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Nichromet Extraction Gold Technology

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Nichromet Cyanide-FreeGold Extraction Technology

Nichromet Extraction Inc.3700, Lac Noir StreetThetford Mines (Qc)418-423-7247www.nichromet.com

A green alternative to the classical cyanide

approach

Give access to oresrefractory to cyanidation

Less costly than theclassical processes withoutenvironmental mortgage on

residues

Can be implemented as modular plant

Vision

Develop an economic alternative to classical cyanide process for gold extraction, while keeping a sustainable development approach minimizing the impact on the environment.

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Overview of the Process

Sulphides Ores

Controlled Oxidation

AcidLeaching

Base Metals

Halogens Treatment

Sulfuric Acid

Precious Metals

Inert Tailings

Nichromet Process Flowsheet

REALISE PAR

David Lemieux

PAGE

1 SUR 1

DATE DE MODIFICATION

2013-02-12

TITRE

Sector 00 : General Flowsheet

# DE DESSIN

Bag House

To Atm

To Arsenic Stabilization

Copper Extraction

ChlorinationReactor

Deaeration Tank

Larox filter

Pregnant Brine

Holding Tank

Carbon to Gold

Recovery

Reverse Osmosis

Polishing Filtration

Na2CO3

Ca(OH)2

ElectrolysisCell

OxidationFluidized Bed

Arsenic Scrubber

SO2 Scrubber

Concentrate

From Concentrtor

Tailings

HypohalidesHolding Tank

Concentrated Brine

Holding Tank

IronPrecipitator

Carbon In Column

Gypsum

Iron Precipitation

Copper Cementation

Blister Copper

IronRemoval

CalciumPrecipitator

Polished Brine

Holding Tank

Hematite

OxidationPre-Treatment

CopperRemoval

Gold Circuit

Advantages Over Cyanide

Faster Reaction Time Process time of few hours instead of few days

Legal issues Cyanidation has been banned in many countries

and some States in USA (ex:Wisconsin)

Extraction of silver and PGM if present

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Environmental Advantages

No cyanide No tailings pond (elimination of spillage hazard) No liquid effluent Solids residues devoided of sulphides and base

metals No acidic lixiviate or contaminants from tailings site

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Characteristics of the Nichromet Technology

Green• Cyanide-free process• Sulfide is recycled as sulfuric

acid • No waste water, no tailing

pond and no air pollutants• Solid wastes : inert and

stable, even when using high arsenic ores

Fast• Leaching time of 2 hours instead of 2 days for cyanide

Flexible• Can handle base metals

(bulk flotation : higher efficiency)

• Can treat carbonaceous ore

• Can handle telluride contamination

Profitable• Process cost ($/oz gold)

similar to cyanide• Capital cost lower (10-15%)

than cyanide

Successfully piloted at the ton scaleon a wide range of materials

Sources TypeGrade (g/T)

Barren Solid (g/T)

Yield (%)

1: Canada (Quebec)

Ore 2,58 g/T 0,07 g/T 97,5 %

2: Canada (Quebec)

Ore 3,45 g/T 0,34 g/T 93,2 %

3: Canada (Quebec)

Ore 13,9 g/T 0,79 g/T 95,4 %

4: Canada (Ontario)*

Conc. 55,3 g/T 4,79 g/T 94,0 %

5 : Eastern Europe*

Conc. 7,5 g/T 1,48 g/T 91,0 %

6: Canada (Quebec)*

Conc. 53,5 g/T 3,56 g/T 94,1 %

*Flotation concentrates requiring pre-treatment by oxidation

Environmental Recognition

Grant of 700 k$ from Green Technologies Demonstration Program of Quebec Government in 2011-2012

Grant of 5 M$ from Sustainable

Technology Development Fund of

Federal Governement in 2013

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Current gold estimated resources (3,2 MT) Gold : 339 000 oz Au @ 3,27 g Au/T Copper : 28 Mlbs @ 0,4 %Cu

Exploitation permit in force

Mining plan Near surface resources (open pit potential, low operating cost)

20 M$ investment done in exploration to date

Somine Haïti Project vs Nichromet Technology

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Phase IBring the top layer of the deposit into production

with a modular plant to process oxides concentrate

15 M$ investment for the modular plant onlyPotential of 25 000 oz Au/year

Phase II1000 TPD Mine and full scale processing plant Gold production rate of 35 000 oz Au/yr Investment for Nichromet processing plant of 35

M$

Nichromet is currently conducting a demonstration program for the application of its technology on the Faille B deposit.

Great Potential for a Nichromet plant in Haïti

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Toward a Greener Gold Industry