Ewoyaa Lithium Resource Increases by a further 42% to 30.1Mt @ 1.26% Li₂O Cape Coast Lithium Portfolio, Ghana, West Africa

SYDNEY, AUSTRALIA / ACCESSWIRE / March 24, 2022 / Atlantic Lithium Limited (AIM:ALL, OTCQX:ALLIF, "Atlantic Lithium" or the "Company"), the fully-funded, African- focussed lithium exploration and development company on track to become West Africa's first lithium producing mine, is pleased to announce a significant Mineral Resource Estimate ("MRE" or the "Resource") upgrade to 30.1Mt at 1.26% Li₂O for the Ewoyaa lithium deposit (collectively the "Ewoyaa Project" or the "Project") within the Cape Coast Lithium Portfolio in Ghana, West Africa. The Resource is reported in accordance with the JORC Code (2012).

Figures and Tables referred to in this release can be viewed in the PDF version available via this link:
http://www.rns-pdf.londonstockexchange.com/rns/8839F_1-2022-3-24.pdf

HIGHLIGHTS:

• 42% increase in MRE to 30.1Mt at 1.26% Li₂O, reported in accordance with the JORC Code (2012) in Indicated and Inferred status at the Ewoyaa deposit.
• Total Resource grade remains largely unchanged, highlighting its robust geological fundamentals, and includes a 294% increase to 20.5Mt at 1.29% Li₂O in the Indicated category and 9.6Mt at 1.19% Li₂O in the Inferred category.
• Mineralisation remains open at depth and along strike with additional untested pegmatites within the immediate deposit area, providing confidence for further resource upgrades.
• The MRE upgrade is based on a total 90,308m of reverse circulation ("RC") and diamond core ("DD") drilling which includes an additional c. 37,500m of drilling completed to end December 2021 (including c. 10,750m of DD).
• Resource expansion and exploration RC drilling underway with one RC drill rig active on site. Regional exploration auger drilling underway with six rigs active over the portfolio; detailed airborne geophysical survey awarded and soil sampling surveys underway over newly granted Cape Coast license (refer RNS of 17 March 2022).
• Significant exploration upside within broader 560km² Cape Coast lithium portfolio, including historic 1.48Mt at 1.67% Li₂O Egyasimanku Hill deposit (non JORC, refer RNS of 14 June 2017).
• Resource exceptionally well located; adjacent high-power transmission lines, within 1km of national highway and within 110km to the operating deep-sea port of Takoradi.
• Resource upgrade expected to significantly improve project economics. Previously announced Scoping Study update (refer RNS of 7 December 2021), based on 21.3Mt at 1.31% Li₂O resource, delivered robust financial outcomes for a 2Mtpa operation, producing an average c. 300,000tpa of 6% Li₂O spodumene concentrate ("SC6") over an 11.4-year operation:
  • Life of Mine ("LOM") revenues exceeding US$3.43bn, Post-tax NPV₈ of US$789m, IRR of 194% over 11.4 years
  • US$70m capital cost with industry-leading payback period of <1 year
  • C1 cash operating costs of US$249 per tonne of 6% lithium spodumene concentrate Free on Board ("FOB") Ghana Port, after by-product credits
  • Pre-tax NPV₈ of US$1.23bn and EBITDA of US$2.02bn for LOM
  • Average EBITDA of US$178m per annum
• Significant potential for further Resource upgrades to extend the planned LOM; Project metrics substantially improve with a LOM of 15 years and beyond.

Commenting on the Company's latest progress, Lennard Kolff, Interim Chief Executive Officer of Atlantic Lithium, said:

"We are delighted to have increased the Ewoyaa Resource by a further 42% to 30.1Mt at 1.26% Li₂O and will continue to grow this robust project with ongoing drilling programs. Our goal was to increase the Resource to support a >12-year mine life and to convert >80% of the previous resource from Inferred to Indicated status. We have comfortably achieved both goals, demonstrating the robust geological fundamentals of the Project.

"With the commencement of additional resource, and exploration drilling along strike and at depth, we are confident of further resource upgrades.

"In conjunction with the ongoing drilling, mining studies in support of the Pre-Feasibility Study are well advanced.

"Due to the coarse nature of the spodumene dominant mineralisation, metallurgical test-work to date has consistently delivered high-purity, low contaminants >6% Li₂O spodumene concentrate utilising dense medium gravity separation, boding well for low capital, operating and carbon intensities.

