Lithium Ridge Grab Sample Results

Andrada Mining Limited

28 July 2026

 

The information contained within this announcement is deemed by the Company to constitute inside information as stipulated under the Market Abuse Regulations (EU) no. 596/2014 (MAR) as in force in the United Kingdom pursuant to the European Union (withdrawal) Act 2018. Upon the publication of this announcement via Regulatory Information Service (RIS), this inside information will be in the public domain.

Andrada Mining Limited

("Andrada" or the "Company")

Lithium Ridge Mineralised Trend Extended By 50% to 9km

Andrada Mining Limited (AIM: ATM, OTCQB: ATMTF), a tin producer with a portfolio of critical mineral assets in Namibia, is pleased to announce the final grab sample results from the Lithium Ridge Project ("Lithium Ridge" or the "Project"). The sampling programme has been undertaken in accordance with Stage 1 of an earn-in agreement in partnership with Sociedad Química y Minera de Chile SA through its subsidiary SQM Australia (Pty) Ltd ("SQM").

The results have extended the surface mineralisation of lithium ridge by 50% to a total of nine kilometres. The results also identified high grade lithium, tin and tantalum anomalies within multiple new pegmatites across the licence area. This builds on the initial results which confirmed the presence of mineralisation along the primary Lithium Ridge trendline as disclosed in January 2026. See announcement dated 26 January 2026.

HIGHLIGHTS

•	Significant surface lithium grades: multiple grab samples returned grades exceeding 3.5% Li2O with associated tin and tantalum anomalies indicated.
•	Expanded mineralised system: high-grade lithium samples extended the mineralised strike of the main Lithium Ridge trend from six to nine kilometres.
•	Additional targets identified: The results identified multiple mineralised new pegmatites beyond the primary mineralised trend, containing high grades of lithium and associated minerals.
•	Polymetallic upside: Grab samples consistently returned high-grade tin (Sn) and tantalum (Ta) with grades up to 7.38 % Sn and 3 192 ppm Ta.

Anthony Viljoen, Chief Executive Officer, commented:

"The completion of the licence-wide surface sampling programme marks another important milestone in our evaluation of Lithium Ridge. The results extend the identified mineralised trend by an additional three kilometres and confirm high-grade lithium mineralisation across multiple new pegmatites, together with significant associated tin and tantalum mineralisation. These results complement the encouraging diamond drilling results reported to date, which have demonstrated lithium mineralisation from surface to borehole depth and have strengthened our understanding of the scale and continuity of the broader pegmatite system. The identification of additional mineralised pegmatites beyond the principal trend further highlights the exploration potential that remains across the licence area."

RESULTS OVERVIEW

In the third quarter of the 2025 calendar year, Andrada commenced a licence-wide geological mapping and grab sampling programme (the "Programme") as part of the Stage 1 earn-in agreement with SQM to identify additional mineralised pegmatites within the Lithium Ridge mining licence. The Programme identified approximately 1,500 outcropping pegmatites through satellite and aerial imagery from which a total of 1,230 grab samples were collected. The initial results for 496 samples were reported on 26 January 2026, and the results for the remaining 734 samples are disclosed in this announcement.

The samples were selected for analysis based on field identification of visible spodumene or other indicator minerals. Additional samples where no visible lithium minerals were identified, were systematically selected to investigate mineralisation that may not have been apparent during mapping and sampling. These samples will build a geochemical database of the pegmatites across the project area. These new results contained 60 samples that recorded lithium grades above 1% Li₂O, including 48 with values above 2% Li₂O. These high-grade samples originated from multiple pegmatites across the license area, demonstrating the potential scale of the mineralised system and potential for additional mineral discoveries as the project advances.

All the analysed samples were exclusively collected from pegmatites, and no samples of the surrounding host rock were selected for analysis. While visual identification, supported by Raman Spectroscopy, indicated spodumene as the primary lithium mineral, two samples from a single pegmatite returned grades with Li₂O values exceeding 8% and also contained elevated phosphorous levels. The samples that returned significant lithium grades during field identification were used to select the pegmatites for diamond drilling, which took place at the same time as the surface sampling.

In addition to the significant lithium grades recorded, numerous samples contained significant tin and tantalum mineralisation, with 160 samples reporting grades above 0.1% Sn and 163 samples reporting grades above 75 ppm Ta. Most of these high-grade tin and tantalum samples were obtained from pegmatites which also contained significant lithium grades, further underscoring the polymetallic potential of Lithium Ridge.

Table 1: Selected high grade lithium grab samples (Coordinate system: UTM33 South)

Sample Number	Easting	Northing	Li2O (%)	Sn (%)	Ta (ppm)
NN07785	509351	7632332	14.72	0.12	229
NN07786	509351	7632332	13.77	0.01	215
NN07697	509876	7631023	4.99	0.03	56
NN08369	508796	7629216	4.94	0.04	11
NN07777	506359	7627918	4.31	0.06	13
NN07708	512361	7632071	4.20	0.02	8
NN07748	505783	7627974	4.10	0.02	39
NN07707	512345	7632067	4.05	0.01	10
NN07774	506244	7627823	4.01	0.02	22
NN07771	506056	7627785	3.85	0.04	124
NN07908	505157	7627884	3.85	0.04	9
NN07961	506034	7629704	3.77	0.06	41
NN08121	509946	7630018	3.76	0.01	14
NN07830	505520	7627846	3.75	0.04	7
NN07954	507428	7630413	3.70	0.01	901
NN07706	512330	7632054	3.65	0.03	23
NN08390	509397	7629622	3.58	0.01	12
NN07758	505844	7627993	3.58	0.03	98
NN07779	506278	7627966	3.56	0.08	34
NN07776	506308	7627881	3.47	0.06	13
NN08122	509925	7630017	3.46	0.01	8

Table 2: Selected high-grade tin and tantalum grab samples (Coordinate system: UTM33 South).

