13 June 2024
AIM: AAU
DOKWE PROJECT: REVISED
MINERAL RESOURCE ESTIMATE
1.8Moz gold defined with 40%
increase in Resources
Ariana Resources plc ("Ariana" or
"the Company"), the AIM-listed mineral exploration and development
company with gold project interests in Africa and Europe, is
pleased to announce the completion of a revised Mineral Resource
Estimate ("MRE") of both Dokwe North and Dokwe Central, which now
contain a combined 1.83Moz of gold. Ariana has entered into a
conditional agreement to acquire 100% of Rockover Holdings Limited
("Rockover") via merger, and currently holds circa 2.1% of
Rockover. Rockover owns 100% of the Dokwe North and Central Gold
Projects in Zimbabwe ("Dokwe"). This
Resource Estimate has been prepared by the Ariana technical team
under the leadership of Mr. Zack van Coller and is based on a
detailed review of all available drilling data acquired from 2004
through to 2023 over ten phases of drilling.
Highlights:
·
Global JORC 2012 Resource of 55.9Mt @ 1.02g/t Au
for 1.83Moz of gold, with opportunities identified for further
resource growth.*
·
40% increase in JORC 2012 Resources, with the
addition of Dokwe Central and revisions to the geological models at
both Dokwe North and Central.
·
Measured and Indicated Resuources are 1,341koz
(previously 1,202koz) and Inferred Resources 490koz (previously
23koz).
·
JORC 2012 Reserves to be revised following new pit
optimisations; current Reserves of 0.8Moz of gold as defined in the
2022 pre-feasibility study.
·
Opportunities identified in regional exploration
datasets to further increase the resource potential of the wider
Dokwe Project Area.
·
Planning for further revisions to the
pre-feasibility study underway, with expectations that these will
form part of a future feasibility study on conclusion of the Merger
with Rockover.
Important Note:
* Stated gross with respect to
Rockover Holdings Limited (RHL) which is the operator of which
Ariana currently holds 2.1%. The resources quoted include Dokwe
North and Dokwe Central. Accordingly, and taking into account the
proposed acquisition of RHL by Ariana which is currently subject to
Ariana Shareholder approval, the resource figures are only
presented on a gross basis. Were this acquisition not to proceed,
the resources will be represented on the basis of Ariana's net
attributable interest as aforesaid. All resources stated herein are
under JORC (2012).
To read a
pdf version of the announcement, please click here: http://www.rns-pdf.londonstockexchange.com/rns/2045S_1-2024-6-12.pdf
Dr. Kerim Sener, Managing Director,
commented:
"The latest Mineral Resource Estimate for the Dokwe Gold
Project demonstrates the considerable upside potential of this
substantial exploration and development opportunity. With a Global
JORC 2012 Measured, Indicated and Inferred Resource of over 1.8Moz
of gold across Dokwe North and Central, this represents a 40%
uplift in resources from the previous estimate. A significant
contribution to this uplift is due to the update of Dokwe Central
in compliance with JORC 2012. Measured and Indicated Resources
currently comprise 73% of the total resource, much of which sits
within the historic optimised pits. If Inferred Resources are also
included, approximately 1.1Moz of gold sits within the previously
designed or optimised pits. This suggests the potential to
significantly enhance Reserves (currently 0.8Moz of gold) in future
economic studies.
"In the coming weeks, we will be commencing a new set of pit
optimisations for the Dokwe Project to better constrain the
specific part of the resource that could be amenable to extraction
via open-pit mining using current economic parameters. The prior
optimisations on which the present in-pit resources were
constrained were undertaken at a gold price of US$1,800 per ounce
and are now considered too conservative for long-term planning
purposes. The new pit optimisations will be undertaken at US$2,000
and US$2,500 per ounce, reflective of the current price range of
the commodity.
"Our assessment of the Dokwe Project has improved
significantly during the period in terms of diligence and we see
opportunities for significant exploration upside to the established
resources at North and Central, in addition to camp-scale potential
in the wider area. As with many Archaean greenstone belt terranes,
major gold deposits tend to occur as clusters within distinct
multi-million ounce "camps", occurring along crustal-scale shear
zones. All of these elements are present in the Dokwe region,
including several untested gold-in-soil anomalies, and this bodes
well for our long-range strategy to develop the Dokwe Project as a
modern mining hub in Zimbabwe."
"Ultimately, we see an opportunity to define a
multi-million-ounce resource development project at Dokwe. On
conclusion of the merger with Rockover, we are excited to commence
work on the Feasibility Study, which will investigate the potential
to develop both Dokwe North and Central over an open-pit mine life
of up to 15 years to produce at least 1Moz of gold. We are engaging
with various project consultants concerning this work and are
considering various finance approaches, including the planned ASX
listing, to accelerate our work programmes at Dokwe and across our
wider portfolio."
This announcement contains inside information for the purposes
of Article 7 of EU Regulation 596/2014.
About the Dokwe Project
The Dokwe North and Dokwe Central
gold deposits are located 2km apart ("Dokwe Project") and are
situated in the Tsholotsho District 110km WNW of Bulawayo, Zimbabwe
(Figure 1). Bulawayo is the
second largest city in Zimbabwe (population of c. 660,000) with
excellent road, rail and air links to the rest of the country and
internationally, and represents a significant mining services and
educational centre, hosting both the Zimbabwe School of Mines and
the National University of Science and Technology.
