- Confirms that it has achieved complete and total recovery in leach of lithium from the bulk material provided by its partner Iconic Minerals (TSX-V: ICM)
- St-Georges’ patent pending leaching technology achieved 100% leaching of lithium while not affecting the majority of the solids
- 88% of the initial feed material is unleached which helps with chemicals consumption and tailings disposal.
Montreal, March 31, 2019 / St-Georges Eco-Mining Corp. (CSE: SX) (OTC: SXOOF) (FSE: 85G1) is pleased to inform its shareholders that it can confirm that it has achieved complete and total recovery in leach of lithium from the bulk material provided by its partner Iconic Minerals (TSX-V: ICM) originating from their Bonnie Claire lithium project in Nevada.
St-Georges’ patent pending
leaching technology achieved 100% leaching of lithium while not
affecting the majority of the solids. 88% of the initial feed material
is unleached which helps with chemicals consumption and tailings
disposal.
The patent pending mix of
nitric and citric acids being used do not require high temperature and
high pressure and no calcination is required. The objectives of the
technology development was simply to have the lowest chemical cost
impact.
The impacts on the Bonnie
Claire Deposit of the first phase of the process that includes
classification, concentration and leaching at atmospheric pressure and
low temperature has shown an average concentration gain from 963 ppm Li
to 8,025 ppm Li, or a gain of 8,333 percent.
St-Georges is currently
testing different calibration and improving on its selective leaching in
order to target only the recuperation in the leach of the lithium and
magnesium and achieve better grades in the leach.
Potential Fertilizer By-Products
In addition to the lithium,
the selective leaching collects mainly the salt family elements such as
Sodium (Na), Magnesium (Mg), Calcium (Ca) and items like carbonates. The
company believe that this could lead to-possible development of
fertilizer by-products in the nitrate family that would potentially positively impact the economics of the Bonnie Claire project.
Current On-Going Developments
The next tests to be started
this week will focus on reducing the total time of contact and we
expect that the selectivity will be increased. In addition, St-Georges
is in the process of purchasing a electrolysis unit to make LiOH to be
added to the pilot plant with a further focus on using less chemicals.
Work with various vendors of resins has been initiated to optimize the
lithium purification steps prior to lithium hydroxide production.
Phase 1 Confidential Report
The phase 1 confidential
report is currently being independently reviewed and a final public
summary should be disseminated within 45 days. Detailed tests result and
confidential information related to the process flow-sheet has been
provided to Iconic management. For details and guidelines regulating the
relation between Iconic and St-Georges, please read December 7, 2017
press release “Licensing Technology Agreement with Iconic Minerals”.
Summary of the proposed industrial process
Developmental testing has
results in 100% of the lithium leached to be repeatedly recuperated
using the patent pending leaching technology developed by St-Georges.
Below are the steps tested in the course of Phase 1 of the development of the process.
Step 1: Screening
The lithium material is being screened out to remove pebbles and other coarse material like calcium.
(Independent testing and
review of this stage was performed during the course of the months of
March and April 2018 by SGS Lakefield laboratory in Ontario)
Step 2: De- Agglomeration
The agglomerated material is being fed into a roll grinder to break down the feed into the original fine particles before drying.
This was also done and reviewed by SGS Laboratory. After these 2 initial steps review, SGS performed an XRD and chemical analysis for each of the elements and crystalline forms.
Step 3: Concentration
Two approaches were
developed and tested. Air classification and flotation concentration.
These co-exist as linear task A and B of the concentration step at this
stage. St-Georges is currently working on eliminating one of the
sub-tasks with the hopes of drastically reducing costs and processing
time.
Task 3a: Air Classification
In this step the material is
separated by density and particle size. In the particular case of the
Bonnie Claire material, the lithium is contained in the superfine
particles. These particles are too fine to be screened.
Independent review and
testing of Task 3a were performed in the scope of the month of November
2018 by the laboratories of Netzsch Premier Technologies LLC of Exton,
Pennsylvania. The resulting material was reduced by 55% with a cut-off
at 5 microns.
The resulting material was
sent by Netzsch for chemical analysis to the laboratories of the Centre
de Technologie minerales et de plasturgie Inc. (CTMP) at Tedford-Mines
in Quebec.
The lab results confirmed that 100% of the lithium remained in the resulting concentrate when properly de-agglomerated.
Task 3b: Floatation Concentration
The CTMP labs performed, at
the demand of St-Georges, a traditional froth floatation with deionized
water. These tests were unsuccessful forcing the company metallurgists to adopt a different approach.
St-Georges patent pending technology using a silicate salt saturated medium will be independently reviewed and tested with bulk material within the first part of the month of April by CTMP.
Step 4: Selective Leaching
Using St-Georges’ patent
pending acid mix solution of nitric and citric acids, the CTMP reviewed
and independently tested 2 batches of material from the Bonnie Claire
lithium deposit.
Leach test 1:
Material from this initial test was passed through tasks 1 and 2 but skipped classification and concentration. The results are:
100% of the lithium was
leached at atmosphere pressure and low temperature. The total leach time
was of 1 hour resulting in 12% of the initial total mass. The company
set-up and intends to improve on that result.
Leach test 2:
Material from this leach
test was passed through tasks 1, 2 and 3a. 100% of the lithium was
leached at atmosphere pressure and low temperature. The total leach time
was of 1 hour resulting in 12% of the initial total mass.
Optimization of these tasks
should yield results in industrial settings that would reduce the total
mass to a target percentage below 5%
Joel
Scodnick, P.Geo, St-Georges Vice-President Exploration is a qualified
person under NI 43-101 and has reviewed and approved the technical
content of this release.
ON BEHALF OF THE BOARD OF DIRECTORS
“Enrico Di Cesare”
ENRICO DI CESARE, DIRECTOR & VICE-PRESIDENT RESEARCH & DEVELOPMENT
The
Canadian Securities Exchange (CSE) has not reviewed and does not accept
responsibility for the adequacy or the accuracy of the contents of this
release.
