6,500 Ton/Day Gold and Silver Plant


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This plant is designed to process 6,500 tons per day, to recover gold and silver in 4 basic stages:

- Size reduction

- Leaching in tanks

- Gold and silver recovery

- Tailings treatment

Below is a full description of the plant:


Stage 1: Size Reduction

Ore is received from the mine by conveyor, and fed by an apron feeder into a Nordberg C125 jaw crusher.

Crushed ore is then fed to a 21 x 11 ft Hardinge SAG mill by two feed conveyors.

A 16 x 24 ft Traylor bal mill receives ore from the SAG mill.

Pulp from the SAG and ball mills is fed to a cyclone bank, aided by Warman pumps.

A Falcon SB2500 is used to concentrate gold from the pulp.

Reagents are added to further dissolve gold and silver for recovery.


Stage 2: Leaching

An Outotech 25 meter thickener is used to produce gold and silver-rich pulp.

Seven 17 x 17.5 meter leaching tanks with cyanide dissolve gold and silver.

CCD recovery of gold and silver takes place at this stage, aided by five 23 meter Outotech thickeners.


Stage 3: Gold and Silver Recovery

Three Whittier pressure filters with diatomaceous earth are used as filtering media to deaerate and reduce oxygen in the ore.

Pumping and precipitation accessories are included with these items.

Gold and silver are removed from solution by three plate thickeners with 186 Sq.

Meters of filter area each, that employ diatomaceous earth and zinc-impregnated powder.

Two Summit Valley ovens with 1.1 cubic meter capacity each are used to eliminate mercury from the precipitates.

Two Morganite ovens with silicon carbide crucibles are used to cast gold ingots.


Stage 4: Tailings Treatment

Two agitator tanks with Atlas Copco air blowers are used to treat tailings, and employ sodium metabisulfate and copper sulfate as reagents.

Eight Metso 2040-54 VPA filters, 8 air compressors, a 24 meter Outotech paste thickener, and two slurry storage tanks allow 40% of the tailings to be impounded safely.

Conveyors can carry tailings to a curing house to be dried and treated before final disposal.

Water recovered from the presses is used in the plant, and is pumped by six pumps through a cyanide neutralization tank, before re-incorporation into the plant, or disposal into a waste water pond.

A precipitation process is used for water, and employs barium carbonate and calcium hypochlorite to eliminate sulfur and ammonia.

A coagulation process removes ferric sulfate and the water is then flocculated to increase its clarity.


Full Equipment List:

BTI Rock Breaker w. Hydraulic Controls and Control Room

Metso Apron Feeder

Metso Vibrating Grizzly Feeder

Nordberg C125 Jaw Crusher

Stacking Conveyor to Sag Mill

Tunnel Feeder + Feed Conveyor

Hardinge SAG Mill 6.4m Dia x 3.35m EGL (21 ft. x 11 ft.)

Terex Vibrating Pan Feeder

Sag Mill Return Conveyor

Fuller Traylor Ball Mill 4.88m dia x 7.47m EGL (16 ft. x 24 ft.)

Complete Spare Mill Available- Fuller Traylor 16 x 24.5 ft

2 x Weir (Warman) Cyclone Feeding Pumps

6 x Weir (Warman) 15 in. Cyclones

Sepro Falcon SB2500 Centrifugal Gravity Concentrator

Gekko ILR Inline Leach Reactor

Outotec 25m Dia High Rate Grinding Thickener

2 x Weir (Warman) 16 x 10 x 18 Slurry Pumps

6 x Outotec 23m Dia High Rate CCD Thickeners with Hyd. Lift

5 x Weir (Warman) 16 x 10 x 18 Centrifugal Pumps

Goulds 12 x 10 x 16 Centrifugal Pump

Rich Solution Tank 10m dia x 7.7m H

6 x Leach Tanks with Lightnin Mixers 16.8m Dia x 17.5m H. Tanks Dual Impeller, Rubber Lined, Air Sparge Down Shaft

2 x Agitator Neutralization Tanks and Mixers with Hansen Reducers

Lime System with Silos, Grinding Mill, Tanks, Pumps, etc.

Process Water Tank 12m Dia x 12m H

2 x Agitator Neutralization Tanks

Merrill Crowe System

3 x Whittier Pressure Leaf Filter Clarifiers, 174.6 m2 each.

2 x Goulds Precipitator Feed Pump 8 x 10 x 16

3 x J-Press Precipitator Filter Presses with Recessed Plate Filters, 186 m2 Each.

2 x Summit Valley Mercury Retort Dryers

2 x Atlas Copco Neutralization Blower

4 x Atlas Copco Process Air Compressors

2 x 69000 Volt GE Transformers


Metso Filter Plant for Dry Stack Tailings:

Automated Controls with Control Room or Manual Controls at Machine

Outotec 24m Dia Paste Thickener High Capacity Hydraulic Raise

2 x Filter Feed Tanks with Lightnin Mixers

Single Stage 4.2m Dia. 2 x Weir (Warman) Thickener Pumps

8 x Metso VPA 240-54 Pressure Filters

2 x Weir (Warman) 6/4 FHH Primary Filter Feed Pumps

16 x Weir (Warman) CCAH 3 x 2 Secondary Filter Feed Pumps

2 x Tipic 12m Dia. X 13m High Filter Feed Tanks with Agitators

2 x Conveyor Engineering 900mm Wide Filtered Material Conveyors to Filter Cake

A-Frame Storage Building

3 x Atlas Copco Compressors


Additional Equipment Available:

5 MW Cat Standby Generator Cooling Station


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