REG - Resolute Mining Ltd - Updated Mineral Resource Estimate at Doropo
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RNS Number : 3803Y Resolute Mining Limited 08 September 2025
8 September 2025
Updated Mineral Resource Estimate at Doropo, Côte d'Ivoire
Resolute Mining Limited ("Resolute" or "the Company") (ASX/LSE: RSG), the
Africa-focused gold miner, is pleased to announce an updated Mineral Resource
Estimate ("MRE") for the Doropo Gold Project which is situated in Northern
Côte d'Ivoire.
Highlights
• Total Measured, Indicated and Inferred MRE of 114 Mt grading 1.19
g/t Au for 4.4 Moz a 28% increase from the previous MRE of 3.4 Moz
• Most of the Mineral Resources are within 150m of surface and the
larger deposits (Kilosegui and Souwa) remain open along strike and at depth
• 84% of the Mineral Resources are in the Measured and Indicated
category
All dollar values are in United States Dollars unless specified otherwise
Since acquiring Doropo in Q2 2025, Resolute has been updating the existing
Definitive Feasibility Study ("DFS") that was produced by Centamin in July
2024. As part of the update optimisations of the Resource have been completed
at a gold price assumption of $3000/oz versus $2,000/oz in the previous 2023
MRE. The Updated Mineral Resource Estimate of 4.4 Moz represents a substantial
c. 1 Moz increase from the previous MRE of 3.4 Moz with 84% of contained
ounces in the Measured and Indicated resource category.
The Company is confident of further growth of the Mineral Resources as current
optimisations are based on conservative pit shell assumptions and the two
largest prospects, Kilosegui and Souwa that contain approximately 2.3Moz of
the MRE, remain open along strike and at depth.
Resolute anticipates that, based on the plant capacity outlined in the 2024
DFS, the increase in Mineral Resources will extend the mine life by at least
five years beyond the original 10-year plan. The conversion of Measured and
Indicated Resources to Reserves was approximately 61% in the 2024 DFS.
Resolute is in the process of optimising pit designs and incorporating revised
capital and operating cost estimates to update the Ore Reserves of Doropo.
This is being done at a gold price assumption of $1,950/oz (versus $1,450/oz
in the 2024 DFS). The updated DFS is expected to maintain a production
profile, similar to the 2024 DFS, of more than 200koz per year in the first
four years of production.
All workstreams for Doropo are on track. The updated DFS, being run by
Lycopodium, is targeted for Q4 2025 along with an updated Ore Reserve.
Resolute is awaiting approval of the Exploitation Permit by the
Interministerial Commission followed by signing of the Presidential Decree.
Following this, FID is expected by end of 2025.
Chris Eger, Managing Director and CEO commented:
"This increase in the size of the Mineral Resource at Doropo is a promising
first step and one we expected given the change in the gold environment since
Centamin's DFS published in July 2024. We are confident that Doropo will be a
high-quality long-life mine underpinned by the expectation of further resource
growth at Kilosegui and Souwa.
The major increase over the existing Resource indicates major upside at Doropo
and is a key consideration in the updated DFS. We are continuing the
optimisation studies and expect to provide the updated DFS and Ore Reserve by
the end of the year."
Doropo
Resolute announced the acquisition of the Doropo Gold Project on 1 May 2025.
Doropo is a development-stage project that is expected to increase Group
production above 500koz per year once in production from 2028. The project is
expected to grow and diversify Resolute's operations in the broader West
African region.
In the 2024 DFS a gold price assumption of $2,000/oz for the pit constrained
RPEEE Mineral Resources and $1,450/oz for the Ore Reserves was used. Resolute
is currently carrying out a number of workstreams to update the 2024 DFS which
will reflect the higher gold price and revised input costs.
Resolute has recently rerun new pit optimisations on all the Doropo Mineral
Resource Block Models for pit optimisation using a range of gold prices. The
Mineral Resource for Doropo is reported within a $3,000/oz pit shell and above
a cut-off of 0.3g/t (see Table 1).
Doropo Mineral Resource Estimate
September 2025 October 2023
(0.3g/t Au cut-off, $3,000/oz pit shell, JORC 2012) (0.3g/t Au cut-off, $2,000/oz pit shell, CIM 2014)
Classification Tonnes Grade (g/t Au) Ounces (Au) Tonnes Grade (g/t Au) Ounces (Au)
Measured 1,550,000 1.57 78,000 1,510,000 1.60 77,000
Indicated 95,200,000 1.18 3,601,000 75,340,000 1.25 3,027,000
Inferred 17,440,000 1.21 680,000 7,370,000 1.23 292,000
Total 114,190,000 1.19 4,360,000 84,220,000 1.25 3,396,000
Table 1: Doropo Mineral Resource Estimate Comparison
Within the $3,000/oz pit shell 84% of the Mineral Resources are in the
Measured and Indicated category.
There remains significant potential to grow and expand the Mineral Resources
at Doropo. The larger resources such as those at Souwa and Kilosegui are
open down dip and along strike.
Geology and Mineralisation
The Doropo Project is located within the Birimian-age greenstone belts of the
West African Craton, a prolific geological setting known for hosting orogenic
gold deposits. Specifically, the project lies in northern Côte d'Ivoire,
comprising a sequence of volcano-sedimentary rocks, including mafic volcanics,
interbedded metasediments, felsic intrusives, and minor ultramafic units. The
local geology consists predominantly of intermediate to mafic volcaniclastic
rocks, intruded by granitoid bodies and crosscut by regional shear zones
Gold mineralisation is primarily structurally controlled, hosted within
moderate- to steeply-dipping quartz-carbonate-sulphide vein arrays. These
veins are developed along shear zones, fault splays, and lithological
contacts. Mineralisation is associated with strong silica, sericite,
carbonate, and minor chlorite alteration halos. Sulphide minerals such as
pyrite, arsenopyrite, and lesser amounts of pyrrhotite are common, closely
associated with gold occurrence. The mineralisation style is typical of
orogenic lode gold systems, with gold generally occurring as free grains and
fine inclusions within sulphides. Structural controls, including vein
orientations and competency contrasts between rock units, are critical factors
influencing the distribution and continuity of mineralisation.
Doropo Mineral Resource Notes
Mineral Resources stated in this announcement used identical input parameters
used by Centamin in the 2024 Doropo DFS but were constrained by $3,000/oz pit
shells rather than $2,000/oz pit shells. The smaller Mineral Resources which
were not included in the 2024 Ore Reserves were constrained by $2,000/oz
shells (see notes on Tables 2 - 4). Further optimisations are in progress
and will be published in the upcoming 2025 Mineral Resources and Ore Reserve
Statement.
Mineral Resource Estimates by classification and prospect are shown in Table
2, 3 and 4.