Sample Number	Easting	Northing	Li2O (%)	Sn (%)	Ta (ppm)
NN07989	504225	7627677	0.07	7.38	1222
NN08032	504026	7627505	0.02	2.89	534
NN07809	505229	7628100	0.02	1.93	354
NN07739	510509	7631308	0.02	1.70	937
NN08388	508761	7629346	0.02	1.50	196
NN07102	507829	7628489	0.01	1.38	168
NN07976	504534	7628366	0.01	1.29	331
NN07793	509401	7632324	0.03	1.11	286
NN07916	504928	7627607	0.03	1.01	84
NN08113	504342	7627006	0.16	1.01	324
NN07744	509491	7630361	0.05	0.30	933
NN07710	512662	7632210	0.03	0.15	1435
NN07801	509794	7630902	0.14	0.10	1034
NN07746	509260	7630505	0.02	0.10	1110
NN07947	505128	7627386	0.10	0.06	3192
NN07741	508648	7630548	0.09	0.02	920
NN07954	507428	7630413	3.70	0.01	901
NN07995	503204	7627967	0.02	0.01	932

The grab samples were collected by qualified mapping teams with the location of each sample recorded using handheld GPS devices. The samples were submitted in their entirety to SA Labs Ithuba for pulverisation and homogenisation, with the pulps subsequently dispatched to UIS Analytical Services for geochemical analysis which are independently certified laboratories. A sodium peroxide fusion coupled with ICP-OES analysis were used to determine Li and other major element abundances, while lithium borate fusion and ICP-MS analysis were performed to obtain Sn, Ta and other minor or trace element abundances. Internal laboratory Quality Assurance and Quality Control standards were reported to Andrada and were found to be compliant as well as  to provide the appropriate level of confidence in the grades of the grab samples.

Figure 1: Li₂O values of pegmatite grab samples reported on Lithium Ridge.

Figure 2: Sn values of pegmatite grab samples reported on Lithium Ridge.

The Stage 1 drill programme, comprising approximately 16,500 metres of orientated diamond drilling, was completed in May 2026 and targeted most of the mineralised pegmatites identified by the mapping and grab sampling programmes. Samples from the drilling are currently being dispatched for analysis and the Company will continue to provide updates on the drilling results as they are received. In addition to assisting with drill targeting, the grab samples will provide critical information on the geochemistry of the pegmatite suites present on the licence area and will be integrated with the results of the Programme to inform the mineral system model for the Project.

COMPETENT PERSON STATEMENT

The technical data in this announcement has been reviewed by Professor Laurence Robb ("Prof. Robb"), who is a non-executive director of Andrada. Prof. Robb has over 30 years industry related exploration and economic geology experience and is a Competent Person for the reporting of exploration results. He has reviewed both the technical disclosures in this release as well as the quality assurance protocols (QA/QC) and results for this programme.

GLOSSARY OF ABBREVIATIONS

ICP-MS	Inductively Coupled Plasma-Mass Spectrometry
ICP-OES	Inductively Coupled Plasma-Optical Emission Spectrometry
Li	Symbol for Lithium
Li → Li₂O	Metal to metal-oxide conversion factor of 2.153
Li₂O	Lithium oxide
PPM	Parts Per Million
QA/QC	Quality Assurance / Quality Control
Sn	Symbol for Tin
Ta	Symbol for Tantalum

CONTACTS Andrada Mining Limited Anthony Viljoen, CEO Sakhile Ndlovu, Head of Investor Relations	[phone]
NOMINATED ADVISOR & BROKER
Zeus Capital Limited Katy Mitchell Andrew de Andrade Harry Ansell	[phone]
CORPORATE BROKER & ADVISOR
H&P Advisory Limited Andrew Chubb Matt Hasson	[phone]
VSA Capital   Andrew Monk   Brian Wong	[phone]
FINANCIAL PUBLIC RELATIONS
Tavistock Emily Moss Josephine Clerkin	[phone] [e-mail]

About Andrada Mining Limited

Andrada Mining Limited, listed on the London Stock Exchange's AIM market, is a tin producer with a portfolio of critical minerals mining and exploration assets in Namibia, a premier investment destination in Africa. The Company's strategy focuses on unlocking Namibia's abundant mineral resources via best-in-class strategic partnerships across its resource base, enhancing the country's reputation as a leading global hub for African critical mineral investment. Andrada is actively scaling up tin production alongside lithium, tantalum, tungsten and copper, steadily broadening its operational footprint and output. The Company aims to supply critical raw materials from its extensive resource portfolio to support a sustainable future, improve quality of life, and uplift communities near its operations. These critical metals play a crucial role in the green energy transition, serving as essential components for electric vehicles, solar panels, and wind turbines.

 

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