TENOVA is a worldwide supplier of advanced technologies, products and engineering services forthe iron & steel and mining industries.

Processing Gold OreTotal technology solutions across the mining value chain

2PROJECT SERVICES

Consulting: ore-body, production and market evalua-tion to assess project viability.

Test work supervision: Tenova Mining & Mineralsengineers arrange and oversee laboratory, pilot plantand on-site test work.

In-house laboratory for cost-effective and promptscoping work, as a basis for structuring projectdefinitions.

Pre-feasibility and feasibility studies. Technology supply packages: incorporating basic

engineering design, process guarantees, proprietaryequipment definition and supply, and commissioningsupport.

Process plant design and project management: allphases of the project, from inception through designand construction to commissioning, maximising thesuccess and profitability of the venture.

Comprehensive spares and after-sales back-up. Process audits to Best Practice guidelines and the

Cyanide Code.

PROJECT FINANCE

Tenova Mining & Minerals assists clients to structure,negotiate and secure optimal and cost-effective financialpackages for projects of all sizes.

FLEXIBLE CONTRACT STRUCTURING

Reimbursable, fixed price or any combination to suitclient needs.

Joint ventures on projects.

PROCESSING TECHNOLOGIES

For beneficiation of gold ore, Tenova Mining & Mineralsliaises with suppliers and evaluates equipment to makeunbiased selections of the best equipment for the job.

For stockpiling, materials handling, environmentalprotection and waste disposal, Tenova Mining &Minerals draws upon its comprehensive in-house andlicensed range of engineered technologies or selectsthe most appropriate equipment from other suppliers.

3Tenova Mining & Minerals is a total integrated solutions provider to the global mining, bulk materials handling andminerals beneficiation and processing sectors, offering innovative technological solutions and full process andcommodity knowledge across the mining industry value chain.

Tenova Mining & Minerals range of services for gold ore processing covers all processes needed for the recovery ofgold, from ore to bullion (dor) and fine gold, converting run-of-mine (ROM) ore into saleable products, integratingengineering and process know-how in development and optimisation of plant designs, and delivering processing facilitiesto global environmental standards.

4ORE HANDLING AND PREPARATION

Materials Handling Tenova Mining & Minerals designs and supplies completematerials handling systems. Conveyor systems to move ore and tailings to, from

and within the processing plant. Stacking and reclaiming systems for efficient,

effective and economic reclaiming of bulk materials. Plants to process tailings and extract coarse material

for use as backfill.

ComminutionTenova Mining & Minerals selects and designs energy-effective and cost-effective systems for mechanicalliberation and exposure of gold from all types of gold ores. Fine crushing only (up to four stages), usually for heap

leach applications. Conventional crushing and milling. Autogenous and semi-autogenous milling. Computer modelling of proposed comminution circuitsmaximises use of available data.

5Pre-concentrationTenova Mining & Minerals designs effective pre-concen-tration processes that significantly reduce the size of agold-recovery plant. Flotation

Conventional mechanical and column flotationcells.

Dense-media separation (DMS) Tenova Mining & Minerals DMS technology is

applied highly successfully to gold ores, particularlyfor retreating waste rock.

Gravity concentration Gravity-separation techniques including tables,

jigs, centrifugal concentrators and sluices.

6GOLD EXTRACTION

Tenova Mining & Minerals provides leaching plants for alltypes of gold ores.

Pretreatment of Refractory OresTenova Mining & Minerals has a depth of experience inrefractory ore projects that is equal or superior to most ofthe other engineering companies. Bacterial oxidation

Tenova Mining & Minerals applies all current tech-nology, e.g. from Mintek and Bactech, as well asGold Fields BIOX process.

Pressure oxidation Tenova Mining & Minerals has successfully

applied pressure oxidation for gold processing.

Roasting (including whole ore roasting) Traditional roasting technology where acid

recovery results in a saleable product. Arsenic-stabilising technologies to minimise

environmental pollution. Emerging technologies

Thiosulphate leaching, Augment, the Albionprocess, resin-in-pulp, Activox and others. TenovaMining & Minerals also accesses other proprietarytechnology for treating refractory ores andconcentrates.

7Leaching Conventional cyanidation

Using air agitated pachucas or high-efficiencymechanically-agitated vessels.

Thiosulphate leachingAlternative lixiviants to leaching, preg robbing andhigh copper-gold ores.

Heat leaching Simple and relatively low cost.

Carbon extraction processing Tenova Mining & Minerals offers state-of-the-art

expertise in Carbon-in-leach (CIL). Carbon-in-pulp (CIP). Carbon-in-column (CIC).