Measured Mineral Resources (0.3 g/t Au COG)
Prospect Mt Au g/t Au Moz
Attire(1) - - -
Chegue Main(2) 0.19 1.09 0.007
Chegue South(2) 0.23 1.08 0.008
Enioda(2) - - -
Han(2) 0.11 2.03 0.007
Hinda(1) - - -
Hinda South(1) - - -
Kekeda(2) 0.20 0.81 0.005
Kilosegui(2) 0.21 1.10 0.007
Nare(1) - - -
Nokpa(2) 0.34 2.48 0.027
Sanboyoro(1) - - -
Solo(1) - - -
Souwa(2) 0.27 1.88 0.016
Tchouahinin(1) - - -
Vako(1) - - -
TOTAL 1.55 1.57 0.078
Table 2: Measured Mineral Resources by Prospect
Indicated Mineral Resources (0.3 g/t Au COG)
Prospect Mt Au g/t Au Moz
Attire(1) 0.42 1.86 0.025
Chegue Main(2) 7.80 0.98 0.246
Chegue South(2) 6.26 1.02 0.206
Enioda(2) 3.95 1.24 0.158
Han(2) 5.16 1.66 0.276
Hinda(1) - - -
Hinda South(1) - - -
Kekeda(2) 5.72 0.95 0.175
Kilosegui(2) 35.78 1.08 1.247
Nare(1) - - -
Nokpa(2) 7.38 1.50 0.356
Sanboyoro(1) 0.01 1.33 0.001
Solo(1) - - -
Souwa(2) 20.23 1.31 0.853
Tchouahinin(1) - - -
Vako(1) 2.48 0.73 0.058
TOTAL 95.20 1.18 3.601
Table 3: Indicated Mineral Resources by Prospect
Inferred Mineral Resources (0.3 g/t Au COG)
Prospect Mt Au g/t Au Moz
Attire(1) 0.71 2.43 0.055
Chegue Main(2) 1.30 0.97 0.041
Chegue South(2) 1.15 1.07 0.040
Enioda(2) 1.49 1.08 0.052
Han(2) 0.57 1.30 0.024
Hinda(1) 0.15 1.54 0.007
Hinda South(1) 0.84 0.78 0.021
Kekeda(2) 0.61 0.68 0.013
Kilosegui(2) 4.25 0.99 0.135
Nare(1) 0.05 0.95 0.002
Nokpa(2) 3.84 1.41 0.173
Sanboyoro(1) 0.11 1.61 0.006
Solo(1) 0.16 2.43 0.013
Souwa(2) 1.03 1.89 0.063
Tchouahinin(1) 1.06 0.96 0.033
Vako(1) 0.12 0.71 0.003
TOTAL 17.44 1.21 0.680
Table 4: Inferred Mineral Resources by Prospect
Some numerical differences may occur due to rounding;
● 1 - RPEEE is defined by optimised pit shells based on a gold price
of $2,000/oz;
● 2 - RPEEE is defined by optimised pit shells based on a gold price
of $3,000/oz;
● Reported at a gold grade cut-off of 0.3 g/t Au;
● Includes drill holes up to and including 27 August 2023;
● Inclusive of Mineral Reserves
Contact
Resolute Public Relations
Matthias O'Toole-Howes Jos Simson, Tavistock
motoolehowes@resolutemining.com resolute@tavistock.co.uk (mailto:resolute@tavistock.co.uk)
+44 207 920 3150
Corporate Brokers
Jennifer Lee, Berenberg
+44 20 3753 3040
Tom Rider, BMO Capital Markets
+44 20 7236 1010
Authorised by Mr Chris Eger, Managing Director and Chief Executive Officer
About Resolute Mining
Resolute is an African-focused gold miner with more than 30 years of
experience as an explorer, developer and operator. Throughout its history the
Company has produced more than 9 million ounces of gold from ten gold mines.
The Company is now entering a growth phase through the development of the
Doropo project in Côte d'Ivoire which will supplement the existing
production from the Syama mine in Mali and Mako mine in Senegal. The Company
trades on the Australian Securities Exchange (ASX) and the London Stock
Exchange (LSE) under the ticker RSG.
Competent Persons Statement
The information in this report that relates to the Exploration Results,
Mineral Resources and Ore Reserves is based on information compiled by Mr
Bruce Mowat, a member of The Australian Institute of Geoscientists. Mr Bruce
Mowat has more than 5 years' experience relevant to the styles of
mineralisation and type of deposit under consideration and to the activity
which he is undertaking to qualify as a Competent Person, as defined in the
2012 Edition of the "Australasian Code for Reporting of Exploration Results,
Mineral Resources and Ore Reserves" (the JORC Code). Mr Bruce Mowat is a
full-time employee of the Resolute Mining Limited Group and holds equity
securities in the Company. He has consented to the inclusion of the matters in
this report based on his information in the form and context in which it
appears. This information was prepared and disclosed under the JORC Code 2012
except where otherwise noted.
The information in this announcement that relates to the Mineral Resource
estimate has been based on information and supporting documents prepared by Mr
Bruce Mowat, a Competent Person who is a member of The Australian Institute of
Geoscientists. Mr Mowat is a full-time employee Resolute Mining Limited Group
and has sufficient experience relevant to the style of mineralisation and type
of deposit under consideration and to the activity which has been undertaken
to qualify as a Competent Person. Mr Mowat confirms that the Mineral Resource
estimate is based on information in the supporting documents and consents to
the inclusion in the report of the Mineral Resource estimate and related
content based on the information in the form and context in which it appears.
Cautionary Statement about Forward-Looking Statements
This announcement contains certain "forward-looking statements" including
statements regarding our intent, belief or current expectations with respect
to Resolute's business and operations, market conditions, results of
operations and financial condition, and risk management practices. The words
"likely", "expect", "aim", "should", "could", "may", "anticipate", "predict",
"believe", "plan", "forecast" and other similar expressions are intended to
identify forward-looking statements. Indications of, and guidance on, future
earnings, anticipated production, life of mine and financial position and
performance are also forward-looking statements. These forward-looking
statements involve known and unknown risks, uncertainties and other factors
that may cause Resolute's actual results, performance and achievements or
industry results to differ materially from any future results, performance or
achievements, or industry results, expressed or implied by these
forward-looking statements. Relevant factors may include (but are not limited
to) changes in commodity prices, foreign exchange fluctuations and general
economic conditions, increased costs and demand for production inputs, the
speculative nature of exploration and project development, including the risks
of obtaining necessary licences and permits and diminishing quantities or
grades of reserves, political and social risks, changes to the regulatory
framework within which Resolute operates or may in the future operate,
environmental conditions including extreme weather conditions, recruitment and
retention of personnel, industrial relations issues and litigation.
Forward-looking statements are based on Resolute's good faith assumptions as
to the financial, market, regulatory and other relevant environments that will
exist and affect Resolute's business and operations in the future. Resolute
does not give any assurance that the assumptions will prove to be correct.
There may be other factors that could cause actual results or events not to be
as anticipated, and many events are beyond the reasonable control of Resolute.
