 of 75 µm means 80% of the feed is finer than 75 µm, and that number directly narrows the equipment list. Jigs suit coarse feed, shaking tables suit fine feed, spirals suit medium feed.
- Clay content. High-clay feeds need scrubbing before screening or classification. Sticky clay can blind screens and carry gold out of the tailings launder.
- Gold particle size. Coarse free gold can be recovered with sluices; fine gold often needs centrifugal concentrators. If the gold is finer than 100 µm, a sluice may not be enough.
Water supply is the fourth check, but it's often the one that kills a project. Wash plants are water-hungry. The site must support the water demand for the selected equipment, and that demand changes with feed rate, clay content and recovery target. Before you look at a gold wash plant for sale, know your water licence limits.
Testwork does not have to be elaborate. See how to test gold ore for a practical sequence.
Gravity Equipment Options
The table below lists common gravity devices and the particle size range where each is typically used. These ranges are broad engineering guides, not fixed guarantees.
| Equipment | Typical particle size range |
|---|---|
| Sawtooth wave jig | Coarse |
| 6-S shaking table | Fine |
| Spiral chute | Medium |
| Stirred sluice | Fine |
| Water jacket centrifugal concentrator | Fine |
| Centrifugal concentrator (Knelson type) | Fine |
| Suspended vibrating bed machine | Fine |
| Suspended vibrating cone concentrator | Fine |
Equipment selection is driven by density difference, liberation size, particle size range, feed concentration, throughput per unit area, stroke and frequency, water consumption and recovery target. A high-clay alluvial feed may need a scrubbing trommel before a jig. A fine-grained beach sand may go straight to spirals. There is no universal best machine; there is only the machine that matches the feed you actually have.
Why Testwork Still Matters
Even for a placer deposit, a quick characterisation of the material prevents buying the wrong plant. A plant bought on guesswork leaves gold in the tailings regardless of the equipment's marketing. Xinhai reports its CNAS-accredited laboratory handles around 5,000 element analyses per month and roughly 200 metallurgical test programmes per year. That scale exists because the same ore type can behave differently from one valley to the next.
China was a major gold producer in 2025 and accounted for around 10 per cent of total global production, according to the World Gold Council. Placer deposits are found on every continent except Antarctica, but the clay, gravel and gold size vary enough that local testwork remains the cheapest insurance.
For a structured approach to characterising your ore, see how to test gold ore.
New vs Used Gold Wash Plants
A new wash plant is engineered to your material and carries a warranty. A used plant may be cheaper but comes with unknown wear and a flowsheet matched to someone else's deposit. The screening deck may be worn, the sluice mat may have settled, and the trommel drive may have been patched after a hard season. For a commercial operation, the cost of mismatched equipment usually exceeds the saving.
Wear is not cosmetic.
If you are building a long-term operation, a used gold wash plant for sale can still work, but only after a full inspection of the scrubbing, screening and recovery sections. Ask for maintenance records, not just the asking price. Then compare the actual flowsheet against your feed characterisation from testwork. If the plant cannot match your tonnage and water supply, the discount disappears quickly.
Matching Plant Scale to Your Site
Throughput must match your target tonnage, not the seller's headline number. A 50 t/h plant on paper may deliver far less on a high-clay feed because the scrubber becomes the bottleneck. Shandong Xinhai Mining Group reports its three manufacturing bases cover roughly 110,000 m² and support mining projects up to 50,000 t/d. That range matters because a small alluvial operation and a commercial mining project need completely different plant layouts.
Check the water supply before anything else. A gravity plant needs enough water to fluidise the feed, wash the oversize and carry fines to the recovery device. If your site has seasonal water limits, a spiral chute circuit may fit better than a high-volume sluice. For a sense of scale, see 500 t/d gold plant capacity and 1,000 t/d gold plant capacity.
For a commercial operation, also consider access to power, spare parts and skilled operators. A modular plant can reduce site construction time, but the gravity circuit still has to be sized for the actual feed rate and clay content you measured.
Cyanide Is Not Part of a Wash Plant
A gold wash plant recovers gold by gravity, not by chemical leaching. That is the whole point. If your deposit carries fine gold locked in sulphides or the free gold is too small for gravity alone, you may need a different circuit. CIL/CIP recovery can reach 99% on suitable ores, but that is a cyanidation plant, not a wash plant. Cyanide is highly toxic, and its production, transport, storage and use are covered by the International Cyanide Management Code, a voluntary industry programme for gold and silver mining operations. Before you decide that gravity is not enough, get the gold size and liberation data from a proper test programme. Then compare a gravity route with a CIL vs CIP circuit on the same feed.
Working With Xinhai
Xinhai reports it has served 2,500+ mines, delivered 600+ EPC+M+O projects, worked in 100+ countries and employs 700+ technical experts. The design institute holds a Class B metallurgical qualification in China, and the company's laboratory holds CNAS accreditation to ISO/IEC 17025. For a gold wash plant for sale, the useful starting point is your material type and target tonnage, not a standard brochure. Tell us your feed characterisation and water limits, and an engineer will recommend the right gravity route.
For a full proposal, get in touch through contact or review the gold processing plant solution page. Shandong Xinhai Mining Group can also supply the larger milling and leaching circuits if your project moves beyond alluvial material.