The Dokwe Project was discovered by
Rockover in 2002, utilising innovative soil geochemical exploration
methods capable of detecting mineralisation beneath cover, and
subsequently drill-tested for the first time in 2004.
It represents the largest undeveloped gold project
in Zimbabwe and is currently owned by Rockover Holdings Limited
("Rockover"). Ariana is in the process of acquiring the Dokwe
Project via an all-share merger with Rockover, which is due to
close at the end of June, subject to an Ariana shareholder meeting
and shareholder approval.
Between November 2023 and April
2024, the Ariana team conducted a detailed Due Diligence ("DD")
review of the Dokwe North and Dokwe Central gold deposits to
confirm historic results, and better understand their setting,
style, and key ore characteristics (AIM: 6 June 2024). Ariana
drilled four holes totalling 1,222 metres of orientated diamond
drill core, which enabled confirmation of historic grades, density
analysis and a study of the structural features within each
deposit. This work was enhanced by 21,662 metres of new X-ray
Fluorescence (pXRF) multi-element analysis on drill core at
one-metre spacings across 37 historic holes. The new data has
comprehensively advanced our understanding of the deposit geology
and controls on mineralisation.
Background
In May 2022, An Independent
Competent Person's Report, in accordance with the JORC Code, 2012
Edition, was completed as part of a pre-feasibility study on Dokwe
North by Johannesburg-based company Minxcon Consulting (Pty) Ltd.
This was contracted by Rockover Holdings Limited to validate Dokwe
North's Mineral Resources and Ore Reserves. The study included a
mine plan and financial analyses.
The Mineral Resources for Dokwe
Central were last estimated by Digital Mining Services, and
reported by Canister Resources Limited (a 100% owned subsidiary of
Rockover Holdings Limited), in January 2011 in accordance with the
JORC Code, 2004 Edition. The revised resource announced within this
release expands on the work completed in 2011 and reports the new
Mineral Resources in accordance with the JORC Code, 2012 Edition.
The work presented here has validated and expanded on the prior
work at Dokwe North and Central, and the Mineral Resource estimates
have incorporated new data and revised modelling methods
accordingly.
Figure 1: Summary map of Dokwe
North and Central showing the outline of the designed
pre-feasibility pit for Dokwe North and the optimised pit (not
included in the pre-feasibility) for Dokwe Central. The 2024 MRE
domain outlines are shaded in pink. Ariana's 2023-2024 due
diligence drilling collars are also shown in magenta.
Resource Estimation
This Resource Estimate has been
prepared by the Ariana technical team under the leadership of Mr.
Zack van Coller and is based on a detailed review of all available
drilling data acquired from 2004 through to 2023 over ten phases of
drilling. This data comprises 141 diamond drill holes and 57
percussion drill holes across both resource areas. For Dokwe North,
the total metres drilled is 32,663m (116 holes), and for Dokwe
Central 5,271m (25 holes), for a combined total of 37,934m of
drilling. The average collar spacing in Dokwe North is
approximately 50m and 30m at Dokwe Central.
The estimation method used for the
current iteration of the Dokwe North and Central Resources is an
Inverse Distance Weighting Squared ("IDW2") estimation. For Dokwe
North, the estimation was validated using a separate Ordinary
Kriging ("OK") estimation study. A supporting Quantitative Kriging
Neighbourhood Analysis ("QKNA") was completed to validate the 2022
estimation block size and number of sample inputs. A study of
discretisation and drill hole limiting was not re-evaluated; inputs
from previous work were deemed satisfactory. Additionally, a grade
interpolation model, using a 0.15g/t Au cut-off, was used to
further "test" the resource and validate statistics. The Mineral
Resource Estimate was categorised based on the input data quality,
validation of standards, the review of quality assurance and
quality control protocols, range of the respective semi-variograms,
number of drillholes, minimum and maximum number of samples and the
performance of multiple search passes within the
estimate.
In late 2023, the Ariana team
completed a drone survey over the Dokwe North area which captured
2,600 detailed aerial images to produce a high-resolution
(4cm/pixel) photogrammetry map. This was used to validate and
locate all historic collars within the immediate Dokwe North area
to within 1m accuracy. Drill collars at Dokwe Central were visited
and confirmed by handheld GPS to within 5m accuracy.
Estimation Methodology
The latest MRE is based primarily on
the input of new geological understanding derived from over 21,000
pXRF readings taken on drill core throughout the main resource
areas. Detailed studies of the multi-element data have identified
key pathfinder elements attributed to various mineral-hosting
lithologies; resulting in accurate three-dimensional
lithostratigraphic models produced in Leapfrog Geo. The new
lithostratigraphic models are used in the latest MRE as domains
within which gold is estimated. This type of model differs from
more commonly used estimation methods where a commodity grade shell
is created either by multiple sections or through mathematical
interpolation.
Both deposit areas use lithological
composites manually created in Leapfrog Edge using a combination of
geological logging and pXRF results of specific pathfinder elements
including; Ca, Ce, Co, Cu, Mn, Ni, Rb, Zn and Zr. These were used
to determine the lithological boundaries and volumes of a domain.
Estimation composites of gold grade within each lithology domain
were completed using a 1m best-fit routine. The application of a
"semi-soft" boundary with a 1m range was used in the estimation to
allow data points with value located outside (to a maximum distance
of 1m) of the domain boundaries to influence the internal boundary
estimation grade.