Readers are cautioned not to place undue reliance on forward-looking
statements, particularly in the current economic. Forward-looking statements
in this document speak only at the date of issue. Except as required by
applicable laws or regulations, Resolute does not undertake any obligation to
publicly update or revise any of the forward-looking statements or to advise
of any change in assumptions on which any such statement is based. Except for
statutory liability which cannot be excluded, each of Resolute, its officers,
employees and advisors expressly disclaim any responsibility for the accuracy
or completeness of the material contained in these forward-looking statements
and excludes all liability whatsoever (including in negligence) for any loss
or damage which may be suffered by any person as a consequence of any
information in forward-looking statements or any error or omission.
Annexure 1 - JORC Code, 2012 Edition
Additional technical information relating to foreign estimates
ASX Listing Rule 5.12
Section 1 Sampling Techniques and Data
Doropo Project -
(Criteria in this section apply to all succeeding sections.)
Criteria JORC Code explanation Commentary
Sampling techniques ● Nature and quality of sampling (eg cut channels, random chips, or ● The sampling was conducted using multiple techniques tailored to the
specific specialised industry standard measurement tools appropriate to the project's geological and surface conditions. Soil sampling programs were
minerals under investigation, such as down hole gamma sondes, or handheld XRF extensive, collecting approximately 92,307 samples between 2014 and 2022.
instruments, etc). These examples should not be taken as limiting the broad Soils were sampled from the mottled zone or the top of the saprolite horizon
meaning of sampling. to obtain coherent gold anomalies, utilising standardised grid patterns
(typically 400 m x 400 m, with infill at 200 m and 100 m where required).
● Include reference to measures taken to ensure sample representivity Auger drilling was employed in areas with thick lateritic cover (>3 m),
and the appropriate calibration of any measurement tools or systems used. reaching saprolitic material with depths averaging 6.22 m and up to 30 m in
some cases. Auger drilling recovered material systematically for gold analysis
● Aspects of the determination of mineralisation that are Material to and geochemical interpretation.
the Public Report.
● Trenching programs (32 trenches to date) were used to expose in situ
● In cases where 'industry standard' work has been done this would be mineralised structures, allowing for systematic channel sampling.
relatively simple (eg 'reverse circulation drilling was used to obtain 1 m
samples from which 3 kg was pulverised to produce a 30 g charge for fire ● Reverse Circulation (RC) and Diamond Core (DD) drilling were the
assay'). In other cases more explanation may be required, such as where there principal methods used for delineating Mineral Resources. RC drilling was
is coarse gold that has inherent sampling problems. Unusual commodities or conducted using 5¼ to 5¾ inch diameter face-sampling hammers to recover
mineralisation types (eg submarine nodules) may warrant disclosure of detailed one-metre interval samples, typically dry unless groundwater was encountered.
information. Diamond drilling employed HQ and NQ diameter core, with triple tube techniques
for improving recovery in broken ground. RC samples were riffle split on site,
and core samples were sawn to produce half-core for analysis. Sampling
procedures incorporated QAQC measures, including the insertion of blanks,
standards, and duplicates to ensure sample representivity. Assay protocols
utilised 50 g fire assay (AAS finish) for gold, and multi-element analysis was
performed where applicable.
Drilling techniques ● Drill type (eg core, reverse circulation, open-hole hammer, rotary ● Drilling methods involved a combination of Reverse Circulation (RC),
air blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or Diamond Core (DD), and auger drilling methods. RC drilling was primarily used
standard tube, depth of diamond tails, face-sampling bit or other type, for delineating near-surface mineralisation and preliminary resource
whether core is oriented and if so, by what method, etc). definition. RC drilling employed face-sampling hammers with bit sizes ranging
from 5¼ to 5¾ inches. Dry drilling was the standard procedure, with drilling
halted at the water table to prevent contamination from wet samples; below
groundwater, diamond drilling methods were applied.
● Diamond core drilling used HQ and NQ diameter core. Triple-tube
systems were implemented in highly broken ground to maximise core recovery,
while standard double-tube setups were used elsewhere. Orientation of diamond
core was conducted selectively using Reflex ACT II core orientation devices to
facilitate structural logging. Auger drilling was utilised for shallow
exploration across areas with thick laterite cover. All drill methods were
executed to a high standard with contractors experienced in gold exploration
in West Africa.
Drill sample recovery ● Method of recording and assessing core and chip sample recoveries ● Drill sample recovery was systematically monitored during both RC
and results assessed. and diamond drilling programs. RC samples were weighed regularly, particularly
from 2018 onwards, to monitor sample size consistency and ensure the
● Measures taken to maximise sample recovery and ensure representative representativeness of samples. Analysis of over 447,401 RC sample weights
nature of the samples. showed a consistent recovery trend stabilizing between 30-40 kg per metre
after clearing the uppermost weathered horizons. Minor variations in sample
● Whether a relationship exists between sample recovery and grade and weight were observed at shallow depths and in softer materials; however,
whether sample bias may have occurred due to preferential loss/gain of statistical checks confirmed no significant bias in gold grade associated with
fine/coarse material. sample mass.
● Diamond core recovery was measured, with an overall average recovery
of approximately 96% across the project. Recovery rates improved with depth,
with >90% core recovery recorded for 89.5% of core samples, and exceeding
97.5% recovery below 50 m depth. Core recovery measurements were recorded in
the database for each run. The use of triple-tube drilling in broken ground
contributed to maintaining high recovery standards. The overall conclusion,
supported by quality control reviews, was that there is no significant
sampling bias attributable to differential recovery.
Logging ● Whether core and chip samples have been geologically and ● Comprehensive geological and geotechnical logging was undertaken for
geotechnically logged to a level of detail to support appropriate Mineral all drillholes including RC and DD. Drillholes were logged systematically for
Resource estimation, mining studies and metallurgical studies. a range of key geological attributes: lithology, alteration, mineralisation,
texture, structure, weathering, and rock quality designation (RQD). RC samples
● Whether logging is qualitative or quantitative in nature. Core (or were logged visually on site, with geological observations recorded both
costean, channel, etc) photography. digitally and on physical log sheets where applicable. Diamond core was logged
in greater detail, particularly for structural geology, alteration styles,
● The total length and percentage of the relevant intersections mineral assemblages, and vein relationships, providing critical inputs for 3D
logged. geological modelling.
● Photographic records were maintained for all diamond drill core -
photographed both wet and dry - before sampling. Logging captured sufficient
detail to support resource estimation, mining studies, and metallurgical
investigations. Logging procedures included the use of a standardised
lithological and alteration coding scheme to ensure consistency across the
drilling campaigns. Digital capture of logging data into a centralised
database with validation rules also enhanced data reliability.
Sub-sampling techniques and sample preparation ● If core, whether cut or sawn and whether quarter, half or all core ● Systematic sub-sampling and sample preparation protocols were
taken. employed to ensure that samples remained representative of in situ
mineralisation. For RC drilling, 1 m samples were split on site using a
● If non-core, whether riffled, tube sampled, rotary split, etc and three-tier riffle splitter to achieve a target sample size of approximately 2
whether sampled wet or dry. to 3 kg for laboratory submission. Wet samples encountered in shallow zones
were left to dry naturally prior to splitting where possible. For diamond
● For all sample types, the nature, quality and appropriateness of the drilling, core was cut lengthwise using diamond-bladed core saws; half-core
sample preparation technique. samples were collected for routine assay, while the other half was preserved
for reference and potential future re-assay.
