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.