KCB – CSAMT breakthrough
25th November 2022
KAVANGO RESOURCES PLC
("Kavango" or "the Company")
KCB - CSAMT breakthrough
Botswana focussed metals exploration company Kavango Resources plc (LSE:KAV) is pleased to announce an important breakthrough in its use of Controlled-Source Audio Magnetotelluric ("CSAMT") surveys as an exploration tool in the Kalahari Copper Belt ("KCB").
Over the last 12 months Kavango has refined and calibrated its use of CSAMT, across its project portfolio. The Company has now completed a programme of CSAMT surveys on KCB prospecting licence PL082/2018 (announced >>> 12 October 2022).
Line 4A is the longest line of CSAMT on PL082/2018 and extended beyond the licence boundary to the southeast, onto ground that hosts the Kronos occurrence (the "Line 4A Survey") with the permission of holder Sandfire Resources (ASX:SFR). As Kronos is known to lie at the D'Kar/Ngwako contact zone, Kavango's objective was to use this occurrence as a calibration point of known geology. The goal is to confirm the D'Kar/Ngwako Pan contact signature in the CSAMT data and then extrapolate this onto PL082/2018. This formational contact is recognised as the primary regional control of copper/silver mineralisation across the KCB.
Initial results of inversions of the CSAMT data from the Line 4A Survey appear to provide high quality vertical resistivity sections that identify sedimentary strata with good resolution, down to 4000m depth. This far exceeds expectations. Previously, at the Company's Kalahari Suture Zone and Ditau projects, Kavango had achieved detailed resolution of sedimentary strata down to roughly 1000m depth. As such, the Company believes it has achieved a significant breakthrough in its proprietary application of CSAMT technology in the KCB.
If drilling demonstrates that Kavango can accurately map the D'Kar/Ngwako Pan contact from surface, using CSAMT, the Company believes this should substantially enhance its exploration programme in the KCB.
Further updates will be made, as Kavango interprets and analyses inversions of data taken from the lines 3, 4A, 6A and 8 surveys. The Company intends to use these results to calibrate its future use of CSAMT and enhance the ongoing drill programme on licence PL082/2018, which is targeting copper/silver mineralisation.
Jeremy S. Brett, Senior Geophysicist at Kavango Resources, commented:
"CSAMT applied to the Kalahari Copper Belt is showing impressive promise as a geophysical tool to detect the primary bedding and secondary brittle controls that are well known to control mineralization in the belt.
This method provides the detection of structure in vertical section and meshes well with the regional folding and faulting that can be interpreted very well from aeromagnetic surveys.
The combination appears to be very powerful for exploration targeting, and Kavango hopes to prove this via diamond drilling."
Further information in respect of the Company 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
First Equity (Joint Broker)
+44 207 374 2212
SI Capital Limited (Joint Broker)
+44 1483 413500
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.
NOTES TO EDITORS
KAVANGO'S INTERESTS IN THE KALAHARI COPPER BELT
Kavango's exploration licences in the KCB include:
Agreement to acquire 100% working interest (Kavango currently owns 50% working interest) in 10 prospecting licences held in a Joint Venture vehicle (Kanye Resources) with Power Metal Resources (LSE:POW), which cover 4,256km2. Terms of the acquisition, which is subject to the issue of a prospectus by Kavango, are provided in the announcement dated 8 July 2022.
The LVR Project
Earning in a 90% interest in prospecting licences PL082/2018 & PL 083/2018, held in a Joint Venture with LVR GeoExplorers (Pty) Ltd ("LVR"), which cover 809km2.
THE KCB PROJECT GEOLOGICAL SETTING
Redox boundaries were formed several hundred million years ago in active sedimentary basins flooded by shallow seas. Organic matter accumulating on the sea floor created anoxic conditions, which formed a chemical barrier to metal ions rising upwards through the sediments as the basin subsided. The change in chemistry caused the precipitation of metal species (carbonates, sulphides etc.) including copper and silver on or just below the redox boundary.
Subsequent tectonic activity folded the sedimentary layers, which was often accompanied by the concentration of metals into the fold hinges and shear zones. Fold hinges pointing upwards are known as anticlines, while the downward pointing hinges are called synclines.
Several large copper/silver ore deposits have been discovered on the KCB in association with anticlines in areas now held under licence by Sandfire Resources (ASX:SFR) and Cupric Canyon (a privately owned mining development company). These deposits are relatively close to surface and many are amenable to open pit mining operations.
Accumulations of metals can be traced along the strike of redox boundaries (sometimes for many kilometres) because they often contain iron and have a higher magnetic signature than the surrounding rock. These have recently been successfully mapped by Kavango's exploration teams.
AEM: Airborne Electromagnetic Survey. This uses an energised loop to induce currents in underlying lithological units, which resultant magnetic field can then be measured.
CSAMT: Abbreviated from Controlled Source Audio frequency Magneto Telluric. An AMT survey is an electromagnetic survey technique that uses naturally occurring passive energy sources, and which can electromagnetically map geological structures to depths of 500 metres or more.
Inversion: Geophysical inversion refers to mathematical and statistical techniques for recovering information on subsurface physical properties, from measured geophysical data
KCB: Kalahari Copper Belt. An area of southern Africa, running ENE-WSW from Botswana into Namibia, within which multiple economic copper-silver sedimentary rock hosted deposits have been discovered.
RC: Reverse Circulation drilling. This is a cost-effective method of drilling that uses compressed air to drive a downhole hammer, which breaks rock into chips that are forced up an internal tube in the drill rod, minimising risk of contamination by wall-rock.
Redox boundary: Reduction and oxidation boundary, at which the chemical oxidative state of chemical species changes, typically resulting in precipitation of metal salts.