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Publié le 14 mars 2011

Dutwa economic model update

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Mots clés associés :   Cobalt | Nickel |

 

 

Dutwa economic model update

 

 

UPDATED ECONOMIC MODEL FOR THE
DUTWA NICKEL PROJECT, TANZANIA

 

African Eagle Resources plc (AIM: AFE; AltX AEA) announces that it has received the second iteration of the feasibility study economic model for its Dutwa nickel project in Tanzania from independent engineering consultant Simulus. The latest economic model evaluates both of the ore process routes available to the Company, heap leaching as well as atmospheric agitated tank leaching ("tank leaching") and includes ore throughputs of up to 5Mt per annum.

In this announcement, the currency is US dollars and all net present values ("NPVs") are at a 10% discount rate.

Key headlines:

Ore Throughput - 3Mtpa

Heap Leach

Tank Leach

Nickel price

$/lb

$10

$8

$10

$8

NPV post-tax

$M

705

260

870

385

IRR post-tax

%

26

17

29

20

  • Capex estimates for heap leach of $550M and for tank leach of $600M
  • Capital payback for both methods is between 3 and 5 years
  • Cash operating cost estimates of $3.37/lb for tank leach and $3.56/lb for heap leach
  • Throughput boost from 3Mtpa to 5Mtpa improves economics but increases logistics challenge

African Eagle's Managing Director Mark Parker commented:

"This latest economic modelling indicates that atmospheric tank leaching, rather than heap leaching, will give a better economic return at Dutwa. Our final selection of the best process option will be based on the outcome of bench-scale and pilot-scale metallurgical testwork now commencing in Perth, WA, leading to a pre-feasibility study, scheduled for completion by end Q3 2011.

A higher throughput of 5Mt per annum would improve the project returns, but under present conditions, logistical challenges are likely to make 3Mt per annum a more realistic production target. The throughput could be scaled up if proposed infrastructure developments allow."

The results reported here represent an expansion of the economic model announced in December 2010, to include heap leaching as well as agitated tank leaching and ore throughputs between 2Mt per annum and 5Mt per annum. In all cases, the model assumed that a mixed nickel-cobalt hydroxide intermediate product would be generated.

The mining and processing schedules used in the model were developed by Snowden Mining Industry Consultants (Perth, WA) from the Whittle pit optimisations, as recently announced.

The capital and operating cost estimates were made by AMEC Minproc (Perth, WA), to approximately �20%, using the best data currently available. The estimates indicate that the initial capital cost of a tank leach operation is not likely to be more than 10% greater than the cost of a heap leach operation for 3Mtpa or 5Mtpa throughputs. The capital intensity values for both process routes are far lower than those published for comparable projects which use the more expensive high pressure acid leach process.

The full results of the modelling for tank and heap leach, for throughputs of 3Mtpa and 5Mtpa are given in the tables below, on a 100% project ownership basis with debt financing not considered.

Over the coming months, the Dutwa economic model will be further developed and refined to take into account the results of the current metallurgical testwork and to assess the impact of producing a mixed sulphide intermediate product rather than a hydroxide and of using rail transport rather than road.

The next major milestones for the Dutwa Project are:

  • Commencement of the Environmental and Social Impact Assessment (Q2 2011)
  • Completion of JORC indicated resource estimation (Q2 2011)
  • Completion of Pre-Feasibility Study (Q3 2011)
  • Commencement of Definitive Feasibility Study ("DFS") (Q4 2011)
  • Completion of DFS (end Q4 2012)
  • Seek project financing during 2012
  • Construction of the plant and other infrastructure (2013-2014)
  • First production (Q1 2015)

Economic model results: Tank Leach

Ore Throughput

3Mtpa

5Mtpa

Nickel price

$lb

$10

$8

$10

$8

NPV post-tax

$M

870

385

1125

475

IRR post-tax

%

29

20

31

20

Payback period

Years

3.1

4.9

2.7

4.2

Capital expenditure

$M

600

600

840

840

Capital intensity

$/lb nickel/yr

11.7

11.7

10.4

10.4

Cash operating costs, $/lb contained nickel

$/lb

$/lb

Consumables

0.08

0.09

General & Admin

0.20

0.16

Labour

0.12

0.08

Maintenance

0.26

0.23

Mining

0.23

0.22

Power

0.01

0.01

Reagents

1.63

1.65

Transportation

0.99

1.01

Cobalt credits

-0.15

-0.15

TOTAL

3.37

3.30

Model assumptions and parameters

Mine life

Years

26

17

Ore mined and processed

million tonnes

78.2

82.2

Strip ratio

waste/ore

0.43

0.45

Intermediate Product

MHP

MHP

Nickel payability

% of LME nickel price

75

75

Average nickel grade

%

0..97

0.95

Total contained nickel in product

000 tonnes

603

623

Average cobalt grade

%

0.03

0.03

Total contained cobalt in product

000 tonnes

15.0

15.7

Life of mine capital cost

$M

659

918

 