At Dokwe North, analysis of gold
grade composite values within each lithological domain identified
bias of higher gold values exceeding 20g/t Au and up to 1,885g/t Au
in some of the major lithologies (quartz-feldspar porphyry, felsic
tuff, dacite and the lower agglomerate). A closer evaluation of the
data showed no significant clustering of higher grade to warrant
high-grade sub-domaining. To preserve some of the documented high
grade within the deposit, it was determined that an Outlier
Restriction should be applied instead of a top-cut. This reduces
the bias by constraining the effect of high values at a distance
(approximately 17 metres in this case). To prevent excess influence
of extreme grades (over 100g/t Au), values beyond the restricted
distance were clamped to 50g/t Au. This was further constrained in
the "Pass 3" (Inferred) component of the resources to a 10g/t Au
clamp.
Composite domain values at Dokwe
Central displayed similar bias of higher grades. However,
concerning average grades overall, the deposit is sensitive to the
application of an upper cut due to a high variability in grade
between the 95th and 99th percentile spread.
Further work is required to sub-domain higher grades within the
deposit, particularly at depth, where fewer drill holes are
available for the current modelling. An appropriate top-cut
application for Dokwe Central would be 10g/t Au. However, to
preserve high-grade (multiple composites above 20g/t Au) locally
within the estimation domain, an Outlier Restriction was applied
with a grade clamp of 20g/t Au. The Outlier Restriction within the
Indicated portion of the Resource allows high-grade samples to
influence surrounding blocks to 40% of the sample search distance
(approximately 16 metres).
A Specific Gravity ("SG") estimation
model was established for Dokwe North. 475 SG readings from 22
drillholes were coded into the final block model. This data
includes 158 verification samples taken by Ariana during the
company's DD review. Average SG measurements across Dokwe North
range from 2.71g/cm3 in the oxide zone,
2.76g/cm3 in the transitional zone to
2.81g/cm3 in the sulphide zone. No historic SG data
exists for Dokwe Central. However, Ariana acquired 92 measurements
through the deposit profile from two drill holes completed during
its 2023 DD programme. The average SG for these 92 measurements is
2.69g/cm3. This was applied to the Dokwe Central model
as a constant value.
The Dokwe North database has over
17,000 structural measurements which have dominantly been acquired
digitally from historic core photos from 25 orientated diamond
drill holes. Most of this data was accumulated between 2020 and
2021 with the use of specialist software; SteroCore PhotoLog.
Ariana has applied this data in its geological modelling studies to
identify key structural inputs, which may provide further insight
into specific controls on mineralisation. Furthermore, during
Ariana's logging of the DD diamond holes, 198 structural
measurements were manually taken using a Rocket Launcher tool.
These measurements are being used as a means for validating all
other structural data held in historic archives. To date, at least
three dominant structural features have been identified within
Dokwe North. These features have been modelled into the latest MRE
work and used to supplement the variography supporting the MRE.
Dokwe Central has very limited structural measurements. However,
Ariana acquired 148 new measurements using a Rocket Launcher tool.
These readings are being used to support the 3D geological
modelling completed as a foundation for the Dokwe Central Mineral
Resource estimate.
Variogram modelling for Dokwe North
was completed to support estimation search ellipse orientations,
and also for cross-checking the IDW2 estimation with an OK model.
Good variography was generally achieved for the majority of
mineralised lithological domains. However, coefficient of variation
("CV") values within the supporting statistics suggests that
further sub-domaining of lithological volumes is required to
achieve better variograms. This is likely because the Dokwe North
deposit displays at least two episodes of folding. Sub-domaining of
fold limbs in future work will provide more robust statistical
analysis. Further work will also look to create additional
sub-domains of key mineralising controls, such as fault
zones.
Validation of the variogram was
attempted for Dokwe Central. However, no reasonable variogram could
be obtained without cutting the data to the 95th
percentile, which in the case of Dokwe Central is 10g/t Au. With
this cut applied, a nugget effect of 2.74g/t Au is recorded; but
without the top-cut, the nugget effect is considered to be
approximately 18g/t Au, which is unreasonable. On this basis, an OK
estimation was not completed. Variography was used in creating a
search ellipse to support an IDW2 estimation.
Weathering is deemed to be logged
consistently through the Dokwe North deposit. A total of 14,220
metres of core was logged as "Primary" or Sulphide; 3,016 metres as
"Moderate" or Transitional, and 5,671 metres as "Weathered" or
Oxide across 103 diamond drill holes (Table 4).
For both deposit areas, an
orthogonal non-rotated block model was established using block
sizes determined to be optimal for the dataset and wireframe
geometry. For Dokwe North this was 20m x 20m x 5m (X, Y, Z), and
for Dokwe Central 10m x 10m x 5m (X, Y, Z). Oblique views of the
block models, drilling and open pits for Dokwe North and Dokwe
Central can be seen in Figures
2 and 3,
respectively.
Figure 2: Summary section of
Dokwe North showing the outline of the 2022 designed
pre-feasibility pit for Dokwe North.
Figure 3: Summary sections of
Dokwe Central showing the outline of the historic optimised pit
(not included in the 2022 pre-feasibility) for Dokwe
Central.
