TIDMSAV
RNS Number : 1313T
Savannah Resources PLC
16 July 2020
16 July 2020
Savannah Resources Plc
('Savannah' or the 'Company')
Mina do Barroso Lithium Project Update
Excellent Metallurgical Results from Spodumene Lithium
Conversion Test work
Savannah is pleased to announce that the ongoing metallurgical
test work programme associated with its Mina do Barroso Lithium
Project ("Mina do Barroso" or the "Project") continues to produce
excellent results. The latest test work evaluated the refining
characteristics of Mina do Barroso's spodumene concentrate for the
production of battery grade, lithium chemicals. The key findings
are summarised below:
-- High lithium recovery rates were achieved from 49kgs of
Grandao concentrate via the first two stages of conventional
processing (calcination/acid roasting and water leaching) in the
production of lithium chemicals
-- The third stage (solution purification followed by
causticisation and lithium crystallization) of production of
battery grade chemicals was planned but has been temporarily
postponed due to COVID-19 related restrictions at the laboratory in
the United States
-- Impurity levels are manageable from the first two stages, and
production of battery grade lithium hydroxide should be readily
achievable from the third stage of testing
-- Savannah will update the market on the third stage once more
clarity on the revised schedule can be provided
To view the full press release including any maps, figures or
tables, please use the following link:
http://www.rns-pdf.londonstockexchange.com/rns/1313T_1-2020-7-15.pdf
David Archer, Savannah's Chief Executive Officer said, "It is
encouraging to see excellent results from the metallurgical test
work which continues to validate Mina do Barroso as a conventional
lithium project in terms of the process flowsheet. These latest
results give a further clear indication that battery grade lithium
chemicals can be produced efficiently from Mina do Barroso
concentrate and provide increased confidence in the Project both
for Savannah and the potential customers for our lithium
concentrate product.
Test work will continue over the coming months to complete the
programme and to help refine our understanding of the behaviour of
the material. We expect the results to provide more evidence for
our potential customers regarding the suitability of the Project's
lithium concentrate for refining into lithium hydroxide, the key
lithium-ion-battery chemical."
Overview of the lithium concentrate refining characteristics
test work
Savannah's consultant, FLSmidth ( https://www.flsmidth.com/ )
has completed the first two phases of a three-phase programme to
assess the refining characteristics of the Mina do Barroso
spodumene via conventional calcination, leaching and purification
to produce battery grade lithium chemicals.
Figure 1. Process of spodumene concentrate production to lithium
hydroxide production
Phase 1 (Calcination and acid leach)
Savannah has successfully completed a programme of calcination
testing (heating in controlled conditions), achieving effective
conversion of spodumene from the alpha to beta phase (changing its
atomic structure), as required for downstream extraction of
lithium. The laboratory scale study was performed by FLSmidth in
the United States on a 49 kg sample of spodumene concentrate
produced from drill core broadly representative of the first five
years of mining from the Grandao deposit.
Progressive samples of solids were taken during the batch
calcination and tested for acid soluble lithium content. The
results showed that 96% of lithium was converted to the
acid-soluble beta phase by heating the spodumene to 1,075degC for a
period of 30 - 50 minutes. This was validated by an electric tube
furnace test, which achieved 98% conversion within 30 minutes.
These results are typical of lithium refining operations and
support selection of a conventional processing route.
A composite of the calcined solids was then mixed with sulphuric
acid and the acidified calcine roasted at 275 - 300degC for 1 hour,
then subjected to a water leach test. The water-soluble lithium
grade reported corresponded to a conversion rate of 96.1%.
Furthermore, impurities, such as iron, were all at levels that
should be readily manageable by conventional purification
methods.
Phase 2 (Water leach and vacuum filtration)
Further test work was completed by FLSmidth on the pre-treated
(roasted/acid baked) Savannah concentrate from phase 1 of the
program to evaluate the efficiency of a lithium water leach, and
the subsequent solid-liquid separation via vacuum filtration.
Seven water leach tests were executed in a small test programme
developed to evaluate the effect of temperature and percent solids
on leach kinetics and lithium extraction. Key results were:
-- Lithium extraction of up to 94.6% was achieved.