Economic model results: Heap Leach

Ore Throughput

3Mtpa

5Mtpa

Nickel price

$lb

$10

$8

$10

$8

NPV post-tax

$M

705

260

920

310

IRR post-tax

%

26

17

27

17

Payback period

Years

3.2

5.2

2.8

4.5

Capital expenditure

$M

550

550

770

770

Capital intensity

$/lb nickel/yr

11.5

11.5

10.3

10.3

Cash operating costs, $/lb contained nickel

$/lb

$/lb

Consumables

0.14

0.14

General & Admin

0.21

0.16

Labour

0.12

0.08

Maintenance

0.25

0.21

Mining

0.24

0.23

Power

0.08

0.06

Reagents

1.64

1.68

Transportation

1.03

1.06

Cobalt credits

-0.15

-0.15

TOTAL

3.56

3.47

Model assumptions and parameters

Mine life

Years

25

17

Ore mined and processed

million tonnes

72.1

78.3

Strip ratio

waste/ore

0.52

0.48

Intermediate Product

MHP

MHP

Nickel payability

% of LME nickel price

75

75

Average nickel grade

%

0.99

0.97

Total contained nickel in product

000 tonnes

543

574

Average cobalt grade

%

0..03

0.03

Total contained cobalt in product

000 tonnes

13.5

14.4

Life of mine capital cost

$M

603

839

Qualified Person

Information in this report is based on financial simulations prepared by Tim Newton, BEng (Chem), MSc (Min Econ). Tim Newton is a Member of the Australasian Institute of Mining and Metallurgy (AusIMM) and is Technical Director and a full-time employee of Simulus Ltd. Tim Newton consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.

 

Technical terms

A glossary of technical terms used by African Eagle in this announcement and other published material may be found at www.africaneagle.co.uk/p/glossary.asp

 

For further information on African Eagle, see the Company's web site www.africaneagle.co.uk or contact one of the following:

Chris Davies (Operations Director)
Bevan Metcalf (Finance Director)
African Eagle Resources plc, London

+44 20 7248 6059
+44 77 5640 6899

Andrew Chubb / Bhavesh Patel
Canaccord Genuity Limited

+44 20 7050 6500

Guy Wilkes
Ocean Equities Limited, London

+ 44 20 7786 4370

Charmane Russell / Marion Brower
Russell & Associates, Johannesburg

+ 27 11 8803924
+27 82 8928052

 

Dutwa Project Overview

African Eagle is developing the major Dutwa nickel project in Tanzania. The Company discovered Dutwa in 2008 and is now conducting a pre-feasibility study for the project.

Economic modelling in late 2010 indicated a pre-tax project NPV of $650 million at a nickel price of $8/lb, with an estimated average cash cost of $3.37/lb nickel. The model was based on throughput of 3 million tonnes per year for 26 years with processing by atmospheric tank leaching to a mixed hydroxide intermediate product, requiring estimated initial capital expenditure of $600M and yielding life of mine earnings of $8.2bn at $8/lb nickel. The mining schedule was derived from Whittle optimisations of block models of an October 2010 inferred mineral resources. The financial models will be progressively improved as the feasibility study progresses.

Mineral resources are currently 98.6 million tonnes grading 0.93% nickel and 0.02% cobalt, of which 46.2 million tonnes are in the JORC indicated category and the remainder in the JORC inferred category. The Company believes that further drilling will increase the total resource by up to 10Mt.

The Dutwa project consists of two nickel laterite deposits which form the caps of two ridges about 7km apart. The current JORC mineral resources, at a 0.43% nickel equivalent cut-off, are 98.6Mt grading 0.93% nickel and 0.02% cobalt, containing in total 948,000 tonnes nickel metal equivalent. Of this, about half is now in the indicated category and half in the inferred. Because the deposits are at the surface, mining will be straightforward and strip ratios very low. The Ni equivalent grade (NiEq) is calculated using the following formula:

NiEq = Ni + [ Co * (RCo/RNi) * (PCo/PNi) ] = Ni + (Co * 1.32)

using metal prices (P) of $10/pound Ni and $17/pound Co, and metal recovery factors (R) of 90% for Ni and 70% for Co, derived from metallurgical test work conducted by African Eagle.

The Company believes that the resources can be increased by another 8Mt to 10Mt with further drilling. There is also future upside at Zanzui, 50km to the south, where the Company is evaluating another significant nickel laterite resource, and at Nyawa, 15km west of Dutwa.

Metallurgical tests have shown that the nickel ores are unusually easy to process, giving good recoveries from heap or tank leaching at atmospheric pressure, with no need for costly high pressure acid leach (HPAL).

African Eagle currently holds a 90% interest in the eastern Wamangola deposit, which hosts approximately 60% of the total Dutwa resource, with an option to acquire 100%. The smaller western Ngasamo deposit is subject to a joint venture between African Eagle and the SAFINA Group of the Czech Republic under which African Eagle is in the process of earning an interest of between 50% and 75% by conducting and funding evaluation work there.