Resource Classification
The Dokwe Project MRE is classified
in accordance with the JORC Code (2012) as Measured, Indicated and
Inferred Resources (Tables 1-
4). The style of mineralisation has been identified, the
controls on mineralisation are well understood and measurements and
sampling completed to a reasonable degree of confidence for the
mineralisation present (Appendix
1). Approximately 33% of the global resource is classified
as Measured and 40% is classified as Indicated. It is considered
reasonable to expect that some of the Inferred Mineral Resources
could be re-classified as Indicated Mineral Resources with
continued exploration; however, due to the uncertainty of Inferred
Mineral Resources it should not be assumed that such upgrading will
always occur. It is also reasonable to expect that portions of the
Indicated Mineral Resources could be upgraded to Measured Mineral
Resources with some additional infill data. Reporting of tonnages
and metal content is based on the application of a 0.3g/t Au
reporting cut-off for both Dokwe North and Dokwe Central (Table 1,
2 and 3). Indicated resources for Dokwe Central are presented here
by only what is captured by optimisation work completed previously.
Confidence in the estimate of the Mineral Resources is sufficient
to allow the results of the application of technical and economic
parameters to be used for further planning in a Feasibility Study.
However, additional drilling may be required to help support an
Environmental Impact Assessment as well as other technical studies.
In addition to supporting a Feasibility Study, this new Mineral
Resource Estimate will assist in the targeting of future
exploratory and resource drilling to expand the resource further,
particularly in areas surrounding the northern extents of Dokwe
North and the deeper extents of Dokwe Central.
Table 1: Summary of Global
Resources for the Dokwe Project at various reporting cut-off
grades. The pre-feasibility study completed in 2022 used a 0.3g/t
Au cut-off grade and the variation around this grade is shown in
the table below, based on the new geological model. The extended
modelling of peripheral low-grade within the Dokwe North deposit in
this latest study has allowed a significant increase to overall
Inferred Resources. It is deemed that 0.3g/t Au reporting cut-off
(in bold) presently best represents the economic cut-off based on
prior optimisation studies. Figures in the table may not sum
precisely due to rounding.
Reporting cut-off (g/t
Au)
|
Measured
|
Indicated
|
Inferred
|
Total
|
Tonnes
|
Au (g/t)
|
Au(oz)
|
Tonnes
|
Au (g/t)
|
Au(oz)
|
Tonnes
|
Au (g/t)
|
Au(oz)
|
Tonnes
|
Au (g/t)
|
Au(oz)
|
0.2
|
16,923,000
|
1.15
|
624,000
|
28,930,000
|
0.87
|
811,000
|
33,418,000
|
0.54
|
579,000
|
79,271,000
|
0.79
|
2,014,000
|
0.3
|
13,757,000
|
1.35
|
599,000
|
20,137,000
|
1.15
|
742,000
|
21,994,000
|
0.69
|
490,000
|
55,888,000
|
1.02
|
1,831,000
|
0.4
|
11,335,000
|
1.57
|
572,000
|
15,441,000
|
1.39
|
690,000
|
14,951,000
|
0.86
|
412,000
|
41,727,000
|
1.25
|
1,674,000
|
0.5
|
9,285,000
|
1.82
|
542,000
|
12,202,000
|
1.64
|
644,000
|
12,098,000
|
0.95
|
371,000
|
33,585,000
|
1.44
|
1,557,000
|
Table 2: Summary of 2024 Dokwe
Project JORC 2012 compliant Mineral Resource Estimate, based on 141
drill holes (dated 13 June 2024). Reporting is based on a 0.3g/t Au
cut-off grade for both Dokwe North and Dokwe Central. Figures in
the table may not sum precisely due to rounding.
Classification
|
Tonnage
(t)
|
Grade
|
Metal
Content
|
Au
(g/t)
|
Au
(oz)
|
Measured
|
13,757,000
|
1.35
|
599,000
|
Indicated
|
20,137,000
|
1.15
|
742,000
|
Inferred
|
21,994,000
|
0.69
|
490,000
|
Global
Total
|
55,888,000
|
1.02
|
1,831,000
|
Table 3: Summary of the 2024
Dokwe Project JORC 2012 compliant Mineral Resource Estimate
outlining the weathering state by classification for each deposit
area at a reporting cut-off of 0.3g/t Au. Figures in the table may
not sum precisely due to rounding.
Deposit
Area
|
Weathering
|
Classification
|
Tonnage
(t)
|
Grade
|
Metal
Content
|
Au
(g/t)
|
Au
(oz)
|
DOKWE NORTH
|
Oxide
|
Measured
|
2,895,000
|
1.27
|
118,000
|
Indicated
|
2,971,000
|
1.00
|
96,000
|
Inferred
|
3,137,000
|
0.82
|
83,000
|
Sub Total
|
9,003,000
|
1.03
|
297,000
|
Transitional
|
Measured
|
3,380,000
|
1.15
|
125,000
|
Indicated
|
2,827,000
|
0.80
|
73,000
|
Inferred
|
1,535,000
|
0.66
|
32,000
|
Sub Total
|
7,741,000
|
0.92
|
230,000
|
Sulphide
|
Measured
|
7,482,000
|
1.48
|
356,000
|
Indicated
|
13,089,000
|
1.22
|
512,000
|
Inferred
|
14,998,000
|
0.57
|
275,000
|
Sub Total
|
35,570,000
|
1.00
|
1,142,000
|
DOKWE CENTRAL
|
Sulphide
|
Indicated
|
1,250,000
|
1.54
|
62,000
|
Inferred
|
2,324,000
|
1.34
|
100,000
|
Sub Total
|
3,574,000
|
1.41
|
162,000
|
|
Global
Total
|
55,888,000
|
1.02
|
1,831,000
|
Table 4: A summary of the 2024
Dokwe Project JORC 2012 compliant Mineral Resources captured by the
2022 PFS designed (Dokwe North), and optimisation (Dokwe Central)
pits defined from the previous iteration of the Dokwe North 2022
and Dokwe Central 2011 Mineral Resources. New optimisation work
will be completed to accommodate the latest 2024 estimation as part
of the declaration of revised Reserves. Figures in the table may not sum precisely due to rounding.
