TIDMATM
RNS Number : 6996V
Andrada Mining Limited
05 December 2023
5 December 2023
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 is now
considered to be in the public domain.
Andrada Mining Limited
("Andrada" or the "Company")
HIGH-GRADE SPODUMENE CONCENTRATE PRODUCED FROM LITHIUM RIDGE
Andrada Mining Limited (AIM: ATM), an African technology metals
mining company with a portfolio of mining and exploration assets in
Namibia, announces that it has produced high-grade lithium
spodumene concentrate from mineralised pegmatite material sourced
from the Lithium Ridge licence area (ML133).
HIGHLIGHTS
-- High-grade spodumene concentrate, at a grade of 6.8% Li(2) O
(75% spodumene), produced from two Lithium Ridge exploration
samples through laboratory-scale flotation.
-- The two samples are composites of drill hole chips, each
sourced from a different pegmatite body.
-- The flotation test work achieved a Li(2) O recovery of 76%
(80% spodumene recovery).
-- Further exploration drilling is planned for metallurgical
test work and mineralogical characterisation to investigate the
extent of spodumene mineralisation in the Lithium Ridge licence
area.
Anthony Viljoen (CEO) commented
"These results confirm recoverable spodumene within the
pegmatites of the Lithium Ridge licence area. The test work
produced battery-grade spodumene concentrate at very attractive
lithium recoveries. This follows the conclusion of a first phase of
exploration drilling on Lithium Ridge which yielded exceptional
results as announced on 6 September 2023. Several notable drilling
intersections of up to 2.13% Li O were reported, and the drilling
demonstrated lithium mineralisation along a 6km strike.
The lithium mineralisation in the pegmatites of Lithium Ridge
varies from spodumene-dominant to petalite-dominant. In the area of
the licence where the composite samples were sourced, the mineral
abundance map (Figure 3) shows a high proportion of spodumene and
very little petalite. However, southwest of the licence area,
displays a high grade of petalite with minor spodumene
mineralisation. The southwest area is the source of ore for the
current production of ceramic-grade petalite concentrate for
Andrada's lithium pilot plant.
Therefore, based on these results, we will proceed with the next
phase of exploration drilling, metallurgical test work and
mineralogical characterisation. This will increase geological and
metallurgical confidence as well as establish a maiden mineral
resource estimate over Lithium Ridge. We are encouraged by the
progress towards our strategy of building a large-scale lithium
production base."
TEST WORK RESULTS
Metallurgical test work on the two samples selected from
exploration drill chips produced during reverse circulation
drilling, was conducted by Geolabs Global, a South African provider
of mineral processing solutions. The aim of the test was to
investigate lithium mineral composition and recovery potential in
an area of the Lithium Ridge licence where significant spodumene
occurrence was observed during exploration. The samples are
composites of drill chips, and each sample was sourced from a
different pegmatite body as illustrated on Figure 3 and Figure 5
below. The samples yielded a weighted average feed grade of 1.69%
Li(2) O and 15.2% spodumene as detailed in Table 1.
Table 1 : Sources and lithium/spodumene feed grades of the
composite samples.
Sample Source (Figure 3) Drill Hole Numbers Li O (%) Spodumene (%)
Composite 1 Pegmatite Body 1 ATNN23 2.03% 16.2%
------------------- -------------------- --------- --------------
Composite 2 Pegmatite Body 2 ATNN 17, ATNN 18 1.38% 14.2%
------------------- -------------------- --------- --------------
Average 1.69% 15.2%
--------- --------------
The samples were subjected to a standard 5-stage spodumene
flotation process to assess the potential recovery steps (Figure
1). Initial de-sliming at 25 u m and removal of the mica through
flotation were followed by a spodumene rougher flotation stage and
three cleaner flotation stages.
Figure 1 : Test workflow diagram
The two tests produced a weighted average concentrate grade of
6.8% Li(2) O or 75% spodumene, at a weighted average recovery by
flotation of 76% Li(2) O or 80% spodumene. The grade-recovery curve
for each composite sample is shown in Figure 2.
Figure 2 : Li(2) O grade-recovery curves for each composite
sample.
The full assay results are tabulated below, confirming the
potential for the production of a battery-grade spodumene
concentrate.
Table 2 : Assays from final flotation concentrate products.