"The Resource is exceptionally well located, being only 1km from the sealed national highway and 110km from the operating deep-sea port of Takoradi with adjacent grid power; it is challenging to find other lithium pegmatite projects better located.

"Delivery of the upgraded 30.14Mt at 1.26% Li₂O Mineral Resource Estimate including 20.5Mt at 1.29% Li₂O in the Indicated category, is an important de-risking milestone for this industry standout project. With Ewoyaa being fully funded to production through our agreement with Piedmont Lithium, this upgrade highlights the exceptional potential of the project and the value that it brings to the Company."

Mineral Resource Estimate Upgrade

An upgraded MRE of 30.1Mt at 1.26% Li₂O was completed for the Ewoyaa deposit and surrounding pegmatites; collectively termed the "Ewoyaa Project". The Mineral Resource is reported in accordance with the JORC Code (2012). The MRE includes a total of 20.5Mt at 1.29% Li₂O in the Indicated category and 9.6Mt at 1.19% Li₂O in the Inferred category (refer Table 1).

The independent MRE for Ewoyaa was completed by Ashmore Advisory Pty Ltd ("Ashmore") of Perth, Western Australia, with results tabulated in the Statement of Mineral Resources in Table 1. The Statement of Mineral Resources is reported in line with requirements of the JORC Code (2012) and is therefore suitable for public reporting.

High-level Whittle optimisation was completed by Mining Focus Consultants Pty Ltd of Perth, Western Australia and demonstrates reasonable prospects for eventual economic extraction.

There are four main geometallurgical domains at Ewoyaa; coarse-grained type P1 and finer-grained type P2 pegmatites and their weathered equivalents. Their estimated relative abundances, metallurgical recoveries and concentrate grades are shown in Table 2.

To show the tonnage and grade distribution throughout the entire deposit, a bench breakdown has been prepared using a 10m bench height which is shown in Error! Reference source not found. and grade-tonnage curve for the classified resource in Figure 2.

A plan view of the deposit areas is shown in Figure 3 with a long section shown in Figure 4 and cross-section within the Ewoyaa Main indicated category zone shown in Figure 5.

The current MRE is based on a 0.5% reporting cut-off grade (constrained to above the -190mRL), within a 0.4% Li₂O wireframed pegmatite body. However, when assessing all pegmatite volumes (with no cut-offs applied), there is significant scope to increase the resource tonnage. Table 3 below shows the overall resource tonnage and grade for the deposit, inclusive of all pegmatite material. For example, the resource can be reported at a significantly larger tonnage by reducing the cut-off grade to 0.2% Li₂O, giving an increased resource of 39.3Mt at 1.02% Li₂O. Conversely, the resource can be reported at a higher grade using a 0.8% Li₂O cut-off for a resource of 27.8Mt at 1.31% Li₂O.

Further studies will assess the potential benefits of increased production by reducing the cut-off grade or higher feed grade on overall project economics, consistent with market price predictions and price trends realised by existing producers.

Geology and Geological Interpretation

The Ewoyaa Project area lies within the Birimian Supergroup, a Proterozoic volcano-sedimentary basin located in Western Ghana. The Project area is underlain by three forms of metamorphosed schist; mica schist, staurolite schist and garnet schist. Several granitoids intrude the basin metasediments as small plugs. These granitoids range in composition from intermediate granodiorite (often medium-grained) to felsic leucogranites (coarse to pegmatoidal grain size), sometimes in close association with pegmatite veins and bodies.

Pegmatite intrusions generally occur as sub-vertical dykes with two dominant trends: either east-southeast (Abonko, Anokyi, Ewoyaa Northeast, Grasscutter, Kaampakrom and Okwesi) dipping sub-vertically northeast; or north-northeast (Ewoyaa Main) dipping sub-vertically to moderately to the east. Pegmatite thickness varies across the Project, with thinner mineralised units intersected at Abonko and Kaampakrom between 4 and 12m; and thicker units intersected at Ewoyaa Main between 30 and 60m, and up to 100m at surface.

Drill Methods

The database contains data for the auger, RC and DD drilling conducted by the Company since 2018. The drilling was completed by the Company in five phases commencing in April 2018. All the drilling was undertaken by GeoDrill (Ghana), using both RC and DD rigs.

Drilling at the deposit extends to a vertical depth of approximately 319m and the mineralisation was modelled from surface to a depth of approximately 330m below surface. The estimate is based on good quality RC and DD drilling data. Drill hole spacing is predominantly 40m by 40m in the well-drilled portions of the Project and up to 80m by 80m to 100m by 100m across the breadth of the known mineralisation.

