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Suzdal: Launch of HiTeCC Technology

June 2

8, 2

016

Louw Smith, COO

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Nord Gold N.V., a company organized and existing

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Disclaimer

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HiTeCC (High Temperature Caustic Conditioning or Hot Leaching) is an innovative

Outotec technology.

Suzdal is the second mine worldwide to launch a commercial Outotec HiTeCC circuit.

HiTeCC is expected to increase Suzdal production output by 9 - 14 koz of gold Doré

per year for at least 10 years.

HiTeCC LoM AISC is expected to be approximately US$420/oz.

HiTeCC Technology Launch – Key Messages

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HiTeCC Technology History

A hot caustic leaching process was developed, trialed

and implemented at Crocodile Gold Corp's Fosterville

BIOX® operation in Bendigo, Australia (currently

Newmarket Gold).

In 2008 and 2009 the Fosterville team developed the first

hot caustic leaching plant. The heated leach process was

able to recover approximately 40% of the previously

lost CIL tails gold.

Commissioning of the hot caustic leach circuit in 2009

resulted in an approximate 10% increase in the total

leach gold recoveries for the Fosterville operation.

In 2012 BIOMIN, following an agreement with Crocodile Gold

Corp, commenced further development of the technology

which saw the birth of the High Temperature Caustic

Conditioning (HiTeCC) process for treatment application of

double refractory ores.

Through the BIOMIN HiTeCC process, gold is efficiently

desorbed from the organic carbon by manipulating the ionic

strength and temperature of conventionally treated CIL

product slurries.

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HiTeCC Technology

The Suzdal operation currently operates three Outotec licenced processes, BIOX® process for

liberation of the refractory gold occluded within the ore sulphide matrices, ASTER for Thiocyanate and

free cyanide destruction and HiTeCC.

Preg-robbing is commonly described as the process whereby dissolved gold species (typically as the

complex Au(CN)2-) is adsorbed onto naturally occurring fine disseminated organic carbon contained in

the ore. In most cases, the degree of adsorption is weak and the preg-robbing is reversible in the

presence of highly active adsorbents, such as activated carbon or resins.

Gold is efficiently desorbed from loaded activated carbons in the presence of an ionic solution

(generally caustic soda). High temperatures dramatically increase the rate of desorption as does the

rate of desorbant (eluant) flow. A logical extension of this was therefore to add caustic soda and heat

the pulp that contained preg-robbed gold to facilitate the gold-cyanide species release. This has been

the preferred treatment route for the BIOX® at Fosterville Gold Mine in Victoria who in 2010 installed

the first commercial circuit for the recovery of the preg-robbed gold.

Today this processing route is known by the acronym HiTeCC (High Temperature Caustic Conditioning)

and using best industry practice.

Extensive laboratory and pilot scale trialling was commenced by Suzdal in 2012, followed by a pilot

plant in 2014 confirming recoveries between 40% to 70% gold from current and old CIL tailings

material.

The project was approved in 2015. With the assistance of BIOMIN (design criteria and control

philosophy), SGS South Africa (equipment specification) and Kazmekhanobr (a Kazakhstan design

institute), detailed designs were completed in December 2015. The construction was managed by an

in-house team.

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Composition of CIL tail for 2 samples

Compounds,

%

Sample 1 -

Tailing dam

tails

Sample 2 -

CIL tails

20.08.2014

Au (g/t) 4.30 7.56

St 7.25 6.58

S2- 0.21 0.18

As 0.41 1.08

Ct 0.93 1.26

Corg 0.60 1.02

CO32- 0.33 0.25

Diagnostic Leach of the CIL tail

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Avg. CIL tail2014

Silicates

Carbonates

Sulphides

OrganicCarbon

Free Gold

Laboratory Test Work – Diagnostic Leach

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Industrial Trial Test Parameters

Parameter Data

Stages 2

Tanks per stage 1

Temperature 60-85 oC

Heating strategy

Heating coils

configuration/ direct

steam to tanks

Carbon

concentration 30-40 g/L

NaOH

concentration 0-45 kg/t feed

NaCN

concentration 0-1,000 ppm

Maximum carbon

load 200-500 g/t

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Parameter Value

Plant productivity 93.4%

Solids capacity 16 t/h

133 ktpa

Carbon regeneration 100%

Liquid / Solid (L:S) ratio

of feed

3 :1

(30% solids)

Tailing Dam / Current

CIL tails 1 : 1

NaOH addition 30 kg/t feed

NaCN in feed 500 ppm

Gold recovery 40-70%

Design and Operating Parameters

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Design and Operating Parameters

Parameter 1st Stage

Desorption

2nd Stage

Adsorption

Number of tanks 3 3

Volume of tanks 260 m3 260 m3

Retention time 12 hour 12 hours

Temperature 80-85 oC ≤30 oC

Carbon 40 g/L 40 g/L

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Suzdal HiTeCC Flow Sheet

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Design and Operating Parameters

Expected Au grade feed into HiTeCC 7.5 g/t

Expected Au grade leaving HiTeCC 3.0 - 4.5 g/t

1st Stage recovery across desorption 26 – 40 %

2nd Stage recovery across adsorption 14 – 30 %

Cumulative recovery across HiTeCC 40 – 70 %

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Name Unit Value

Historical Tailing dam Reserves

CIL tailings from beginning Suzdal BIOX project kt 637

Grade g/t 7.17

Contained gold koz 153

Annual Planned Feed

Historical Tailing dam

CIL tons from beginning Suzdal BIOX project tons 56

Grade g/t 7.17

Recovery % 50

Gold produced koz 6.5

Current tails

Process tpa 56

Grade g/t 5.6

Recovery % 50

Gold produced koz 5

Effect on overall recovery % 6.4

Total Gold Production by HiTeCC plant koz per annum 9-14

Recovery and effect on gold production at Suzdal

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Project Development Schedule

Stage Company Dates

Lab testing Suzdal May 2012 on going

Industrial Trail Suzdal Feb 2013 Mar 2016

Design Draft BIOMIN Sep 2014 Apr 2015

Equipment selection SGS Time Mining Apr 2015 May 2015

Detail design Kazmekhanobr Apr 2015 Dec 2015

Construction Metallist July 2015 Apr 2016

Commissioning Suzdal June 2016

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Questions