● Quality control procedures adopted for all sub-sampling stages to
maximise representivity of samples. ● Sample preparation at the laboratory followed industry best
practices. Samples were oven dried, crushed to 70 to 85% passing 2 mm, then
● Measures taken to ensure that the sampling is representative of the riffle split to produce a subsample for pulverisation. The pulverised material
in situ material collected, including for instance results for field was milled to achieve at least 85% passing 75 microns, producing a pulp of
duplicate/second-half sampling. approximately 150 to 250 g for fire assay analysis. Quality assurance measures
were built into preparation workflows, including the regular inclusion of
● Whether sample sizes are appropriate to the grain size of the duplicate splits and check samples. Laboratory facilities used (primarily
material being sampled. Bureau Veritas Abidjan, SGS Ouagadougou) operated to ISO 17025 standards, and
internal laboratory QAQC reviews were conducted regularly.
Quality of assay data and laboratory tests ● The nature, quality and appropriateness of the assaying and ● Assay methodologies were based on internationally recognised
laboratory procedures used and whether the technique is considered partial or standards and utilised reputable laboratories. All drill samples were
total. primarily analysed for gold using 50 g fire assay with atomic absorption
spectroscopy (AAS) or inductively coupled plasma atomic emission spectroscopy
● For geophysical tools, spectrometers, handheld XRF instruments, etc, (ICP-AES) finish. In cases where assays exceeded 10 g/t Au, samples were
the parameters used in determining the analysis including instrument make and re-analysed using a gravimetric finish to improve accuracy. For some RC and
model, reading times, calibrations factors applied and their derivation, etc. trench samples, particularly those with coarse gold, photon assay techniques
were trialled to validate fire assay results.
● Nature of quality control procedures adopted (eg standards, blanks,
duplicates, external laboratory checks) and whether acceptable levels of ● Quality control procedures were rigorous. Certified reference
accuracy (ie lack of bias) and precision have been established. materials (standards), field blanks, and field duplicates were inserted into
the sample stream at regular intervals - approximately one QAQC sample every
20 to 30 samples. Laboratory duplicates, internal standards, and blanks were
also monitored. QAQC data were routinely reviewed to ensure analytical
accuracy and precision. Failures (e.g., a standard outside 3 standard
deviations) triggered immediate re-assay of sample batches. No significant
long-term bias or drift was observed across the assay dataset. Laboratories
involved (Bureau Veritas, Abidjan and SGS, Ouagadougou) are ISO/IEC 17025
accredited, ensuring laboratory practices are consistent with industry best
practice.
Verification of sampling and assaying ● The verification of significant intersections by either independent ● Verification of sampling and assaying was undertaken through a
or alternative company personnel. combination of internal reviews, duplicate analyses, and independent data
validation exercises. Field duplicates were collected regularly from RC
● The use of twinned holes. drilling to monitor sampling precision, with results demonstrating
satisfactory repeatability of gold grades. CRMs and blanks were inserted at
● Documentation of primary data, data entry procedures, data regular intervals to monitor assay accuracy and contamination. QAQC charts
verification, data storage (physical and electronic) protocols. were reviewed continuously by project geologists and external consultants
during key drilling campaigns.
● Discuss any adjustment to assay data.
● The primary assay laboratories (Bureau Veritas and SGS) conducted
their own internal QC programs, which were also monitored. Limited twin
drilling was conducted, with twin RC holes and DD holes used to verify
mineralisation continuity, grade reproducibility, and geological
interpretation; results confirmed good spatial reproducibility. While external
umpire (secondary lab) assay programs were not routinely undertaken, the
performance of primary laboratories and internal QAQC programs were considered
satisfactory for the reporting of Mineral Resources. Assay data and logging
data were entered digitally into validated databases, and independent audits
of the database have been performed during resource estimation reviews.
Location of data points ● Accuracy and quality of surveys used to locate drill holes (collar ● Drillhole collar locations were surveyed using a combination of
and down-hole surveys), trenches, mine workings and other locations used in differential GPS (DGPS) systems and total station surveying where higher
Mineral Resource estimation. precision was required. The DGPS surveys were conducted by trained field
surveyors to ensure location accuracy suitable for Mineral Resource
● Specification of the grid system used. estimation, with horizontal and vertical accuracy generally within ±0.2 m. In
areas of rugged topography or logistical difficulty, survey-grade handheld GPS
● Quality and adequacy of topographic control. units were temporarily used during initial exploration stages (soil sampling,
auger drilling, trenching), but were later replaced with DGPS surveys for all
critical drill collars.
● Elevation data were tied into the Nivellement Général de Côte
d'Ivoire (NGCI) vertical datum. A topographic digital terrain model (DTM) was
produced using high-resolution satellite imagery and ground-truthing, which
was used for both resource modelling and mine planning. Grid systems used were
WGS84, Zone 30N for initial exploration and UTM Zone 30N (WGS84 projection)
for final resource definition.
Data spacing and distribution ● Data spacing for reporting of Exploration Results. ● Drilling was conducted on nominal grid spacings appropriate for the
level of confidence required for resource estimation. In the main mineralised
● Whether the data spacing and distribution is sufficient to establish zones (Souwa, Chegue, and Krakara), RC and diamond drilling was performed on
the degree of geological and grade continuity appropriate for the Mineral approximately 25 m x 25 m to 50 m x 50 m grids. Some areas of denser drilling
Resource and Ore Reserve estimation procedure(s) and classifications applied. (for example, grade control drilling) achieved spacing as tight as 10 m x 10
m.
● Whether sample compositing has been applied.
● Outside the main resource areas, reconnaissance and exploration
drilling was more broadly spaced at 80 m x 80 m or larger intervals,
appropriate for early-stage resource targeting. Soil sampling grids were
generally established on 400 m x 400 m grids, with localised infill to 100 m
or 200 m grids as needed. Data spacing was assessed during Mineral Resource
estimation and was found sufficient to establish geological and grade
continuity for the appropriate classifications (Measured, Indicated, and
Inferred). No sample compositing was applied prior to resource estimation; raw
assay intervals were used directly in estimation procedures.
Orientation of data in relation to geological structure ● Whether the orientation of sampling achieves unbiased sampling of ● Drilling programs were designed to target mineralised structures as
possible structures and the extent to which this is known, considering the close to perpendicular as possible to the interpreted dip of mineralisation at
deposit type. each deposit. Most drillholes were oriented towards the southeast or southwest
with an inclination of -50° to -60°, depending on the local structural
● If the relationship between the drilling orientation and the orientation of gold-bearing zones. The mineralisation is generally hosted in
orientation of key mineralised structures is considered to have introduced a north-northeast trending structures dipping moderately to steeply to the east
sampling bias, this should be assessed and reported if material. or west, making these drill orientations appropriate to intersect mineralised
zones at reasonable angles and to minimise bias in the intercept lengths.
