Lithium Ridge Grab Sample Results

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

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)

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

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.

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