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Clay-bearing alluvial gold plant for Mbeya Region

A mercury-free gravity plant built around a rotary scrubber, which breaks down the clay that traps fine gold. Press Show ore flow to follow the gravel through the plant, one step at a time.

150 m³/h in a single line, built in one go.

Capacity
150 m³/h
Processed per month
78,000 m³
Prime power
500 kVA
First gold
about 6 months

Follow the gravel from the hopper to the gold room, one step at a time.

FEED & WASHRECOVERYWATER0-6 mm slurry6-20 mmconcentratetailingsrecycled waterRun-of-mine gravelloader feed+80 mm to wasteFeed hopper + grizzly30-40 m³ • 80 mm barsVibrating feeder150-180 m³/h • 15 kW+20 mm gravel to wasteRotary scrubber + trommelΦ2.2 × 6.5 m • 55 kW • 6 / 20 mmSlurry tank + pumps8-12 m³ • 1 duty + 1 standbyCentrifuges3 × STLB-80Sluices2 coarse + 3 scavenger runsShaking table2 × 6-SGold roomfurnace • locked storeDewatering screen7.5 kWSettling pondsprimary + polishingClean water pondrecycle pump 18.5 kW
Gravel / slurryGold concentrateWaterWaste / tailings

The process, step by step

  1. A loader tips run-of-mine gravel into the hopper. The 80 mm grizzly bars reject boulders, which go straight to waste.

  2. The vibrating feeder meters gravel into the scrubber at a steady rate, so the drum never floods or runs empty.

  3. Water and tumbling inside the rotating drum break the clay apart and free the gold. The trommel screen splits the washed gravel by size, and anything over 20 mm goes to waste.

  4. The 0-6 mm slurry, where most of the fine gold sits, is pumped to the centrifugal concentrators. They hold the heavy gold and let the lighter sand pass.

  5. The 6-20 mm fraction runs over the sluices, whose riffles trap the coarser gold and small nuggets.

  6. Concentrates from the centrifuges and sluices are upgraded on the shaking table. The gold then goes to the locked gold room for drying and smelting.

  7. Tailings are dewatered and the water settles through the ponds. Clean water is pumped back to the scrubber, so the plant reuses most of its water.

Full Scale Plant

Nameplate / turndown150 / 100 m³/h
Feed mass rate (1.50-1.70 t/m³)225-255 t/h
Rotary scrubberΦ2.2 × 6.5 m, 55 kW
Fine gold recovery3 × STLB-80 centrifuges
Coarse gold recovery2 coarse + 3 scavenger sluice runs, 2 tables
Installed / running load280-340 / 200-260 kW
Power supply500 kVA prime
Circulating water / makeup500 / 75-120 m³/h
Crew per shift7 + shared mechanic
Free-gold recovery envelope88-95%
The equipment

What each stage looks like

The six main machines, in the order the gravel passes through them.

A vibrating feeder delivers material from a hopper to a crusher at a controlled feed rate.
Stage 1

Vibrating feeder

Meters gravel from the hopper into the scrubber at a steady rate, so the drum never floods or runs empty.

A rotary scrubber washes gravel in a rotating drum to break up clay before screening and recovery.
Stage 2

Rotary scrubber and trommel

Tumbles the gravel with water to break up the clay, then splits it by size and rejects anything over 20 mm.

A slurry pump transfers water containing solid particles between stages of a processing plant.
Stage 3

Slurry pump

Lifts the 0-6 mm slurry, where most of the fine gold sits, from the tank to the centrifuges.

A centrifugal gold concentrator uses a spinning bowl and water to separate heavy gold particles from slurry.
Stage 4

Centrifugal concentrator

Holds the fine gold from the slurry and lets the lighter sand pass to tailings.

Sluices and jigs separate heavier gold particles from washed gravel using water flow and gravity.
Stage 5

Sluice

Traps the coarser gold and small nuggets from the 6-20 mm gravel in its riffles.

A gold shaking table separates heavy particles on a moving deck using water flow and gravity.
Stage 6

Shaking table

Upgrades centrifuge and sluice concentrates before the gold goes to the gold room.

Two ways to build it

Reaching 150 m³/h

Full Scale Plant, built at once

Build the full 150 m³/h plant in a single line with a larger scrubber, three centrifuges and two shaking tables. It is the lower cost per cubic metre and the simpler operation, and it suits a deposit whose grade and free-gold behaviour have already been confirmed by a bulk sample.

Starter Modular Plant, then a second line

Start with a 75 m³/h line and prove the grade on real production. Once the deposit is confirmed, add an identical second line beside it. The ponds, gold room and control container are built at full size from day one, so the second line connects without disturbing the first. Two independent lines also keep half the plant running while the other is being serviced.

Next step

Talk through the plant with our team

We can walk you through the flowsheet, the equipment list and the delivery schedule, and confirm the option that fits your deposit.

Contact us+255 759 141 705Browse equipment