Sample Li SiO Al Fe TiO CaO MgO K MnO P
O (%) (%) O (%) O (%) (%) (%) (%) O (%) (%) O (%)
Composite 1 7.00 50.48 26.52 1.00 0.08 0.25 0.2 0.27 0.14 3.77
------ ----- ------ ------ ---- ---- ---- ------ ----- ------
Composite 2 6.62 53.36 25.4 1.83 0.04 0.34 0.08 0.42 0.354 2.813
------ ----- ------ ------ ---- ---- ---- ------ ----- ------
Weighted Average 6.84 51.66 26.06 1.34 0.06 0.29 0.15 0.33 0.23 3.38
------ ----- ------ ------ ---- ---- ---- ------ ----- ------
Figure 3 below shows the mineral abundance in the feed and final
concentrate of each composite sample, demonstrating the potential
to upgrade the spodumene in the feed to a high-grade concentrate.
The Composite 2 sample recorded a spodumene grade of 80%.
Figure 3 : Mineral abundance in the feed and final concentrate
of the composite samples .
The Company believes the spodumene mineralisation could also be
amenable to dense medium separation ("DMS"). The fine particle size
distribution of the drill chip samples made it unsuitable for DMS
test work, but future sampling and test work will cater for DMS
testing.
LITHIUM RIDGE
Lithium Ridge (ML133) is a fully permitted mining licence
located approximately 35 km southeast of the town of Uis and
Andrada's operating Uis Mine. The Company completed an initial
exploration drilling programme on Lithium Ridge in Q3 2023 (see
announcement dated 6 September 2023). A second phase of drilling,
including mineralogical characterisation, is planned for Q1 2024 to
increase geological confidence, prove continuity of mineralisation
along strike, and to establish a maiden mineral resource estimate.
In addition, the Company plans to conduct comprehensive
metallurgical test work to support future feasibility studies for a
mining and processing facility at Lithium Ridge.
Figure 4 : Andrada's mineral licenses in the Erongo Region of
Namibia. ML134 ("Uis"), ML133 ("Lithium Ridge") and ML129
("Spodumene Hill") all occur within a 40 km radius of the town of
Uis.
Figure 5 : Map displaying the localities of the drill holes and
the mapped surface exposure of pegmatites in the area from which
the composite samples were taken. Composite 1 was sourced from hole
ATNN23 and Composite 2 was sourced from ATNN17 and ATNN18. Line
A-A' indicates the position of the cross section shown in Figure 6
below.
* The composite samples do not represent the full pegmatite
intersections of the holes but were taken from selected sub-samples
within the full intersections.
Figure 6 : Section line A-A' displaying a projection of the
reported drill hole for which the results are reported in this
announcement. Since there is only a single intersection of
pegmatite, the morphology of the unit was inferred from mapped
surface expressions. All holes were drilled at an inclination of
60deg from the horizontal.
COMPETENT PERSON
The technical data in this announcement has been reviewed by
Laurence Robb, a Non-Executive Director of Andrada. Laurence Robb
(BSc Hons, MSc, PhD, FGS, FGSSA, FRSSA) has more than 40 years of
industry-related geological experience. He is registered as a
Professional Natural Scientist with The South African Council for
Natural Scientific Professions and is a Chartered Geologist with
the Geological Society of London. He was Professor of Economic
Geology and Director of the Economic Geology Research Institute at
the University of the Witwatersrand's School of Geosciences. He is
currently based at Oxford University as a Visiting Professor. He
has reviewed the technical disclosures in this release and consents
to the release of the information contained herein.
CONTACT
Andrada Mining Limited
Anthony Viljoen, CEO
Sakhile Ndlovu, Head of Investor
Relations +27 (11) 268 6555
Tavistock Financial PR (United
Kingdom)
Jos Simson
Catherine Drummond
Adam Baynes +44 (0) 207 920 3150
Nominated Adviser
WH Ireland Limited
Katy Mitchell/Andrew de Andrade +44 (0) 207 220 1666
Corporate Advisor and Joint Broker
H&P Advisory Limited
Andrew Chubb
Jay Ashfield
Nilesh Patel +44 (0) 20 7907 8500
Stifel Nicolaus Europe Limited
Ashton Clanfield
Callum Stewart
Varun Talwar +44 (0) 20 7710 7600
About Andrada Mining Limited
Notes to editors
Andrada Mining Limited is a London-listed technology metals
mining company with a vision to create a portfolio of globally
significant, conflict-free, production and exploration assets. The
Company's flagship asset is the Uis Mine in Namibia, formerly the
world's largest hard-rock open cast tin mine.
Andrada is managed by a board of directors with extensive
industry knowledge and a management team with deep commercial and
technical skills. Furthermore, the Company is committed to the
sustainable development of its operations and growth of its
business. This is demonstrated by the manner in which the
leadership team places significant emphasis on creating value for
the wider community, investors, and other key stakeholders. Andrada
has established an environmental, social and governance system that
has been implemented at all levels of the Company and aligns with
international standards.
-END-
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