● Geological interpretations and cross sections confirm that drilling
achieved reasonably representative intersections of mineralisation. No
significant sampling bias related to drilling orientation was observed during
resource modelling and estimation. In areas of uncertainty or more complex
structure (fold closures, sheared zones), multiple drill directions were
employed to cross-validate mineralisation geometry.
Sample security ● The measures taken to ensure sample security. ● Sample security protocols were implemented to ensure the integrity
of all collected samples from the point of collection through to laboratory
delivery. After collection, samples were placed into pre-numbered, durable
plastic bags and securely sealed. Multiple samples were then packed into
larger polyweave sacks for easier handling and protection during transport.
Samples were stored in a secure, supervised facility at the exploration camp
before transportation.
● Transport to the assay laboratories (Bureau Veritas in Abidjan and
SGS in Ouagadougou) was carried out either by company personnel or trusted,
contracted couriers. Chain-of-custody forms were maintained throughout the
transfer process, and receipt of samples was acknowledged in writing by
laboratory staff. While rigorous internal controls were observed, there is no
specific mention of external audits or independent oversight of sample
security protocols. However, no incidents of sample loss, tampering, or
contamination have been reported, and laboratory reconciliation of received
samples consistently matched dispatch records.
Audits or reviews ● The results of any audits or reviews of sampling techniques and ● Audits and reviews of sampling techniques, assay data, and database
data. integrity have been carried out periodically. Internal technical reviews were
performed by Centamin's in-house geology and resource teams throughout the
exploration and resource evaluation phases. These reviews covered sampling
practices, QAQC data performance, logging standards, and database quality,
ensuring consistent application of protocols and identifying areas for
procedural improvement where necessary.
● Independent reviews of the Resource models and supporting
exploration data were conducted as part of the NI 43-101 technical report
preparation. Qualified Persons (QPs) signed off on the Mineral Resource
estimates after assessing the drilling, sampling, and QAQC procedures.
Section 2 Reporting of Exploration Results
(Criteria listed in the preceding section also apply to this section.)
Criteria JORC Code explanation Commentary
Mineral tenement and land tenure status ● Type, reference name/number, location and ownership including ● The Doropo Project is located in the northeast of Côte d'Ivoire, in
agreements or material issues with third parties such as joint ventures, the Bounkani region approximately 480 km north of Abidjan, near the border
partnerships, overriding royalties, native title interests, historical sites, with Burkina Faso. The project comprises a contiguous package of seven
wilderness or national park and environmental settings. exploration permits ("Doropo Permit Package") covering a combined area of
approximately 1,847 km².
● The security of the tenure held at the time of reporting along with
any known impediments to obtaining a licence to operate in the area. ● All tenements are held in good standing with the Côte d'Ivoire
Ministry of Mines and have been maintained in accordance with local legal
requirements. There are no known outstanding disputes affecting the licences.
Surface rights, compensation arrangements with local communities, and
environmental baseline studies have been addressed as part of the permitting
and development process. Royalties include a standard 4% government royalty on
gold production as prescribed under Ivorian mining law. No third-party
ownership interests, material encumbrances, or joint venture arrangements
affecting the Doropo Project have been disclosed.
Exploration done by other parties ● Acknowledgment and appraisal of exploration by other parties. ● Historical exploration activities prior to Centamin's involvement
were limited. There are no records of systematic exploration or drilling by
major international companies. Previous work primarily consisted of
regional-scale geochemical surveys and government-sponsored mapping programs
conducted by the Côte d'Ivoire geological survey and local government
initiatives. These activities provided basic geological context but did not
lead to significant discovery or development efforts.
● Centamin's exploration efforts since acquiring the permits have been
responsible for the identification, systematic testing, and advancement of the
Doropo Mineral Resource. No Mineral Resources or significant exploration
targets from previous explorers were inherited by Centamin. All resources
reported to date result from Centamin's soil sampling, auger drilling,
trenching, and drilling campaigns. As such, historical data has not materially
contributed to the current Mineral Resource Estimate.
Geology ● Deposit type, geological setting and style of mineralisation. ● The Doropo Project is located within the Birimian-age greenstone
belts of the West African Craton, a prolific geological setting known for
hosting orogenic gold deposits. Specifically, the project lies in northern
Côte d'Ivoire, comprising a sequence of volcano-sedimentary rocks, including
mafic volcanics, interbedded metasediments, felsic intrusives, and minor
ultramafic units. The local geology consists predominantly of intermediate to
mafic volcaniclastic rocks, intruded by granitoid bodies and crosscut by
regional shear zones.
● Gold mineralisation is primarily structurally controlled, hosted
within moderate- to steeply-dipping quartz-carbonate-sulphide vein arrays.
These veins are developed along shear zones, fault splays, and lithological
contacts. Mineralisation is associated with strong silica, sericite,
carbonate, and minor chlorite alteration halos. Sulphide minerals such as
pyrite, arsenopyrite, and lesser amounts of pyrrhotite are common, closely
associated with gold occurrence. The mineralisation style is typical of
orogenic lode gold systems, with gold generally occurring as free grains and
fine inclusions within sulphides. Structural controls, including vein
orientations and competency contrasts between rock units, are critical factors
influencing the distribution and continuity of mineralisation.
Drill hole Information ● A summary of all information material to the understanding of the ● The NI 43-101 Technical Report provides comprehensive drillhole
exploration results including a tabulation of the following information for information, covering collar locations, drill hole depths, azimuths, dips, and
all Material drill holes: key intersections. Drillhole collars were surveyed using differential GPS
(DGPS) or total station equipment, and were tied into a local grid based on
o easting and northing of the drill hole collar the UTM Zone 30N, WGS84 datum. Complete lists of drill collars, including
northing, easting, elevation, azimuth, dip, and total depth, are included in
o elevation or RL (Reduced Level - elevation above sea level in metres) of the appendices of the technical report for all holes used in Resource estimation.
drill hole collar
● Significant exploration results and Mineral Resource drill
o dip and azimuth of the hole intersections are reported systematically, with true thickness considerations
discussed where relevant. The database includes 5,794 drillholes for a total
o down hole length and interception depth of 547,805 m of drilling. The report also provides detailed composite
intercept tables for representative drilling results across all principal
o hole length. deposits (Souwa, Chegue, Krakara, etc.), including downhole depth intervals,
gold grades, and sample lengths.
● If the exclusion of this information is justified on the basis that
the information is not Material and this exclusion does not detract from the
understanding of the report, the Competent Person should clearly explain why
this is the case.
