Lithium Ridge Grab Sample Results
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
+27 (11) 268 6555
NOMINATED ADVISOR & BROKER
Zeus Capital Limited
Katy Mitchell
Andrew de Andrade
Harry Ansell
+44 (0) 20 2382 9500
CORPORATE BROKER & ADVISOR
H&P Advisory Limited
Andrew Chubb
Matt Hasson
+44 (0) 20 7907 8500
VSA Capital
Andrew Monk
Brian Wong
+44 (0) 20 3005 5000
FINANCIAL PUBLIC RELATIONS
Tavistock
Emily Moss
Josephine Clerkin
+44 (0) 207 920 3150
andrada@tavistock.co.uk
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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