On completion of the feasibility study covering both deposits, African Eagle's own interest in Wamangola, together with the two companies' respective joint venture interests in Ngasamo will be converted into equity in the mining company formed to develop and operate the combined project. African Eagle estimates that it will then hold about 76% of the equity.

 

About African Eagle

Since discovering a major nickel oxide deposit at Dutwa in Tanzania, African Eagle is in transition from an explorer into a nickel company. The Company completed a positive scoping study on the Dutwa deposit in July 2009 and is now working towards a feasibility study.

In addition to Dutwa, African Eagle is also evaluating a second promising nickel oxide at Zanzui, which is located 60 km from Dutwa. The Company holds a 49% interest in the Mkushi Copper Mines joint venture in Zambia, for which a draft feasibility study was completed in Q4 2008. It also holds a half million ounce gold resource at the Miyabi project in Tanzania, and a portfolio of gold and base metal exploration assets, including two projects in the Zambian Copperbelt.

 

 


VanEck Vectors Global Alternative Energy ETF

EN DÉVELOPPEMENT
CODE : AFE.L
ISIN : GB0003394813
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African Eagle est une société développant des projet miniers de nickel et d'or basée au Royaume-Uni.

African Eagle est en développement de projets de nickel, d'or et de cuivre en Tanzanie et en Zambie.

Ses principaux projets en développement sont FAIDA - MIYABI PROJECT et KILIMANI - MIYABI PROJECT en Tanzanie et MKUSHI PROJECT en Zambie et ses principaux projets en exploration sont MAJELE, SENA et KING SOLOMON au Mozambique, NDOLA, SASARE EAGLE EYE, MOKAMBO, LUNGA et MKUSHI en Zambie et ZANZUI, IGURUBI, DUTWA et MIYABI en Tanzanie.

African Eagle est cotée au Royaume-Uni et en Allemagne. Sa capitalisation boursière aujourd'hui est 13,3 millions (22,3 millions US$, 16,7 millions €).

La valeur de son action a atteint son plus haut niveau récent le 08 juillet 2011 à 9,98 , et son plus bas niveau récent le 05 juillet 2013 à 0,10 .

African Eagle possède 47 442 200 actions en circulation.

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Nominations de VanEck Vectors Global Alternative Energy ETF
15/09/2011(UK) - Appointment of new CEO
05/05/2011(UK) - Appointment of Non-executive Director
09/03/2010(Dutwa)Appoints project manager at Dutwa
15/10/2009Appointment of New Chairman
Projets de VanEck Vectors Global Alternative Energy ETF
20/09/2011(Miyabi)(UK) - Miyabi drilling update
14/03/2011(Dutwa) Dutwa economic model update
01/03/2011(Dutwa)- Dutwa whittle optimisation report.
10/06/2010(Dutwa) Dutwa Nickel Project - Drilling Results
07/04/2010(Igurubi)Vends interest in Igurubi gold project to Peak Resources
17/03/2010(Dutwa)Drilling results from Ngasamo Hill
21/01/2010(Dutwa)Continues to Yield Positive Results
30/11/2009(Dutwa)Further Drilling Results
01/12/2009(Dutwa)Update on Metallurgical Tests
22/02/2010(Dutwa)Drill Results from Ngasamo Hill
20/10/2009(Dutwa)Dutwa Progress Summary
03/08/2009(Zanzui)Zanzui Nickel Leach Tests
29/07/2009(Dutwa)Dutwa Nickel Project Scoping Study
14/02/2009(Dutwa)Nickel Leach testwork results.
26/11/2008(Zanzui)Zanzui Nickel Project First Drill results
02/12/2008(Mokambo)Mokambo Copper Project
27/11/2008(Dutwa)Dutwa (7) The Resource statement
11/11/2008(Dutwa)DRILL RESULTS RECEIVED
26/08/2008(Dutwa)Dutwa Nickel Discovery
31/07/2008(Miyabi)Miyabi Project update
Communiqués de Presse de VanEck Vectors Global Alternative Energy ETF
26/09/2011(UK) - Investor Presentation, Press & Research Links & Updat...
04/08/2011(Dutwa)(UK) - Dutwa mineralogical results
27/06/2011(UK) - 'Riches beyond gold' - The Sunday Telegraph
21/06/2011(UK) - Mid-year progress report
21/04/2011(UK) - Preliminary results
20/05/2010Communication with Shareholders & Notice of AGM
30/04/2010PRELIMINARY RESULTS FOR THE YEAR ENDED 31 DECEMBER 2009
25/09/2009Interim Report & Accounts
07/08/2009Open Offer Financing Oversubscribed
21/07/2009Open Offer to Shareholders
14/05/2009Igurubi Gold Resource and Dutwa Nickel Project Report
09/01/2009Strategic plan
25/09/2008Interim results
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