Data aggregation methods ● In reporting Exploration Results, weighting averaging techniques, ● Exploration results and Mineral Resource drill intercepts are
maximum and/or minimum grade truncations (eg cutting of high grades) and reported based on compositing of contiguous mineralised intervals. Assay
cut-off grades are usually Material and should be stated. results were composited to ensure that sample length variability did not
introduce bias. Only intervals above a certain cut-off grade (typically 0.5
● Where aggregate intercepts incorporate short lengths of high grade g/t Au for mineralised zones) were included when reporting exploration
results and longer lengths of low grade results, the procedure used for such results.
aggregation should be stated and some typical examples of such aggregations
should be shown in detail. ● No top-cutting (grade capping) was applied when presenting raw
exploration results; however, top-cutting was considered and applied during
● The assumptions used for any reporting of metal equivalent values Mineral Resource estimation to control the influence of extreme outlier
should be clearly stated. grades. Composites used downhole lengths of 1 m, reflecting the RC and DD
sampling intervals. Where lower grade material was present within higher-grade
zones, internal dilution up to 2 m was accepted within the composited interval
to maintain geological continuity.
Relationship between mineralisation widths and intercept lengths ● These relationships are particularly important in the reporting of ● The majority of drilling was designed to intersect mineralisation as
Exploration Results. close as possible to true width by orienting drillholes approximately
perpendicular to the dominant strike and dip of mineralised structures.
● If the geometry of the mineralisation with respect to the drill hole Drillholes were typically inclined at -50° to -60° angles depending on local
angle is known, its nature should be reported. geological conditions, and aimed at intersecting mineralised zones that dip
moderately (30°to 70°) towards the east or west (according to the individual
● If it is not known and only the down hole lengths are reported, deposit). As such, downhole intercept lengths reported in exploration results
there should be a clear statement to this effect (eg 'down hole length, true approximate true widths in most cases, particularly in the main Souwa, Chegue,
width not known'). and Krakara deposits.
● In cases where drilling was oblique to structures - particularly in
folded or complex structural zones, true widths were estimated or commentary
provided where necessary. No material bias in grade or continuity arising from
drilling orientation was identified during Mineral Resource estimation.
Geological modelling used structural measurements, cross sections, and 3D
wireframes to constrain true thickness of the mineralised zones.
Diagrams ● Appropriate maps and sections (with scales) and tabulations of ● The NI 43-101 Technical Report provides a variety of diagrams that
intercepts should be included for any significant discovery being reported illustrate the distribution of mineralisation, drill coverage, geological
These should include, but not be limited to a plan view of drill hole collar interpretation, and resource outlines. These include:
locations and appropriate sectional views.
● Plan view maps showing drill hole collar locations and surface
projections of the mineralised zones.
● Cross sections and long sections through key deposits (e.g., Souwa,
Chegue, Krakara) depicting lithological units, interpreted mineralisation
wireframes, and drill intercepts.
● 3D block models illustrating grade distribution and resource
classifications.
● Regional geological maps.
Balanced reporting ● Where comprehensive reporting of all Exploration Results is not ● Exploration results are presented in a manner that is consistent
practicable, representative reporting of both low and high grades and/or with balanced reporting principles. Both positive results (significant gold
widths should be practiced to avoid misleading reporting of Exploration intersections) and lower-grade or barren drilling outcomes are discussed in
Results. the report narrative. Significant intercepts are reported based on a gold
cut-off (typically 0.5 g/t Au), and intervals that do not meet this threshold
are not excluded without comment - their absence is implied where relevant.
Where drill programs encountered areas of weak mineralisation or barren
geology, this is acknowledged qualitatively in the discussion of deposit
extents and geological domains.
● Resource estimation was based on all available drilling data, not
just high-grade intervals.
Other substantive exploration data ● Other exploration data, if meaningful and material, should be ● In addition to drilling and trenching, Centamin has completed
reported including (but not limited to): geological observations; geophysical several substantive exploration programs across the Project area, including
survey results; geochemical survey results; bulk samples - size and method of extensive soil geochemistry, auger drilling, geophysical surveys, and baseline
treatment; metallurgical test results; bulk density, groundwater, geotechnical environmental studies.
and rock characteristics; potential deleterious or contaminating substances.
● Soil geochemistry: Over 92,000 soil samples were collected between
2014 and 2022 on grids varying from 400 x 400 m down to 100 x 100 m, helping
to identify coherent gold-in-soil anomalies that guided subsequent drilling.
● Auger drilling: Approximately 28,000 auger holes were drilled to
sample through laterite cover to saprolite, providing a 3D geochemical
signature where soil sampling was ineffective.
● Geophysics: Regional aeromagnetic and radiometric surveys were
conducted by government agencies, with Centamin reprocessing this data to aid
in geological interpretation and target generation. Ground-based induced
polarisation (IP) surveys were conducted selectively over key prospects to
assist in structural interpretation.
● Preliminary metallurgical testwork was performed on representative
mineralised material. Testwork indicated that gold mineralisation was amenable
to conventional gravity recovery and cyanide leaching, with excellent
recoveries (>90% extraction) achievable. Additionally, environmental
baseline studies have been completed across the Doropo permit area to support
permitting requirements.
Further work ● The nature and scale of planned further work (eg tests for lateral ● Future work will focus on advancing the deposit toward production
extensions or depth extensions or large-scale step-out drilling). readiness. Key programs planned include infill drilling to upgrade portions of
the Mineral Resource from Indicated to Measured classification, particularly
● Diagrams clearly highlighting the areas of possible extensions, in the Souwa, Chegue, and Krakara deposits. Additional step-out and
including the main geological interpretations and future drilling areas, extensional drilling is also proposed to target near-mine exploration
provided this information is not commercially sensitive. opportunities along the interpreted structural corridors, with the aim of
increasing the overall resource base.
● Further geotechnical drilling and pit slope studies are planned to
refine open-pit designs, along with additional hydrogeological investigations
to support mine dewatering strategies. Metallurgical testwork will be
expanded, including variability testing across different ore domains to
optimise processing flowsheets. Environmental and social impact assessments
(ESIA) will continue to ensure compliance with permitting obligations.
Section 3 Estimation and Reporting of Mineral Resources
(Criteria listed in section 1, and where relevant in section 2, also apply to
this section.)
Criteria JORC Code explanation Commentary
Database integrity ● Measures taken to ensure that data has not been corrupted by, for ● The drillhole database has been developed and managed using
example, transcription or keying errors, between its initial collection and industry-standard practices. Geological, geotechnical, and assay data were
its use for Mineral Resource estimation purposes. initially collected in field log sheets or digital capture tools and
subsequently entered into a centralised SQL-based database system. Data entry
● Data validation procedures used. protocols included validation checks to reduce transcription errors, including
dropdown lists for logging codes and automated field validations. Independent
verification of key fields (collar locations, assay results, geology codes)
against original laboratory certificates and field records was carried out
periodically.
● Database administration was performed by Centamin's in-house data
management team, and periodic reviews and audits were conducted to check for
consistency, missing fields, duplications, and logical errors. The database
was exported and independently validated prior to each Mineral Resource
estimation. Assay results were matched against original laboratory
certificates to ensure accuracy, and downhole survey data was checked for
consistency with expected drillhole trajectories. No material errors or
significant discrepancies were identified during validation.
