REG - Kavango Resources - BOTS – Preliminary KCB Heliborne Geophysics Interp

Kavango ResourcesAnnouncement

02/04/2024 07:00

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RNS Number : 9107I  Kavango Resources PLC  02 April 2024

02 April 2024

Kavango Resources

("Kavango" or "the Company")

BOTS - Preliminary KCB Heliborne Geophysics Interpretation

Kavango Resources plc (LSE: KAV), the Southern Africa focussed metals
exploration company, is pleased to announce preliminary interpretation for
geophysical survey data on its property in Botswana's Kalahari Copper Belt
("KCB"), from South Africa based New Resolution Geophysics ("NRG").

Highlights

·    Helicopter-borne gravity has clearly defined a WSW-ENE trending ~9
milliGal gravity high (Kara) underlying the Kara Anticline.

·    The Kara gravity high is one of two linear features in the regional
gravity (Kara & Tsootsha gravity highs) possibly linked to the Okwa
Complex, that may indicate the presence of basement highs defining multiple
edges between two deeper basins, one to the south (Ncojane Basin) the other to
the northeast (Ghanzi Basin) with a sub-basin to the north (Talismanis Basin).

·    Basin margins along the KCB are considered prospective sites for
Cu-Ag mineralisation.

·    Preliminary interpretation of magnetic data from this survey combined
with re-processed regional magnetic data and satellite images, clearly define
fold hinge targets in the D'Kar Formation (DKF) that correlate with
preliminary AEM targets. Fold hinges are associated with mineralisation
elsewhere on the KCB, such as at Sandfire Resources' (ASX:SFR) Motheo Mine

·    The updated geological interpretation is supported by recent regional
mapping traverses that identified sub-cropping units within the lower D'Kar
Formation, the target stratigraphic unit for mineralisation.

·    Historic drilling by ENRG, from whom Kavango in 2023 acquired a 90%
interest in 6 licences, confirms the existence of lower DKF in the fold
structures recently mapped and noted pathfinder minerals, pyrite, sphalerite,
and galena.

Ben Turney, Chief Executive Officer of Kavango Resources, commented:

"Based on its analysis of regional copper-silver deposits in the KCB, Kavango
believes the configuration of basin and sub-basin structures, including basin
margins and intra-basinal highs, plays a pivotal role in many sedimentary
copper models.

We're quietly confident our Kalahari Copper Belt exploration programme is
going to deliver.

The different exploration data sets we've gathered appears to point in the
same direction, namely that our ground covers the style of large-scale system
that could host significant copper-silver deposits.

We are now defining final target areas to test with ground geophysics and then
drilling a little later this quarter.

This is great work from the Kavango team. Thank you all."

Preliminary Gravity, Magnetic and AEM interpretation

The NRG geophysical survey covered 2,374 line-km of helicopter heliborne Time
Domain Electromagnetic ("EM"), Magnetic, and Gravity data (announced
>>> 22 March 2024
(https://polaris.brighterir.com/public/kavango_resources_plc/news/rns/story/rdljd8x)
)

The majority of sediment hosted deposits are found in failed rift and passive
margin settings, and it is generally agreed that basin-scale hydrothermal
circulation is required to scavenge sufficient metals to form large deposits
(Hoggard et.al. 2020). The configuration of basin and sub-basin structures,
including basin margins and intra-basinal highs, plays a pivotal role in many
sedimentary copper models. Faults along these boundaries frequently serve as
pathways for fluids during basin formation and conduits for mineralising
hydrothermal fluids during subsequent deformation and inversion (with
localised dome formation). The intracratonic setting of these basins allowed
the development of a hydrologically closed basinal architecture in which
highly oxidized and saline, moderate-temperature basinal brines were produced
that were capable of supplying reduction-controlled sulfide precipitation over
very long time periods, (Hitzman et.al 2010). Sub-basins, in particular,
create restricted systems conducive to concentrated fluid flow, oftentimes
enhancing the metal content of potential deposits,

Heliborne gravity data offers an additional approach to delineating original
basin architecture. The density contrast in the geological profile, between
the dense Okwa Group Basement Complex and the less dense Kgwebe and Ghanzi
Group volcano-sedimentary sequence, enables the identification of large,
deeper basins and smaller restricted sub-basins as gravity lows. Basin margins
are common settings for the formation of sedimentary copper deposits.

The NRG gravity data, when viewed together with the regional gravity data,
appears to indicate the presence of two linear features, possibly linked to
the Okwa Complex, trending NNW-SSE (Tsootsha) and WNW-ENE (Kara) that may
indicate the presence of basement highs defining edges between two deeper
basins to the south (Ncojane Basin) and northeast (Ghanzi Basin). During
inversion basin margin structures frequently form conduits for mineralising
hydrothermal fluids and form ideal locations for deposit formation, (Figure 1
& 2).