Resources are stated at a 0.3g/t Au reporting cut-off.
Project
Area
|
Pit
Status
|
Classification
|
Tonnage
(t)
|
Grade
|
Metal
Content
|
Au
(g/t)
|
Au
(oz)
|
DOKWE
NORTH
|
In Pit
2022 Designed
|
Measured
|
13,296,000
|
1.37
|
587,000
|
Indicated
|
10,141,000
|
1.36
|
443,000
|
Inferred
|
1,693,000
|
0.86
|
47,000
|
Sub Total
|
25,130,000
|
1.33
|
1,077,000
|
Out of
Pit
|
Measured
|
461,000
|
0.81
|
12,000
|
Indicated
|
8,746,000
|
0.84
|
237,000
|
Inferred
|
17,890,000
|
0.59
|
342,000
|
Sub Total
|
27,097,000
|
0.68
|
591,000
|
DOKWE
CENTRAL
|
In
Pit
Optimisation
|
Indicated
|
1,250,000
|
1.54
|
62,000
|
Out of
Pit
|
Inferred
|
2,324,000
|
1.34
|
100,000
|
|
Sub Total
|
3,574,000
|
1.41
|
162,000
|
|
|
In Pit
Total
|
26,380,000
|
1.34
|
1,139,000
|
|
|
Total
|
55,801,000
|
1.02
|
1,830,000
|
Important Note:
All resources in the tables above
are under JORC (2012) and are stated gross with respect to Rockover
Holdings Limited (RHL), which is the operator, taking into account
the proposed acquisition of RHL by Ariana which is currently
subject to Ariana Shareholder approval. Were this acquisition not
to proceed, the resources will be represented on the basis of
Ariana's net attributable interest of 2.1%.
Mineral Resource Comparison (Dokwe North)
Mineral resources for Dokwe North
were previously reported in May 2022 by Johannesburg-based company
Minxcon Consulting (Pty) Ltd ("Minxcon"). The estimation
methodology used by Minxcon was a cross-validation Ordinary Kriging
with secondary Inverse Distance Weighting Squared
estimation.
The resource domains used within
Minxcon's estimation were based on a 0.2g/t Au grade-shell
interpolation with a "soft" boundary higher-grade 0.7g/t Au
internal core. In the absence of good geological data, and to
identify grade continuity, this method of mineralisation modelling
is widely accepted. The three-dimensional modelling and estimation
method by Minxcon was completed to an excellent standard. However,
the grade-shell interpolations created have two complications: 1)
Other than grade continuity correlations, no geological factors are
built into the model i.e.,
lithological units, folding, faulting and/or other potential
geological controls; and 2) Numerical interpolation models tend to
be very conservative with regards to Inferred Resources as
iso-surfaces only form volumes in proximity to known data
points.
Key comparisons between the 2022
Minxcon MRE and the 2024 Ariana MRE includes (Dokwe
North):
·
The latest iteration of the Dokwe North modelling
is based on accurately identifying logged geological units with the
support of over 21,000 multi-element pXRF readings.
·
It is now understood from the geologically driven
model that 40% of identified mineralisation is hosted within a
weakly metamorphosed dacite unit, with a further 35% within a
felsic tuff (Table 5).
Interestingly, the felsic tuff unit has been identified with
mineralisation in several holes away from the main deposit core,
outlining significant direction for future exploration
work.
·
The new lithologically driven volumes created in
Ariana's estimation have resulted in each lithology being
considered as its domain with its estimation inputs, giving a more
robust estimation result, and allowing for suitable extrapolation
of Inferred Resources to aid future exploration.
·
The Minxcon estimation utilised a 39.62 g/t Au
top-cut on its high-grade domain and 21.31g/t Au top-cut on its
low-grade domain. Ariana's evaluation identified the application of
a grade outlier-restriction method to be more suitable for the
preservation of high-grades (grades exceeding 50g/t Au). This has
partly affected the average grade in the Measured and Indicated
categories of the deposit by 30% and 9%, respectively.
·
Both Minxcon and Ariana utilise a three-pass
search volume method in which to classify resources. Both companies
further utilise Kriging Slope of Regression ("SoR") outputs to aid
classification. However, to improve uniformity of the
classification categories within Ariana's estimation a Pass 1 and
Pass 2 interpolation volume was built.
·
The 2022 MRE is dominated by Indicated Resources
(22.92Mt), versus Ariana's (20.14Mt) (Figure 4). Additional drilling
completed by Ariana and a better understanding of the data has led
to some of the Indicated Resources being converted to Measured
Resources. Other differences are likely the result of peripheral
inputs attributed to the classification methods being
used.
·
Ariana's 2024 MRE demonstrates significant
resource upside in terms of Inferred Resources. This is a direct
result of a better understanding of the geology to allow
appropriate extrapolation of mineralisation to occur within the
model.