Site visits ● Comment on any site visits undertaken by the Competent Person and ● Site visits were conducted by Qualified Persons (QPs) responsible
the outcome of those visits. for the Mineral Resource estimate. The site visits included direct observation
of drilling operations (RC and diamond drilling), core handling and sampling
● If no site visits have been undertaken indicate why this is the practices, geological logging procedures, and data management workflows.
case.
● During the site visits, the QP reviewed: drill collar locations,
sampling representivity (soil, auger, RC, DD), core logging facilities, QAQC
sample insertion and management, sample security and transport procedures.
● No material issues or inconsistencies were identified during the
site visits.
Geological interpretation ● Confidence in (or conversely, the uncertainty of ) the geological ● The Doropo Gold Project comprises sixteen prospects, Attire, Enioda,
interpretation of the mineral deposit. Chegue Main, Chegue South, Han, Hinda, Hinda South, Kekeda, Kilosegui, Nare,
Nokpa, Sanboyoro, Solo, Souwa, Tchouahinin, and Vako.
● Nature of the data used and of any assumptions made.
● The geological interpretation for each is based on a combination of
● The effect, if any, of alternative interpretations on Mineral surface mapping, soil geochemistry, trenching, drilling (RC and diamond core),
Resource estimation. and geophysical data. The mineralisation is structurally controlled, typically
hosted within quartz-carbonate-sulphide vein arrays aligned along
● The use of geology in guiding and controlling Mineral Resource north-northeast trending shear zones. Detailed geological logging of drill
estimation. core and RC chips provided information on lithology, alteration,
mineralisation styles, and structure, which were incorporated into the 3D
● The factors affecting continuity both of grade and geology. geological models.
● Wireframes were constructed around logged mineralisation envelopes
using a nominal cut-off of approximately 0.3 to 0.5 g/t Au, depending on
deposit and geological domain. Interpretation of geological continuity,
mineralised domain boundaries, and grade distribution is supported by
close-spaced drilling (especially in Souwa, Chegue, and Krakara) and
structural measurements taken from oriented core. Confidence in the
interpretation is high where drilling density is greater, while areas of wider
drill spacing retain a lower confidence, resulting in appropriate resource
classification into Measured, Indicated, or Inferred.
Dimensions ● The extent and variability of the Mineral Resource expressed as ● The Doropo Mineral Resource comprises multiple discrete deposits,
length (along strike or otherwise), plan width, and depth below surface to the the largest of which are Souwa, Chegue, and Krakara. These deposits are
upper and lower limits of the Mineral Resource. structurally controlled lode gold systems that occur along northeast-trending
shear zones. The mineralised zones are typically hosted in altered mafic to
intermediate volcanic rocks and are characterised by moderate to steep dips.
● The combined strike length of individual mineralised lodes within
the Doropo Project is over 12 km, with individual deposits ranging from 300 m
to over 2.5 km in length. Mineralised zones are generally 3 to 15 m thick but
can reach widths of up to 30 m in dilational zones or where stacked lodes
coalesce. The mineralisation extends from near surface to vertical depths of
100 to 250 m, with some mineralised domains drilled to 300 to 400 m vertical
depth, particularly in Souwa.
Estimation and modelling techniques ● The nature and appropriateness of the estimation technique(s) ● Software used for the Mineral Resource estimate included Geoaccess
applied and key assumptions, including treatment of extreme grade values, Professional, Leapfrog Geo, Surpac and Isatis v2018.5.
domaining, interpolation parameters and maximum distance of extrapolation from
data points. If a computer assisted estimation method was chosen include a ● The Mineral Resource estimate for the Doropo Project was estimated
description of computer software and parameters used. using Ordinary Kriging (OK) interpolation and Local Uniform Conditioning
(LUC). Estimation was conducted within hard boundary mineralisation domains
● The availability of check estimates, previous estimates and/or mine defined by 3D wireframes, constructed based on geological logging, assay
production records and whether the Mineral Resource estimate takes appropriate results, trenching, and geophysical interpretations. Drillhole data was
account of such data. composited to 1 m intervals prior to estimation. High-grade outlier values
were assessed through statistical analysis of gold grade distributions by
● The assumptions made regarding recovery of by-products. domain, and top-cuts were applied on an individual domain basis to reduce the
influence of extreme grades. In some areas a distance limiting constraint was
● Estimation of deleterious elements or other non-grade variables of applied. Variogram models were developed in Gaussian space to model the
economic significance (eg sulphur for acid mine drainage characterisation). spatial continuity of gold grades and back transformed prior to estimation.
Search ellipses were oriented along the dominant structural trends observed in
● In the case of block model interpolation, the block size in relation the mineralisation.
to the average sample spacing and the search employed.
● The block models were constructed for each deposit with a parent
● Any assumptions behind modelling of selective mining units. block size of 5 m x 5 m x 2.5 m - the assumed ultimate SMU block size and
rotated according to the orientation of the deposit. The OK interpolation was
● Any assumptions about correlation between variables. undertaken into relatively large panel blocks - predominantly 20 m x 20 m x 5
m but variable depending on deposit. Sub-blocking was utilised to accurately
● Description of how the geological interpretation was used to control honour geological and mineralisation boundaries.
the resource estimates.
● No mining dilution or recovery factors were applied; the estimate
● Discussion of basis for using or not using grade cutting or capping. reflects in-situ grades and tonnages.
● The process of validation, the checking process used, the comparison ● Only gold was estimated; no deleterious elements were modelled. No
of model data to drill hole data, and use of reconciliation data if available. by-products were considered, and no correlations between variables were
assumed as only gold was economically significant.
● The model was validated through visual inspections, comparison of
input composite grades to block grades, swath plot analysis, and global
statistical checks. No reconciliation to mining production was possible as the
Doropo Project remains pre-production at this time.
Moisture ● Whether the tonnages are estimated on a dry basis or with natural ● Tonnages are estimated and reported on a dry basis.
moisture, and the method of determination of the moisture content.
Cut-off parameters ● The basis of the adopted cut-off grade(s) or quality parameters ● The Mineral Resource estimates for the Doropo Project were reported
applied. using a 0.3 g/t Au cut-off grade. This cut-off was selected based on PFS
assumptions that reflect open pit mining methods, anticipated processing
costs, metallurgical recoveries, and a long-term gold price assumption.
● The 0.3 g/t Au cut-off represents a reasonable expectation for
economic extraction in a conventional open-pit scenario with moderate
stripping ratios and CIL (carbon-in-leach) gold recovery.
Mining factors or assumptions ● Assumptions made regarding possible mining methods, minimum mining ● Mining factors and assumptions are based on the expectation of open
dimensions and internal (or, if applicable, external) mining dilution. It is pit mining methods using conventional truck and shovel operations. Optimised
always necessary as part of the process of determining reasonable prospects pit shells were generated using Whittle optimisation software to test the
for eventual economic extraction to consider potential mining methods, but the reasonable prospects for eventual economic extraction. These pit shells
assumptions made regarding mining methods and parameters when estimating informed the reporting constraints applied to the Mineral Resource estimate.
