Positive Tungsten Test Results At Brandberg West

Andrada Mining Limited

13 April 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")

Positive Initial Tungsten Test Results At Brandberg West 

Andrada Mining Limited (AIM: ATM, OTCQB: ATMTF), a tin producer with a portfolio of critical minerals mining and exploration assets in Namibia, is pleased to announce the initial results of its ore sorting testwork undertaken at the Brandberg West project ("BW" or the "Project") The initial testwork forms part of a multi-phased assessment programme at BW, that includes evaluating the tailings and waste material from the historical mine, and an exploration drilling programme.

HIGHLIGHTS

§ Grade uplift: across all nine samples with significant grade increases from the feed to the concentrate because of ore-sorting;

−   Tungsten: grade increased from 0.24% to 1.45% (Sample A5).

−   Copper: grade increased from 0.73% to 2.81% (Sample A7).

−   Tin: grade increased from 0.31% to 2.09% (Sample A8).

§ High metal recoveries of tungsten and tin: tungsten recoveries up to 91% and tin recoveries of up to 94%.

§ 90% mass reduction: highlighting possible lower capex and accelerated route to production.

§ Validation of polymetallic efficiency: the sensor-based (XRT) ore sorting technology, demonstrated the ability to effectively identify and separate multiple target elements simultaneously, confirming the potential to produce a high-value polymetallic concentrate.

Anthony Viljoen, Chief Executive Officer, commented:

"These results represent an important validation milestone in highlighting the economic potential of tungsten as a key critical metal at the Brandberg West project, particularly against a backdrop of exceptionally strong commodity prices. The grades achieved in this testwork on the historically mined waste dumps are significantly higher than the global average for tungsten deposits with corresponding high recovery rates. This outcome reinforces our confidence as we advance toward larger-scale test batches and firmly positions tungsten as a cornerstone critical metal within Andrada's overall portfolio."

Overview of results

The Brandberg West Mine, located on EL5445, has historically been recognised for its significant tin, tungsten, and copper mineralisation. This initial testing programme focused on nine grab samples (A1 to A9) collected from various locations within the historical mining area. The samples were derived from previously blasted or waste material and, represent the diverse mineralisation styles at BW. The results from these grab samples validate the inclusion of the discard and waste areas in this phase of the Agreement as it may accelerate the production timeline since the material is readily available at surface in large volumes.

Technical Summary

Each of the grab samples weighed approximately 30kg and comprised loose material found at each of the sample locations as shown below in Figure 1. Concentrate and discard streams were analysed at UIS Analytical Services, a certified independent laboratory. A sodium peroxide fusion coupled with ICP-OES analysis was used to determine the element concentrations. Due to the coarse nature of the mineralisation, together with the effects of weathering and inherent variability within surface material, the samples are not representative of the average grade at each location. Although every attempt was made to collect samples to reflect variability across the areas tested, the sample mass was too low for representativity. Bulk testwork has been planned to provide a more representative assessment of the material types.

By utilising XRT sorting at the TOMRA facilities, the Company was able to identify and isolate the mineralised fractions from the waste material with a high degree of precision. The results demonstrate that the mineralisation at Brandberg West is highly amenable to sensor-based sorting technology. The process consistently reduced the total mass by 90%, which could lead to lower transportation and milling costs. Importantly, the grades achieved in this initial programme are comparable to those observed in primary mineralisation within the quartz veins, supporting the potential to extract value from historical waste streams. Furthermore, these initial results have recorded tin and tungsten recoveries above 80% in multiple instances, and where the recoveries are reduced, an upgrade multiple is still achieved. As larger samples are processed, providing greater training datasets, we believe the recoveries will continue to increase and become more consistent.

The testwork is being advanced under the staged earn-in agreement (the "Agreement") with ACAM LP's affiliate BWCAM Limited ("BWCAM"). Under the Agreement, BWCAM could provide up to USD51 million funding to accelerate the exploration and development of BW polymetallic prospecting licence and up to 49% ownership of the project. The current phase of the Agreement aims to evaluate all the historical discard streams (waste, plant discard and tailings) as well as hard rock material within the existing pit.  (See announcements released on 21 January 2026 and 4 February 2026).

Figure 1: Map of sample locations

Table 1: Results of the XRT ore sorting test from nine (9) grab samples taken from the historical Brandberg West min.

SAMPLE NUMBER			A1	A2	A3	A4	A5	A6	A7	A8	A9		Average
TIN	Feed grade (%)		0.18	0.11	0.05	0.12	0.19	0.17	0.14	0.31	0.10		0.15
	Concentrate grade (%)		1.49	1.25	0.66	0.89	1.14	1.23	0.74	2.09	0.41		1.10
	Rejects grade (%)		0.04	0.03	0.02	0.05	0.03	0.03	0.06	0.02	0.04		0.04
	Recovery (%)		81	77	68	57	86	58	64	94	64		72
	Upgrade multiple		8	11	13	8	6	7	5	7	4		8
TUNGSTEN	Feed grade (%)		0.04	0.07	0.18	0.09	0.24	0.17	0.16	0.14	0.17		0.14
	Concentrate grade (%)		0.13	0.83	1.74	1.02	1.45	1.39	1.13	0.65	0.87		1.02
	Rejects grade (%)		0.03	0.02	0.10	0.01	0.04	0.02	0.02	0.05	0.03		0.04
	Recovery (%)		34	78	49	85	87	91	87	67	83		74
	Upgrade multiple		4	11	10	11	6	8	7	5	5		7
COPPER	Feed grade (%)		0.25	0.12	0.10	0.11	0.32	0.20	0.73	0.53	0.31		0.30
	Concentrate grade (%)		1.15	0.47	0.67	0.49	1.31	0.64	2.81	2.05	1.04		1.18
	Rejects grade (%)		0.16	0.09	0.07	0.08	0.15	0.14	0.44	0.29	0.17		0.18
	Recovery (%)		44	28	33	33	60	37	47	54	54		43
	Upgrade multiple		5	4	7	5	4	3	4	4	3		4

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 and terms

%	Symbol for percentage
Cu	Symbol for Copper
ICP-OES	Inductively Coupled Plasma-Optical Emission Spectrometry
Mass reduction	The percentage of feed material rejected as waste during the sorting process
Ore sorting	A sensor-based, physical separation technology used to analyse and separate individual particles or bulk material based on physical, chemical, or radiometric properties.
Recovery	The percentage of the total metal content contained in the feed that is successfully captured in the concentrate.
Sighter test	An early-stage, preliminary test conducted on a small number of samples to assess whether a particular processing method or technology is viable for a given ore or material.
Sn	Symbol for tin
Upgrade multiple	The factor by which the metal grade is increased from the initial feed to the final concentrate.
W	Symbol for tungsten
XRT	X-ray transmission technology used to categorise materials based on their atomic density

CONTACT
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 Jay Ashfield Matt Hasson	[phone]
Berenberg Jennifer Lee	[phone]
FINANCIAL PUBLIC RELATIONS
Tavistock (United Kingdom) 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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