Plants incorporate industry standard technologyfor carbon-gold processing. Efficient mechanically-agitated adsorption

vessels. Static-air or mechanically-swept interstage

screens. Efficient desorption procedures.

8GOLD METAL RECOVERY

Tenova Mining & Minerals has considerable experience indesigning all unit processes, such as electrorefining, aciddigestion, calcining, smelting and slag treatment, neededto recover gold from clarified solutions to produce saleablemetal.

Recovery from Solution Electrowinning

Tenova Mining & Minerals incorporates well-proven electrowinning cells in its process designs,such as the Zadra, AARL and Mintek cells.

These offer operation at high temperature and varying

electrolyte strength. reduced gas-explosion hazard. no anodic-cyanide destruction. coherent gold deposition at higher current

densities. minimal sensitivity to process disturbances.

Zinc precipitation Tenova Mining & Minerals supplies Merill-Crowe

plants for recovery of gold from cyanide leachliquors.

Carbon elution Tenova Mining & Minerals carbon elution plants

utilise AARL batch elution process. Zadra (pressure and atmospheric) process. AARL continuous elution process.

Tenova Mining & Minerals applies batch test workto optimise design of continuous processingplants of this type and computer models to predictperformance of full scale plants.

A distribution agreement with Como EngineersPty Ltd of Australia provides Tenova Mining &Minerals clients with access to its modular goldelution, carbon regeneration and refining plants.

GOLD REFINING

Tenova Mining & Minerals supplies process design forplants to refine dor or bullion to pure (999.9 fineness)gold.

9ENVIRONMENTAL PROTECTION

Cyanide Recovery and DestructionFor environmentally-sensitive areas, Tenova Mining &Minerals supplies both proprietary and in-housetechnology for recovery or destruction of cyanide in goldprocess plants. This includes the licensed SXCN processdeveloped by Placer Dome Technical Services.

Dust and Air Pollution ControlDust control systems for furnaces, smelters, mills,conveyors, assay and chemical laboratories are designedand supplied by Tenova Mining & Minerals. A comprehensive range of scrubbers, bagfilters andcartridge filters is available.

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MODULAR GOLD PLANTS

Tenova Mining & Minerals Modular Plants for extractionand recovery of gold are trial erected and watercommissioned at the fabricators premises and thenpartially dismantled and shipped as container-sizedsections, for re-assembly and final commissioning on site.Each Tenova Mining & Minerals Modular Plant is custom-designed for a specific application. Additional modularisedcomponents can be incorporated later to increase plantthroughput or to accommodate higher grades.

Applications Fast-track operations. Hard-rock feedstocks. Sites where construction is difficult, such as remote

locations with adverse climatic or geographicconditions.

Relocation after economic reserves have beendepleted.

Comminution Maximum plant capacity of about 1,000 t/day or

45 t/h of feed ore. Multiple mills used for higher throughputs. Conventional crushing and milling available, but roller-

mounted mills preferred for transportability andsimplified site installation.

Intensive Processing Pre-concentrating gold into a small volume of concentratefor intensive processing results in More compact operation. Minimised reagent exposure, containment and

elimination. Reduced leach times and circuits. Possible direct gold recovery via electrowinning (EW),

avoiding carbon adsorption, stripping and regeneration.Pre-concentration processes include flash and conven-tional flotation, Knelson / Falcon centrifugal concentratorsand in-line pressure jigs during multistage gravity concen-tration.

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Leaching High-intensity cyanide leaching contactors treat thecombined gravity and flotation concentrate, reducingleaching times to between 5 and 8 hours.

Gold Recovery Belt filtration with counter-current washing recovers

gold and silver bearing filtrate. Carbon or resin recovers gold and silver from filtrate. With intensive leaching, direct EW of the filtrate

virtually eliminates gold lockup in the carbon inventoryand theft from batch-gravity devices.

Calcining the steel-wool cathodes and direct smeltingproduces gold / silver dor.

Waste Disposal Gold-depleted tailings are produced as a filter cake fordisposal by dry stacking (for backfill) or pumping to atailings dam.

With proven detoxification techniques, cyanide in processplant tailings is reduced to less than 10 ppm of freecyanide, well within world environmental limits.

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www.tenovagroup.com

TECHINT GROUP

Tenova Mining & MineralsEmerald Parkway RoadGreenstone Hill, Ext 21 1609PO Box 7737Johannesburg 2000South AfricaPhone +27 11 899 9111Fax +27 11 899 2302enquiries.TMM@za.tenovagroup.com