·
In terms of domain volumes, Ariana's model shows a
33% increase in mineralisation volume (Figure 5). However, this additional
volume is generated entirely from the geological extrapolation of
the Inferred Resources. Due to the lack of accurate lithological
data and type of modelling method used by Minxcon, it was not
possible to identify potential zones for Inferred Resources. The
Measured and Indicated components of the both resources have very
similar volumes.
Figure 4: A
summary comparison of the 2022 Minxcon MRE estimation tonnages and
ounces versus the Ariana 2024 MRE. The Ariana estimate shows some
conversion of Indicated Resources outlined in 2022 to Measured
Resources. The Minxcon modelling lacks the identification of
potential resource growth in the Inferred category.
Figure 5: A
summary comparison of the 2022 Minxcon MRE estimation volumes, and
Ariana's 2024 MRE volumes. With respect to Measured and Indicated
Resources, both models have produced similar volumes, this is
because both companies have utilised similar methods to categorise
these resources. However, with Ariana's increase in geological
confidence, additional volumes have been created for Inferred
Resources.
Table 5: A summary of the 2024
Dokwe Project JORC 2012 compliant Mineral Resources
compartmentalised by the modeled lithological units within each
deposit area. Resources are stated at a 0.3g/t Au reporting
cut-off. For Dokwe North, the primary mineralised lithologies are
the Felsic Tuffs, and the underlying dacite which make up 75.1% of
the DN resource. Significant exploration potential exists within
the "Northern Limb" Felsic Tuff, and the "Faulted Deep" Felsic
Tuff. Figures in the table may not sum
precisely due to rounding.
Project
Area
|
Lithology
|
Density
(g/cm3)
|
Tonnage
(t)
|
Grade
|
Metal
Content
|
%
of Local
Resource
|
%
of Global
Resource
|
Au (g/t)
|
Au (oz)
|
Dokwe
North
|
Upper
Agglomerate
|
2.67
|
1,670,000
|
0.61
|
32,900
|
2.0
|
1.8
|
Quartz
Feldspar Porphyry
|
2.72
|
4,773,000
|
0.91
|
140,000
|
8.4
|
7.7
|
Felsic
Tuff
|
2.81
|
17,353,000
|
1.05
|
583,600
|
35.0
|
31.9
|
Dacite
|
2.83
|
16,730,000
|
1.25
|
669,800
|
40.1
|
36.6
|
Lower
Agglomerate
|
2.85
|
2,697,000
|
0.95
|
82,500
|
4.9
|
4.5
|
Andesite
|
2.86
|
5,766,000
|
0.53
|
97,700
|
5.9
|
5.3
|
"Northern
Limb" Felsic Tuff
|
2.83
|
1,479,000
|
0.50
|
23,900
|
1.4
|
1.3
|
"Faulted
Deep" Felsic Tuff
|
2.79
|
1,846,000
|
0.65
|
38,500
|
2.3
|
2.1
|
Dokwe North
Sub Total
|
2.81
|
52,314,000
|
0.99
|
1,668,900
|
100.0
|
91.2
|
Dokwe
Central
|
Biotite
Schist
|
2.69
|
3,574,000
|
1.41
|
161,700
|
100.0
|
8.8
|
Dokwe Central Sub
Total
|
2.69
|
3,574,000
|
1.41
|
161,700
|
|
|
GLOBAL
TOTAL
|
-
|
55,801,000
|
1.02
|
1,830,000
|
|
|
Mineral Resource Comparison (Dokwe Central)
The Mineral Resources for Dokwe
Central were last estimated by Digital Mining Services, and
reported in January 2011 in accordance with the JORC Code, 2004
Edition. The work completed by Ariana aimed to validate input
parameters and supporting statistics.
The 2011 estimation domains were
manually constructed wireframes base on three vertically oriented
mineralised bodies (Figure 6A). The 2024 Ariana estimation domains
are based on a lithological model between two primary geological
packages; hanging wall biotite schists (mineralised) and footwall
sedimentary gritstones/conglomerates (barren). Separating the two
geological packages is a significant east-west trending fault (very
similar to the 2011 interpretations). Mineralisation was restricted
from extrapolating across to the "barren" sedimentary units. Within
the biotite mineralisation package search ellipse inputs were used
from the 2011 MRE to re-establish and validate mineralisation
continuity in the new model (Figure 6B).
The 2011 MRE was evaluated to be
very conservative with wireframe boundaries being very restrictive
in joining clusters of mineralised composites. Interpolation
modelling with support from pXRF data from eight diamond drill
holes, as well as additional new drill holes drilled at the deposit
since 2011 (mainly two new holes drilled by Ariana in 2023), has
made more representative iso-surface volumes as an update to
mineralisation interpretations (Table 6).
The work completed by Ariana at
Dokwe Central has validated historic resources and expanded on the
mineralisation interpretations. The supporting data and resulting
estimations have been updated and are now reported in accordance
with the JORC Code, 2012 edition.
Figure 6: A)
the 2011 geological interpretation of the Dokwe Central deposit. B)
The 2024 interpretation. Both models have identified the same
trends and constraints on mineralisation. However, the 2024
estimation is backed by additional drilling, pXRF geochemistry and
updated modelling methods; resulting in an overall larger volume of
mineralisation being established.