The RC drilling used a combination of 5.25' and 5.75' face sampling hammers. The DD used PQ and HQ (85mm and 63.5mm) diameter core barrels. The DD holes were completed from surface or as tails with PQ to maximise recovery in weathered zones, with reversion to HQ once ground conditions improved within fresh material.

In 2018, Phase 1 RC holes were completed on a nominal 100m by 50m grid pattern, targeting the Ewoyaa Main mineralised system. Phases 2 to 5 reduced the wide spacing to 80m by 40m and down to 40m by 40m in the well-drilled portions of the Project. Eleven DD twins of RC holes were completed.

During Phase 1 and 2, RC drilling bulk samples and splits were collected at the rig for every metre interval drilled, the splits being undertaken using a riffle splitter. During Phase 3, Phase 4 and Phase 5, RC samples were split with a rig mounted cone spitter, which took duplicate samples for quality control purposes.

DD was cut with a core saw and selected half core samples totalling 427.1kg was dispatched to Nagrom Laboratory in Australia for preliminary metallurgical test work.

Selected core intervals were cut to quarter core with a saw at one-metre intervals or to geological contacts; and since December 2018, were sent to Intertek Laboratory in Tarkwa, Ghana for sample preparation. Prior to that, samples were sent to SGS Laboratory in Tarkwa for sample preparation.

All Phase 1 samples were submitted to SGS Tarkwa for preparation (PRP100) and subsequently forwarded to SGS Johannesburg and later SGS Vancouver for analysis (ICP90A).

PRP100 - Samples <3kg are dried in trays, crush to 100% passing 2mm, split using a rotary splitter to 5kg and pulverised in a LM2 to a nominal 85% passing 75µm. Approximately 100g sub-sample is taken for assay. All the preparation equipment is flushed with barren material prior to the commencement of the job. Coarse reject material was kept in the original bag.

Since December 2018, samples have been submitted to Intertek Tarkwa (SP02/SP12) for sample preparation. Samples were weighed, dried and crushed to -2mm in a Boyd crusher with an 800-1,200g rotary split, producing a nominal 1,500g split crushed sample, which was subsequently pulverised in a LM2 ring mill. Samples were pulverised to a nominal 85% passing 75µm. All the preparation equipment was flushed with barren material prior to the commencement of the job. Coarse reject material was kept in the original bag. Lab sizing analysis was undertaken on a nominal 1:25 basis. Final pulverised samples (20g) were airfreighted to Intertek in Perth, Australia for assaying.

Sample Analysis Method

Since December 2018, samples were sent to Intertek Laboratory in Perth for analysis (FP6/MS/OES). FP6/MS/OES is an analysis for lithium and a suite of 21 other elements. Detection limits for lithium range between 5ppm and 20,000ppm. The sodium peroxide fusion (in nickel crucibles) is completed with hydrochloric acid to dissolve the sub-sample and is considered a total dissolution. Analysis is conducted by Inductively Coupled Plasma Mass Spectrometry ("ICP-MS").

Prior to December 2018, Phase 1 samples were submitted to SGS Johannesburg and later SGS Vancouver for analysis (ICP90A). ICP90 is a 28-element combination Na₂O₂ fusion with ICP-OES. ICP-MS was added to some submissions for additional trace element characterisation purposes.

Mineral Resource Classification Criteria

The Ewoyaa lithium deposits show good continuity of the main mineralised units which allowed the drill hole intersections to be modelled into coherent, geologically robust domains. Consistency is evident in the thickness of the structure, and the distribution of grade appears to be reasonable along and across strike.

The Ewoyaa Mineral Resource was classified as Indicated and Inferred Mineral Resource based on data quality, sample spacing, and lode continuity. The Indicated Mineral Resource was defined within areas of close spaced RC and DD drilling of less than 40m by 40m, and where the continuity and predictability of the lode positions was good. In addition, Indicated Mineral Resource was confined to the fresh rock. The Inferred Mineral Resource was assigned to transitional material, areas where drill hole spacing was greater than 40m by 40m, where small, isolated pods of mineralisation occur outside the main mineralised zones, and to geologically complex zones.

Estimation Methodology

A Surpac block model was created to encompass the extents of the known mineralisation. The block model was rotated on a bearing of 30°, with block dimensions of 10m NS by 10m EW by 5m vertical with sub-cells of 2.5m by 2.5m by 1.25m. The block size was selected based on results of Kriging Neighbourhood Analysis ("KNA") and also in consideration of two predominant mineralisation orientations of 30° and 100 to 120°.