The data also indicates a possible restricted sub-basin to the north
(Talismanis). Sub-basin margins are identified as priority locations for
deposit formation, due to enhancement of metal content in the fluids.

Interpretation of re-processed regional government airborne magnetics together
with detailed geological mapping have identified thrusts, that appear to be
bounding faults for the gravity high, possibly marking original basin
structures, Figure 2.

Regional folding interpreted from aeromagnetic data and geological mapping
have also identified doubly plunging domal structures, at a regional and local
scale. The gravity data may also be emphasising these same domal features. The
domes appear to be separated by zones of more concentrated faulting, shearing
and local fracturing, (Figures 2 & 3).

Figure 1, NRG Bouguer gravity images with Kavango licences overlain on
regional satellite Bouguer gravity data. Exploration targets and deposits
together with their respective resources (data sourced from company web
sites). Most deposits and exploration targets on the KCB appear to be
associated with basin and sub-basin margins and bounding structures.

Figure 2, NRG bouguer gravity images overlain on regional geology with
magnetic 1VD image. Doubly plunging folds (domes) can been seen in the
regional geology and locally in the gravity data within the Kara Antiform.
Major thrusts appear to form bounding faults on either side of the gravity
high.

Recent field mapping has identified a number of tight, upright folds
corroborated in magnetic data, which present potential trap-sites for
deposition of copper-silver mineralisation. These folds are typically bounded
by district scale thrusts and major shears, possibly providing the necessary
conduits for movement of copper-rich fluids during basin formation and
subsequent closure and basin inversion (dome formation), Figures 3 & 4.

Promising targets identified as tight folds in the DKF, resembling Sandfire
Resources' Motheo Mine and A4 deposits directly along strike, are evident in
satellite imagery, magnetic data and correlate with interpreted AEM
conductors, (Figure 5).

Figure 3, Sentinel 2B 16bit_20231020_0000000_2500mm_multispectral image over
Karakubis area, clearly showing well defined fold patterns.

Figure 4, NRG RTP High Pass Filter images overlain on regional geology with
magnetic 1VD. The northern and southern limbs of the Kara Antiform define the
upper and middle D'Kar sequences with the lower D'Kar underlying the core of
the fold. Local shears and faults cause dislocations in the stratigraphy
forming potential trap sites for mineralisation.

Figure 5, LANDSAT 9 16bit_20231019_0000000_15m_multispectral image over
Sandfire Motheo Mine (pink dot) & A4 (yellow dot [can't see the yellow
dot]), showing similar fold patterns to the SW of the mine to those observed
and mapped at Karakubis.

Preliminary AEM data also maps out the regional scale fold structures while
also defining blocks with different resistivity and conductivity contrasts on
either side of shears and faults.

Figure 6, NRG AEM image overlain on regional geology with aeromagnetic 1VD
shading. The northern and southern limbs of the Kara Antiform can be seen
closing around and plunging towards the southwest. A large shear trending
SW-NE in the centre of the Antiform appears to separate blocks of contrasting
resistivity and conductivity.

Inversions for the historical ENRG AEM data have just been received and
inversions on the new Kavango AEM data are being processed.  These will be
merged and will supply a single set of uniformly sourced inversions across the
new contiguous licence block, which will be interpreted for target areas for
ground geophysical follow-up.  Specific targets will then be picked for
drilling.

 

Further information in respect of Kavango and its business interests is
provided on the Company's website at www.kavangoresources.com and on Twitter
at #KAV.

For further information please contact:

Kavango Resources plc

Ben Turney

+46 7697 406 06

First Equity (Broker)

Jason Robertson

+44 207 374 2212

Kavango Competent Person Statement

The technical information contained in this announcement pertaining to geology
and exploration have been read and approved by Brett Grist BSc(Hons) FAusIMM
(CP). Mr Grist is a Fellow of the Australasian Institute of Mining and
Metallurgy with Chartered Professional status. Mr Grist has sufficient
experience that is relevant to the exploration programmes and geology of the
main styles of mineralisation and deposit types under consideration to act as
a Qualified Person as defined in the 2012 Edition of the 'Australasian Code
for Reporting of Exploration Results, Mineral Resources and Ore Reserves';.

The technical information contained in this announcement pertaining to
geophysics have been read and approved by Mr. Jeremy S. Brett, M.Sc., P.Geo.,
Senior Geophysical Consultant, Jeremy S. Brett International Consulting Ltd.
in Toronto, Canada.  Mr. Brett is a member of the Professional Geoscientists
of Ontario, the Prospectors and Developers Association of Canada, the Canadian
Exploration Geophysical Society, and the Society of Economic Geologists.  Mr.
Brett has sufficient experience that is relevant to geophysics applied to the
styles of mineralization and types of deposits under consideration to act as
a Qualified Person as defined under the Canadian National Instrument 43-101,
Standards of Disclosure for Mineral Projects.

References

https://doi.org/10.2113/gsecongeo.105.3.627

https://doi.org/10.1038/s41561-020-0593-2

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