Table 6: A
comparison table of the 2011 estimation results for Dokwe Central
against the revised 2024 estimation results at 0.2, 0.4 and 1g/t Au
reporting cut-offs. The revised Ariana estimation utilised new
drilling data, modelling methods and the input of pXRF geochemistry
to define the extent of mineralisation (also showing the 0.3 g/t Au
case).
|
Reporting cut-off (g/t
Au)
|
Indicated
|
Inferred
|
Total
|
|
Tonnes
|
Grade (g/t)
|
Au(oz)
|
Tonnes
|
Grade (g/t)
|
Au(oz)
|
Tonnes
|
Grade (g/t)
|
Au(oz)
|
2011
MRE
|
0.2
|
661,000
|
2.09
|
44,000
|
528,000
|
2.09
|
36,000
|
1,189,000
|
2.09
|
80,000
|
0.4
|
645,000
|
2.13
|
44,000
|
495,000
|
2.21
|
35,000
|
1,139,000
|
2.17
|
79,000
|
1
|
527,000
|
2.46
|
42,000
|
373,000
|
2.73
|
33,000
|
900,000
|
2.57
|
74,000
|
|
Reporting cut-off (g/t
Au)
|
Indicated
|
Inferred
|
Total
|
|
Tonnes
|
Grade
|
Au(oz)
|
Tonnes
|
Grade
|
Au(oz)
|
Tonnes
|
Grade
|
Au(oz)
|
2024
MRE
|
0.2
|
2,081,000
|
1.22
|
82,000
|
2,627,000
|
1.05
|
89,000
|
4,708,000
|
1.13
|
171,000
|
0.3
|
1,250,000
|
1.54
|
62,000
|
2,324,000
|
1.34
|
100,000
|
3,574,000
|
1.41
|
162,000
|
0.4
|
1,357,000
|
1.72
|
75,000
|
1,486,000
|
1.64
|
78,000
|
2,843,000
|
1.68
|
154,000
|
1.0
|
799,000
|
2.48
|
64,000
|
998,000
|
2.11
|
68,000
|
1,797,000
|
2.28
|
131,000
|
Both of the final
JORC Tables for the revised MRE for the Dokwe
Project will be made available on the corporate
website.
Contacts:
Ariana Resources plc
|
Tel: +44 (0) 20 7407 3616
|
Michael de Villiers,
Chairman
|
|
Kerim Sener, Managing
Director
|
|
Beaumont Cornish Limited (Nominated Adviser)
|
Tel: +44 (0) 20 7628 3396
|
Roland Cornish / Felicity
Geidt
|
|
Panmure Gordon (UK) Limited (Joint Broker)
|
Tel: +44 (0) 20 7886 2500
|
Hugh Rich / Atholl Tweedie / Rauf
Munir
|
|
WHIreland Limited (Joint Broker)
Harry Ansell / Katy Mitchell /
George Krokos
Yellow Jersey PR Limited (Financial PR)
|
Tel: +44 (0) 207 2201666
Tel: +44 (0) 7983 521 488
|
Dom Barretto / Shivantha Thambirajah
/
Bessie Elliot
|
arianaresources@yellowjerseypr.com
|
Beaumont Cornish Limited ("Beaumont Cornish") is the Company's
Nominated Adviser and is authorised and regulated by the FCA.
Beaumont Cornish's responsibilities as the Company's Nominated
Adviser, including a responsibility to advise and guide the Company
on its responsibilities under the AIM Rules for Companies and AIM
Rules for Nominated Advisers, are owed solely to the London Stock
Exchange. Beaumont Cornish is not acting for and will not be
responsible to any other persons for providing protections afforded
to customers of Beaumont Cornish nor for advising them in relation
to the proposed arrangements described in this announcement or any
matter referred to in it.
Editors' Note:
The information that relates to
Exploration Results is based upon information compiled by Mr. Zack
van Coller BSc (Hons), Targeting Group Leader, Ariana Resources
plc. Mr. van Coller is a Fellow of The Geological Society of
London, and has sufficient experience which is relevant to the
style of mineralisation and type of deposits under consideration
and to the activity which he is undertaking to qualify as a
Competent Person as defined by the 2012 edition of the Australasian
Code for the Reporting of Exploration Results, Mineral Resources
and Ore Reserves (JORC Code). Mr. van Coller has over 10 years of
relevant experience in the Technical Assessments of Mineral
Properties. Mr. van Coller consents to the inclusion in the report
of the matters based on his information in the form and context in
which it appears.
The information in this announcement
that relates to exploration results is based on information
compiled by Dr. Kerim Sener BSc (Hons), MSc, PhD, Managing Director
of Ariana Resources plc. Dr. Sener is a Fellow of The Geological
Society of London and a Member of The Institute of Materials,
Minerals and Mining and has sufficient experience relevant to the
styles of mineralisation and type of deposit under consideration
and to the activity that has been undertaken to qualify as a
Competent Person as defined by the 2012 edition of the Australasian
Code for the Reporting of Exploration Results, Mineral Resources
and Ore Reserves (JORC Code) and under the AIM Rules - Note for
Mining and Oil & Gas Companies. Dr. Sener consents to the
inclusion in the report of the matters based on his information in
the form and context in which it appears.
About Ariana Resources:
Ariana is an AIM-listed mineral
exploration and development company with an exceptional
track-record of creating value for its shareholders through its
interests in active mining projects and investments in exploration
companies. Its current interests include gold production in Türkiye
and copper-gold exploration and development projects in Cyprus and
Kosovo.
The Company holds 23.5% interest
in Zenit
Madencilik San. ve Tic. A.S. a joint
venture with Ozaltin Holding A.S. and Proccea Construction Co. in
Türkiye which contains a depleted total of c. 2.2 million ounces
gold equivalent (as at March 2024, using a price ratio of 90 Ag to
1 Au). The joint venture comprises the Kiziltepe Mine and the
Tavsan and Salinbas projects.