The parent block size was selected based on KNA, while dimensions in other directions were selected to provide sufficient resolution to the block model in the across-strike and down-dip direction.

Bulk densities ranging between 1.7t/m³ and 2.78t/m³ were assigned in the block model dependent on lithology, mineralisation and weathering. These densities were applied based on 9,725 bulk density measurements conducted by the Company on 65 DD holes and 35 RC holes with diamond tails conducted across the breadth of the Project. The measurements were separated using weathering surfaces, geology and mineralisation solids, with averages assigned in the block model.

Cut-off Grade

The Statement of Mineral Resources has been constrained by the mineralisation solids and reported above a cut-off grade of 0.5% Li₂O. The reporting cut-off grade is supported by a high-level Whittle optimisation.

Mining and Metallurgical Methods and Parameters

The Statement of Mineral Resources has been constrained by the mineralisation solids, reported above the -190mRL and a cut-off grade of 0.5% Li₂O. Whittle optimisations demonstrate reasonable prospects for eventual economic extraction above the -190mRL. Preliminary metallurgical test work indicates four main geometallurgical domains; weathered and fresh coarse-grained spodumene-bearing pegmatite (P1) and weathered and fresh medium-grained spodumene-bearing pegmatite (P2). From test work completed to date at a 6.3mm crush, the P1 material produces a 6 to 6.6% Li₂O concentrate at approximately 70 to 85% recovery (average 75% recovery), whilst P2 material produces 5.5 to 6% Li₂O concentrate at approximately 35 to 65% recovery (average 47% recovery). Further geological, geotechnical, engineering and metallurgical studies are recommended to further define the lithium mineralisation and marketable products.

JORC Table 1, Section 1 (Sampling Techniques and Data) and Section 2 (Reporting of Exploration Results) are included in Appendix 1.

JORC Table 1, Section 3 (Estimation and Reporting of Mineral Resources) is included in Appendix 2.

Competent Persons

Information in this report relating to the exploration results is based on data reviewed by Mr Lennard Kolff (MEcon. Geol., BSc. Hons ARSM), Chief Geologist of the Company. Mr Kolff is a Member of the Australian Institute of Geoscientists who has in excess of 20 years' experience in mineral exploration and is a Qualified Person under the AIM Rules. Mr Kolff consents to the inclusion of the information in the form and context in which it appears.

Information in this report relating to Mineral Resources was compiled by Shaun Searle, a Member of the Australian Institute of Geoscientists. Mr Searle has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity being undertaken 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'. Mr Searle is a director of Ashmore. Ashmore and the Competent Person are independent of the Company and other than being paid fees for services in compiling this report, neither has any financial interest (direct or contingent) in the Company.

Information in this report relating to metallurgical results is based on data reviewed by Mr Noel O'Brien, Director of Trinol Pty Ltd. Mr O'Brien is a Fellow of the Australasian Institute of Mining and Metallurgy (AusIMM) and has sufficient experience which is relevant to the style 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 December 2012 edition of the "Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves" (JORC Code). Mr O'Brien consents to the inclusion in the report of the matters based upon the information in the form and context in which it appears.

This announcement contains inside information for the purposes of Article 7 of the Market Abuse Regulation (EU) 596/2014 as it forms part of UK domestic law by virtue of the European Union (Withdrawal) Act 2018 ("MAR"), and is disclosed in accordance with the Company's obligations under Article 17 of MAR.

For any further information, please contact:

Notes to Editors:

About Atlantic Lithium

www.atlanticlithium.com.au

Atlantic Lithium (formerly "IronRidge Resources") is an AIM-listed lithium company advancing a portfolio of projects in Ghana and Côte d'Ivoire through to production.

The Company's flagship project, the Ewoyaa Project in Ghana, is a significant lithium pegmatite discovery on track to become West Africa's first lithium producing mine. The project is fully funded to production under an agreement with Piedmont Lithium for US$102m and set to produce a premium lithium product. A robust update Scoping Study indicates Life of Mine revenues exceeding US$3.4bn.

Atlantic Lithium holds a 560km² & 774km² tenure across Ghana and Côte d'Ivoire respectively, comprising significantly under-explored, highly prospective licenses.

This information is provided by RNS, the news service of the London Stock Exchange. RNS is approved by the Financial Conduct Authority to act as a Primary Information Provider in the United Kingdom. Terms and conditions relating to the use and distribution of this information may apply. For further information, please contact rns@lseg.com or visit www.rns.com.

SOURCE: Atlantic Lithium Limited