Isua is located 150km Northeast of
Nuuk and 100km from a proposed deep seawater port. Isua will produce a premium
quality 70% Fe pellet feed concentrate with low impurities and benefits from
its position in the warmer south-west corner of Greenland which allows for year
round shipping.
In February 2011 London Mining
released the results of a scoping study compiled by SNC Lavalin International
Inc. (“SLII”), for the Isua iron ore project in Greenland. The scoping study
considered a 15 year life mine with 15Mtpa open pit, processing plant, pipeline
and a deep water port.
A bankable feasibility study (“BFS”)
with AACE Class 3 estimates for a 15Mtpa operation considering a 10 year mine
life based on the currently available amount of Indicated resources was
completed in March 2012. A 15 year scenario was also evaluated to demonstrate
the greater potential of the asset. The BFS supports the initial findings of
the scoping study, provides a more accurate estimate of cost and provides the
foundation to finance and construct a mine at Isua. The detailed results of the
BFS for the next stage of the project are outlined below.
Highlights of the Bankable
Feasibility Study
Study date
|
Scoping Study February 2011
|
BFS March 2012
|
Annual production (Mtpa)
|
15
|
15
|
Mine life (years)
|
15
|
10 with possible extension to 15
|
Operating cost (USD/t
concentrate)
|
30
|
46
|
Capital expenditure (USD billions)
|
2.05
|
2.35
|
Capital Intensity (USD/tpa)
|
136
|
157
|
Resources and mine life
As part of the BFS programme, 7,656m
of drilling was completed during the summer of 2011 which forms the basis for
an updated resource statement. Snowden now estimate a total resource for Isua
of 1,107Mt grading 32.3% Fe. This improved result has increased the resource by
10% in resource tonnage from the March 2011 resource statement. The modest
reduction in Fe grade to 32.6% is the result of the decision to report
internally diluted head grades due to incorporation of waste bearing structures
in the block model rather than consideration of a selective mining method.
The new resource represents a
substantial 82% increase in Indicated resources from 209Mt to 380Mt which is
sufficient to support a 10 year mine life. Potential to extend the mine life
could be achieved though further drilling necessary to convert Inferred
resources into the Indicated category.
Summary of Isua Mineral Resource at
March 2012 reported at a 20% Fe cut-off grade and constrained inside an
ultimate pit shell.
Category
|
Tonnes (Mt)
|
Fe (%)
|
Al2O3 (%)
|
SiO2 (%)
|
S (%)
|
P (%)
|
Indicated
|
380
|
32.6
|
2.4
|
41.8
|
0.23
|
0.03
|
Inferred (1)
|
727
|
32.1
|
2.3
|
42.3
|
0.22
|
0.03
|
Total
|
1,107
|
32.3
|
2.4
|
42.2
|
0.22
|
0.03
|
(1) 83% or 607Mt of the inferred
resources are extrapolated beyond the current drilling coverage.
The 2011 drilling campaign also
confirmed additional mineral resource potential originally indentified by Rio
Tinto in 1997. This area of mineralisation potential has been identified as a
down dip extrapolation of the Isua banded iron formation (“BIF”) bearing the
existing resource. Part of this mineralisation potential is comprised of an
area of hematite BIF which has been interpreted at the top of the BIF unit.
This appears to be underlain by more typical magnetite BIF.
Summary of the mineralisation
potential at the Isua deposit at end December 2011.
Potential mineralisation type
|
Potential tonnage range (Mt)
|
Potential Grade Range (Fe%)
|
Magnetite BIF
|
800 to 1200
|
30-33
|
Hematite BIF
|
150 to 300
|
>35
|
(2) Snowden considers this
material to be an indication of Mineralisation Potential only and makes no
guarantees that this material can or will be converted to a Mineral Resource or
an Ore Reserve at any time in the future following the collection of additional
data.
Flooding can come from various sources, from coastal waters, from rivers (also known as fluvial flooding) and surface water flooding. Of all these sources London is most vulnerable to surface water flooding. Heavy rainfall can swiftly overwhelm the drainage network, leading to flooding of low-lying areas.