-- Lithium extraction was not sensitive to either temperature or
percent solids. This indicates that no heating is required for the
leach, and that high concentration leach solutions can be produced,
both reducing the overall operating cost.
Slurry from the leach tests was dewatered and washed by vacuum
filtration on a standard test rig. The filtration rates recorded
indicate that relatively rapid and efficient dewatering and
filtration of the material is possible.
Phase 3 (Purification and crystallization)
The third phase of testing involves solution purification
followed by causticisation and lithium hydroxide monohydrate
(LiOH.H(2) O) crystallization to produce battery grade lithium
products. Based on the composition of the leach solutions,
downstream processing steps should be straightforward by
conventional methods.
This step has been postponed due to COVID-19 related
restrictions at the laboratory. At this stage it is not clear when
the restrictions will be lifted to allow this work to proceed.
Savannah will update the market when further information is
available.
Competent Person Statement
The information in this announcement that relates to exploration
results is based upon information compiled by Mr Dale Ferguson,
Technical Director of Savannah Resources Limited. Mr Ferguson is a
Member of the Australasian Institute of Mining and Metallurgy
(AusIMM) and has sufficient experience which is relevant to the
style of mineralisation and type of deposit under consideration and
to the activity which he is undertaking to qualify as a Competent
Person as defined in the December 2012 edition of the "Australasian
Code for Reporting of Exploration Results, Mineral Resources and
Ore Reserves" (JORC Code). Mr Ferguson consents to the inclusion in
the report of the matters based upon the information in the form
and context in which it appears.
The information in this release that relates to metallurgy and
metallurgical test work has been reviewed by Mr Tim Newton,
MAusIMM, MSc (Mineral Economics), GradDip (Extractive Metallurgy),
B. Eng. (Chemical Engineering). Mr Newton is not an employee of the
company, but is employed as a contract consultant. Mr Newton is a
Member of the Australasian Institute of Mining and Metallurgy, he
has sufficient experience with the style of processing response and
type of deposit under consideration, and to the activities
undertaken, to qualify as a competent person as defined in the 2012
edition of the "Australian Code for the Reporting of Exploration
Results, Mineral Resources and Ore Reserves" (The JORC Code). Mr
Newton consents to the inclusion in this report of the contained
technical information in the form and context as it appears.
Regulatory Information
This announcement contains inside information for the purposes
of Article 7 of Regulation (EU) 596/2014.
**ENDS**
For further information please visit www.savannahresources.com
or contact:
Savannah Resources PLC Tel: +44 20 7117 2489
David Archer, CEO
SP Angel Corporate Finance LLP (Nominated Tel: +44 20 3470 0470
Advisor)
David Hignell / Charlie Bouverat
finnCap Ltd (Joint Broker) Tel: +44 20 7220 0500
Christopher Raggett
WH Ireland (Joint Broker) Tel: +44 20 7220 1698
James Joyce/ Matt Chan (Corporate Finance)
Adam Pollock/ Jasper Berry (Corporate
Broking)
St Brides Partners Ltd (Financial PR) Tel: +44 20 7236 1177
Charlotte Page / Cosima Akerman
About Savannah
Savannah is a diversified resources group (AIM: SAV) with a
portfolio of energy metals projects - lithium in Portugal and
copper in Oman - together with the world-class Mutamba Heavy
Mineral Sands Project in Mozambique, which is being developed in a
consortium with the global major Rio Tinto. The Board is committed
to serving the interests of its shareholders and to delivering
outcomes that will improve the lives of the communities we work
with and our staff.
The Company is listed and regulated on AIM and the Company's
ordinary shares are also available on the Quotation Board of the
Frankfurt Stock Exchange (FWB) under the symbol FWB: SAV, and the
Börse Stuttgart (SWB) under the ticker "SAV".
This information is provided by RNS, the news service of the
London Stock Exchange. RNS is approved by the Financial Conduct
Authority to act as a Primary Information Provider in the United
Kingdom. Terms and conditions relating to the use and distribution
of this information may apply. For further information, please
contact rns@lseg.com or visit www.rns.com.
END
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