Mineral Resources may not always be rigorous. Where this is the case, this
should be reported with an explanation of the basis of the mining assumptions ● The pit optimisations were generated by Orelogy with key mining
made. parameters summarised below;
● All models were re-blocked to 10 mX x 10 mY x 5 mRL;
● Gold price assumption of USD3,000 per troy ounce;
● Overall pit wall slope angles used are (in the range of):
o 24° in oxide;
o 28° in transitional;
o 48° in fresh;
● Mining Recovery of 92% (8% ore loss);
● Mining Dilution of 14%;
● Process Recovery:
o Oxide: 93.5%
Metallurgical factors or assumptions ● The basis for assumptions or predictions regarding metallurgical ● Preliminary metallurgical testwork has been conducted on
amenability. It is always necessary as part of the process of determining representative mineralised material from the Doropo Project. Samples were
reasonable prospects for eventual economic extraction to consider potential collected across a range of deposits (Souwa, Chegue, Krakara) and across
metallurgical methods, but the assumptions regarding metallurgical treatment different oxidation states (oxide, transitional, and fresh rock). Testwork was
processes and parameters made when reporting Mineral Resources may not always performed at certified laboratories and included gravity recovery tests,
be rigorous. Where this is the case, this should be reported with an cyanidation leaching tests, and bottle roll tests.
explanation of the basis of the metallurgical assumptions made.
● The results indicate that gold mineralisation is amenable to
conventional gravity recovery followed by CIL (carbon-in-leach) processing,
achieving high gold recoveries generally exceeding 90%. Oxide material
exhibited slightly higher recovery rates than fresh rock, but all major ore
types demonstrated favourable leach kinetics. No significant metallurgical
challenges, such as refractory gold or deleterious elements affecting
processing, were identified during initial testwork.
Environmen-tal factors or assumptions ● Assumptions made regarding possible waste and process residue ● Environmental and social baseline studies have been conducted across
disposal options. It is always necessary as part of the process of determining the project area, including flora and fauna surveys, water quality sampling,
reasonable prospects for eventual economic extraction to consider the heritage site assessments, and social impact studies. These baseline
potential environmental impacts of the mining and processing operation. While investigations were undertaken to inform the Environmental and Social Impact
at this stage the determination of potential environmental impacts, Assessment (ESIA) process, which is a legal requirement for obtaining a Mining
particularly for a greenfields project, may not always be well advanced, the Licence in Côte d'Ivoire.
status of early consideration of these potential environmental impacts should
be reported. Where these aspects have not been considered this should be ● An ESIA and Resettlement Action Plan (RAP) were prepared in
reported with an explanation of the environmental assumptions made. accordance with Ivorian regulations and submitted to the relevant authorities.
Environmental certificates and approvals have been granted as part of the
Mining Licence issuance. Key environmental risks identified (such as water
management, waste disposal, and biodiversity preservation) have been assessed
at a preliminary level and mitigation measures proposed, although final
designs (e.g., for tailings storage facilities and mine waste dumps) will be
completed during Feasibility Studies.
● There are no known environmental issues that would materially affect
the reasonable prospects of eventual economic extraction of the Mineral
Resources. Ongoing monitoring and additional environmental studies are planned
as the project advances toward development.
Bulk density ● Whether assumed or determined. If assumed, the basis for the ● Bulk density measurements were taken systematically using drill core
assumptions. If determined, the method used, whether wet or dry, the frequency samples from across the various deposits and oxidation zones (oxide,
of the measurements, the nature, size and representativeness of the samples. transitional, and fresh rock). The measurements were conducted using the
Archimedes principle (water immersion displacement method) on core samples.
● The bulk density for bulk material must have been measured by Samples were oven-dried before testing to ensure that moisture content did not
methods that adequately account for void spaces (vugs, porosity, etc), artificially influence the density readings.
moisture and differences between rock and alteration zones within the deposit.
● A substantial dataset of 19,587 bulk density measurements were
● Discuss assumptions for bulk density estimates used in the collected and statistically analysed. Density values were assigned to
evaluation process of the different materials. different oxidation domains as follows:
● Oxide material: average bulk density ~1.8-2.0 t/m³,
● Transitional material: ~2.3-2.5 tm³,
● Fresh rock: ~2.7 t/m³.
● These domain-specific densities were applied to the block model
based on the oxidation state of each block. Density variability was reviewed,
and no significant spatial inconsistencies were identified that would
materially affect the Mineral Resource estimate.
Classification ● The basis for the classification of the Mineral Resources into ● The Mineral Resource has been classified and reported in accordance
varying confidence categories. with the CIM Definition Standards. Resources were classified into Measured,
Indicated, and Inferred categories based on a combination of drilling density,
● Whether appropriate account has been taken of all relevant factors geological confidence, continuity of mineralisation, and data quality.
(ie relative confidence in tonnage/grade estimations, reliability of input
data, confidence in continuity of geology and metal values, quality, quantity ● Measured Resources were assigned in areas where drilling density was
and distribution of the data). highest (nominally on 10 m x 10 m grids), geological and mineralisation
continuity was well established, and data quality (assays, surveys, logging)
● Whether the result appropriately reflects the Competent Person's was considered excellent.
view of the deposit.
● Indicated Resources were defined in areas of moderate drilling
density (typically 25 m to 30 m spacing) where mineralisation continuity and
geological controls were reasonably well understood.
● Inferred Resources were assigned to zones with broader drill spacing
up to 50 m x 50 m, lower geological confidence, or where extrapolation
beyond drilling data was required.
● The classification approach appropriately reflects the level of
confidence in the underlying geological models, sampling methods, and assay
results.
Audits or reviews ● The results of any audits or reviews of Mineral Resource estimates. ● No independent audit has been completed on the Doropo Mineral
Resource Estimate.
● Cube undertook regular internal peer reviews during the course of
the MRE work.
Discussion of relative accuracy/ confidence ● Where appropriate a statement of the relative accuracy and ● The relative accuracy and confidence of the Doropo Mineral Resource
confidence level in the Mineral Resource estimate using an approach or estimates are considered appropriate for the classification levels assigned.
procedure deemed appropriate by the Competent Person. For example, the
application of statistical or geostatistical procedures to quantify the ● No production data is available for direct reconciliation, as the
relative accuracy of the resource within stated confidence limits, or, if such project is still in the exploration and development phase.
an approach is not deemed appropriate, a qualitative discussion of the factors
that could affect the relative accuracy and confidence of the estimate. ● At the global scale, the Mineral Resource estimate is considered to
have an accuracy commensurate with industry expectations for a project at the
● The statement should specify whether it relates to global or local advanced exploration and prefeasibility stages.
estimates, and, if local, state the relevant tonnages, which should be
relevant to technical and economic evaluation. Documentation should include
assumptions made and the procedures used.
● These statements of relative accuracy and confidence of the estimate
should be compared with production data, where available.
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