Page 28 - Sundance Resources 2014 Annual Report

26 SUNDANCE RESOURCES LIMITED ANNUAL REPORT 2014
COMPETENT PERSONS STATEMENT
The information in this report that relates to Exploration Results and
Mineral Resources is based on information compiled by Mr Robin
Longley, a Member of the Australian Institute of Geoscientists, and
Mr Lynn Widenbar, a member of the Australasian Institute of Mining
and Metallurgy. Mr Longley and Mr Widenbar are consultants to
Sundance and have sufficient experience which is relevant to the style
of mineralisation and type of Deposit and to the activity which they are
undertaking to qualify as a Competent Person as defined in the 2004
Edition of the “Australasian Code for Reporting of Exploration Results,
Mineral Resources and Ore Reserves”.
The information in this report that relates to Ore Reserves is based
on information compiled by Mr Bruce Gregory, a member of the
Australasian Institute of Mining and Metallurgy. Mr Gregory is employed
by AMC Consultants Pty Ltd and is a consultant to the Company.
Mr Gregory has sufficient experience which is relevant to the style
of mineralisation and type of Deposit and to the activity which he is
undertaking to qualify as a Competent Person as defined in the 2004
Edition of the “Australasian Code for Reporting of Exploration Results,
Mineral Resources and Ore Reserves”.
Messrs Longley, Widenbar and Gregory consent to the inclusion in this
report of the matters based on their information in the form and context in
which it appears.
For more information including modelling parameters and details,
the ASX announcements pertaining to Exploration Results, Mineral
Resources and Ore Reserves are available from the Company’s website:
www.sundanceresources.com.au.
Itabirite Resources reported at the Mbarga Deposit (Republic of Cameroon)
and at the Nabeba Deposit (Republic of Congo)
At Mbarga, the estimated quantity and grade of Itabirite-style
mineralisation has been restricted to the area currently covered by drilling
on a 100m x 50m pattern for the Indicated Resource and a 200m x
100m spaced drill pattern applies for the Inferred Resource. This is
represented by an area approximately 3km (east-west) x 3km (north-
south) on the Mbarga Deposit.
At Nabeba, drilling of the Itabirite has been conducted on an approximate
400m x 200m spaced pattern and as such is only categorised at
Inferred. Recent drilling of the Itabirite at Nabeba has been by way or
re-entering and extending historical holes. However, all deep holes
across the Deposit area that intersected Itabirite have been used in the
estimation and this covers an area approximately 3km (east-west) x 3km
(north-south).
Grade has been estimated by Ordinary Kriging on composited sample
results. A digital terrain surface (based on highly accurate topographic
data), has been used to limit extrapolation of the mineralisation to the
topography of the relevant deposits. A number of mineralisation and
waste domains have been modelled as either a digital terrain surface or
as wireframes and used to constrain the grade interpolation. The Itabirite
resource modelling has used 20m (X) x 10m (Y) x 10m (Z) blocks at the
Mbarga Deposit with sub-blocks to honour the constraining surfaces.
Nabeba Itabirite modelling has applied 25m (X) x 25m (Y) x 5m (Z) blocks
at this Inferred stage of estimation.
Drillhole collar survey has utilised DGPS surveying at all Deposits.
Down-hole surveys (at Mbarga only) were determined using either
deviation or gyro survey data. Down-hole geophysical logging including
density, gamma, resistivity and caliper logs has been used in the
evaluation at Mbarga only. The Itabirite mineralisation has a very strong
correlation of density to Fe grade and therefore a Fe regression formula
has been applied to apply a density value. The regression formula has
been derived by analysis of data from geophysical downhole logging
and assaying, with a range of densities adopted from 3 to 4t/m3
depending on the iron grade.
Core and sample recovery has been recorded during logging. All drill hole
data is stored in an acQuire database and imported data is fully validated.
Assaying QA/QC was undertaken using field duplicates, laboratory
replicates and standards with comprehensive reporting on laboratory
precision and accuracy. Metallurgical test work programs have supported
the assay grades and density values of the major mineral types.
High Grade Hematite Resources reported on Exploration Permit 92,
Republic of Cameroon (Mbarga, Mbarga South and Metzimevin Deposits)
The estimated quantity and grade of High Grade Hematite quality
Supergene mineralisation and underlying Itabirite-style mineralisation
has been restricted to the area currently covered by drilling on a 100m
x 50m pattern for the Indicated Resource at Mbarga Deposit and a
spacing varying from 200m x 100m to 50m x 50m for the Indicated
Resource at the Mbarga South Deposit. A 200m x 100m drill pattern
applies for the Inferred Resource at the Mbarga and Metzimevin
Deposits. This is represented by an area approximately 3km (east-west)
x 3km (north-south) on the Mbarga Deposit; by an area approximately
1.5km (east-west) and 1.0km (north-south) on the Mbarga South
Deposit and 1.2km (east-west) x 0.3km (north-south) on the Metzimevin
Deposit. Grade has been estimated by Ordinary Kriging on composited
sample results.
Note that Cut-off grades for High Grade Hematite at the Mbarga
Deposits have been changed since the previous estimation (September,
2011) and while most restrictions have been removed, the following
still apply: ‘Phosphorus’ Domain: >50% Fe and <0.3% P; ‘Hypogene’
Domains: >51% Fe. Metzimevin Inferred Resources remain unchanged
and have a >50% Fe cut-off and density of 2.80 applied.
A digital terrain surface (based on highly accurate topographic data), has
been used to limit extrapolation of the mineralisation to the topography
of the relevant deposits. A number of mineralisation and waste domains
have been modelled as either a digital terrain surface or as wireframes
and used to constrain the grade interpolation. The resource modelling
has used a block size of 10m (X) by 10m (Y) by 2m (Z).
Drillhole collar survey has utilised DGPS surveying at all Deposits.
Down-hole surveys were determined using either deviation or gyro
survey data. Down-hole geophysical logging including density, gamma,
resistivity and caliper logs has been used in the evaluation.
Densities have been assigned from a combination of down hole
geophysical and physical measurements of diamond core carried
out as part of metallurgical analysis. Densities of 2.40 t/m3 have been
assigned for the Surficial Zone, 2.80 t/m3 for the Supergene, 2.80 t/m3
for the Phosphorus, 2.90 t/m 3 for the Transition and 3.20 t/m3 for the
Hypogene. The Itabirite mineralisation has a very strong correlation of
density to Fe grade and therefore a Fe regression formula has been
applied. The regression formula has been derived by analysis of data
from geophysical downhole logging and assaying, with a range of
densities adopted from 3 to 4 t/m3 depending on the iron grade.
Core and sample recovery has been recorded during logging. All drill hole
data is stored in an acQuire database and imported data is fully validated.