The Kiziltepe Gold-Silver
Mine is located in western Türkiye
and contains a depleted JORC Measured, Indicated and Inferred
Resource of 171,700 ounces gold and 3.3 million ounces silver (as
at March 2024). The mine has been in profitable production since
2017 and has been producing at an average rate of c.22,000 ounces
of gold per annum. A Net Smelter Return ("NSR") royalty of 2.5% on
production is being paid to Franco-Nevada Corporation.
The Tavsan Gold
Mine is located in western Türkiye
and contains a JORC Measured, Indicated and Inferred Resource of
311,000 ounces gold and 1.1 million ounces silver (as at March
2024). Following the approval of its Environmental Impact
Assessment and associated permitting, Tavsan is being developed as
the second gold mining operation in Türkiye and is currently in
construction. A NSR royalty of up to 2% on future production is
payable to Sandstorm Gold.
The Salinbas Gold
Project is located in north-eastern
Türkiye and contains a JORC Measured, Indicated and Inferred
Resource of 1.5 million ounces of gold (as at July 2020). It is
located within the multi-million-ounce Artvin Goldfield, which
contains the "Hot Gold Corridor" comprising several significant
gold- copper projects including the 4 million ounce Hot Maden
project, which lies 16km to the south of Salinbas. A NSR royalty of
up to 2% on future production is payable to Eldorado Gold
Corporation.
Ariana owns 100% of
Australia-registered Asgard Metals
Fund ("Asgard"), as part of the
Company's proprietary Project Catalyst Strategy. The Fund is
focused on investments in high-value potential, discovery-stage
mineral exploration companies located across the Eastern Hemisphere
and within easy reach of Ariana's operational hubs in Australia,
Türkiye, UK and Zimbabwe.
Ariana owns 75% of
UK-registered Western Tethyan Resources Ltd ("WTR"), which operates across south-eastern Europe and is
based in Pristina, Republic of Kosovo. The company is targeting its
exploration on major copper-gold deposits across the
porphyry-epithermal transition. WTR is being funded through a
five-year Alliance Agreement with Newmont Mining Corporation
(www.newmont.com) and is separately earning-in to up to 85% of the
Slivova Gold Project.
Ariana owns 61% of
UK-registered Venus Minerals PLC ("Venus")
which is focused on the exploration and development of copper-gold
assets in Cyprus which contain a combined JORC Indicated and
Inferred Resource of 16.6Mt @ 0.45% to 0.80% copper (excluding
additional gold, silver and zinc.
Panmure Gordon (UK) Limited and WH
Ireland Limited are brokers to the Company and Beaumont Cornish
Limited is the Company's Nominated Adviser.
For further information on Ariana,
you are invited to visit the Company's website at
www.arianaresources.com.
Glossary of Technical Terms:
"Au" chemical symbol for
gold;
"DD" Due Diligence;
"g/t" grams per tonne;
"JORC" Joint Ore Reserves
Committee;
"k" thousand
"km" Kilometres;
"m" Metres;
"MRE" Mineral Resource
Estimate;
"M" million
"oz" Troy ounces;
"pXRF" portable XRF;
"t" tonnes;
"Inferred Mineral Resource" is that
part of a Mineral Resource for which quantity and grade (or
quality) are estimated on the basis of limited geological evidence
and sampling. Geological evidence is sufficient to imply but not
verify geological and grade (or quality) continuity. It is based on
exploration, sampling and testing information gathered through
appropriate techniques from locations such as outcrops, trenches,
pits, workings and drill holes. An Inferred Mineral Resource has a
lower level of confidence than that applying to an Indicated
Mineral Resource and must not be converted to an Ore Reserve. It is
reasonably expected that the majority of Inferred Mineral Resources
could be upgraded to Indicated Mineral Resources with continued
exploration.
"Indicated Mineral Resource" is that
part of a Mineral Resource for which quantity, grade (or quality),
densities, shape and physical characteristics are estimated with
sufficient confidence to allow the application of Modifying Factors
in sufficient detail to support mine planning and evaluation of the
economic viability of the deposit. Geological evidence is derived
from adequately detailed and reliable exploration, sampling and
testing gathered through appropriate techniques from locations such
as outcrops, trenches, pits, workings and drill holes, and is
sufficient to assume geological and grade (or quality) continuity
between points of observation where data and samples are gathered.
An Indicated Mineral Resource has a lower level of confidence than
that applying to a Measured Mineral Resource and may only be
converted to a Probable Ore Reserve.
"Measured Mineral Resource" is that
part of a Mineral Resource for which quantity, grade (or quality),
densities, shape, and physical characteristics are estimated with
confidence sufficient to allow the application of Modifying Factors
to support detailed mine planning and final evaluation of the
economic viability of the deposit. Geological evidence is derived
from detailed and reliable exploration, sampling and testing
gathered through appropriate techniques from locations such as
outcrops, trenches, pits, workings and drill holes, and is
sufficient to confirm geological and grade (or quality) continuity
between points of observation where data and samples are gathered.
A Measured Mineral Resource has a higher level of confidence than
that applying to either an Indicated Mineral Resource or an
Inferred Mineral Resource. It may be converted to a Proved Ore
Reserve or under certain circumstances to a Probable Ore
Reserve.
Ends.