BacTech Reports First Stage Metallurgical Test Results
25 Octobre 2017 - 2:50PM
InvestorsHub NewsWire
BacTech Reports First Stage
Metallurgical Test Results
Toronto, Canada -- October 25, 2017 -- InvestorsHub NewsWire --
BacTech Environmental Corporation (“BacTech” or the “Company”),
(CSE: BAC, OTC: BCCEF) today released the
results from its initial metallurgical test work on material
sourced from the Telamayu tailings in Bolivia.
Overall the results were positive as expected and additional test
work using different reagents will be carried out immediately to
potentially add more metal recovery. The results are broken down
below by metal type.
Copper
Bench scale laboratory washing tests conducted at ambient
temperature using 1 kg samples of ‘as-received’ material gave a
copper extraction of between 56.4% and 66.9%. The variation in
recovery was dependent upon whether acid additions were made to the
wash water. A larger scale batch test
using 120kg of feed resulted in a copper extraction of
59.6% with a sulphuric acid consumption of 21.6kg/t of feed.
Cementation of copper from the wash solution gave a cement quality
copper precipitate of 97.8% purity and a scrap iron consumption of
1.08kg iron per kg of copper precipitated. Copper recovery from the
solution was 99.9%. After this first step of copper
recovery, 30kg of washed material was screened at 65mesh (230um)
and a bulk sulphide flotation test conducted under acidic
conditions on the undersize to produce a silver copper rougher
concentrate. The results from flotation of this undersize fraction
indicated that a further 23.5% of the copper present in the
original ‘as-received’ feed can be captured into a flotation
concentrate, complimented by 61% of the silver. The concentrate
assayed 753g/t silver and 0.71% copper. The combination of copper
recovered from wash water combined with the copper reporting to the
rougher flotation concentrate gave an overall copper recovery of
83.1%.
Silver
The silver remains inert in the acid washing stage and remains
unaltered whether washing is conducted or not. Silver recovery for
the second flotation test was improved to 75.3% compared to the
recovery obtained from the first test of 61% - although
into a higher concentrate mass of 33.5%. The second
flotation test was conducted under alkali conditions and a
different reagent regime. This suggests that conducting further
optimization work on reagent schemes, may lead to further
improvements in silver recovery.
Such an improvement on flotation reagent regimes was investigated
by using a sulphidization step prior to flotation. The
objective of this step is to make semi-oxidized material more
amenable to the sulphide flotation process. This resulted in
a silver recovery of 65% into a concentrate mass of 22.2% and an
assay value of 3,190g/t silver while copper recovery also improved.
These tests support the premise that conducting further flotation
optimization work may lead to improved grade and metal
recovery.
Tin
The tailings from the flotation of copper and silver were subjected
to additional flotation testing for the recovery of tin. From the
limited flotation conditions investigated, 33.1% of the tin was
recovered into a concentrate of 13.1% by mass but at a very low
grade of 3.1% tin. Further test work using a wider range of
flotation reagents and test conditions may result in an improvement
in both tin grade and recovery. Alternative methods for upgrading
an improved tin rougher concentrate may also improve the final
concentrate grade while reducing loss of recovery. Initial
diagnostic type testing using a laboratory super-panner recovered
42.4% of the tin at a concentrate grade of 9.6% into a mass of
6.4%. These results are preliminary in conclusion because of the
exploratory nature of the gravity techniques investigated in this
phase of test work. The application of magnetic separation to
remove hematite iron gangue may also be of value for upgrading
final concentrates.
“As a first pass we are happy with the results. This allows us to
narrow down the focus on the tin that has been trickier given the
small size of the material. We will start the tin work as soon as
possible. In the interim we can start to look at engineering for
the copper and silver,” stated Ross Orr, President and CEO of
BacTech.
All the test work was conducted at the University of Oruro in
Bolivia, an accredited lab for metallurgical test work.
Finally, the Company announced today that
the Board of Directors have approved the issuance of 2,200,000
options to purchase common shares of the Company to directors,
officers, employees and consultants of the Company. The exercise
price of the options is $0.10. They are subject to a
four-month hold and have a term of 5 years.
The total number of outstanding options
under the Company’s plan, including the grant above, is now 5.39M
options or approximately 8.25% of the outstanding shares. The Stock
Option Plan allows for up to 10% of the outstanding common shares
to be reserved for stock options.
Project
Overview
The Telamayu project involves the
environmental remediation of the “Antiguo” tailings with an option
on the larger “Nuevo” tailings, both situated at the Telamayu mill
site near the town of Atocha in the Department of Potosi in
Bolivia. As part of the remediation process BacTech will recover
silver, tin, and copper utilizing a conventional gravity and
flotation process supported with a copper cementation
circuit.
The existing Telamayu mill concentrator
has generated the Antiguo and Nuevo tailings by processing
mineralized material from the surrounding mines for over 80 years.
There is considerable infrastructure at the mill site including
high voltage power, rail, mill housing, and a local workforce. The
current infrastructure will contribute to a reduction in capital
costs of the project. Currently metallurgical test work is underway
to determine the percentage of metal to be recoverable. Results are
expected in October.
Qualified
Person
Dr. Antonio Salos Casado, P.Eng.,
Director of Faculty at the Technical University of Oruro, Bolivia
is an independent Qualified Person and has reviewed and approved
the contents of this release.
Company
Profile
BacTech Environmental Corporation holds
the perpetual, exclusive, royalty-free rights to use the patented
BACOX bioleaching technology for the reclamation of tailings and
mining waste materials. The Company’s principal focus is a
high-grade silver/copper/tin tailings project called Telamayu,
located in Atocha, Bolivia, in association with COMIBOL, the state
mining group. Testing at Laurentian University in Canada has begun
to test the ability of bioleaching to treat high arsenic
concentrates sourced in Ecuador. The Company continues to field
enquiries globally with respect to additional opportunities for
remediation, including licensing transactions for the
technology.
For further information
contact: Ross Orr,
President & CEOBacTech
Environmental Corporation/ 416-813-0303 ext. 222Email: borr@bactechgreen.com Lalli
Marrato, Investor Relations: 647-669-7646 Email: lalli@frontiermcg.com
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Special Note Regarding
Forward-Looking Statements
This news release contains
“forward-looking information”, which may include, but is not
limited to, statements with respect to future tailings sites,
sampling or other investigations of tailing sites, the Company’s
ability to make use of infrastructure around tailings sites or
operating performance of the Company and its projects. Often, but
not always, forward-looking statements can be identified using
words such as “plans”, “expects”, “is expected”, “budget”,
“scheduled”, “estimates”, “forecasts”, “intends”, “anticipates”, or
believes” or variations (including negative variations) of such
words and phrases, or state that certain actions, events or results
“may”, “could”, “would”, “might” or “will” be taken, occur or be
achieved. Forward-looking statements involve known and unknown
risks, uncertainties and other factors which may cause the actual
results, performance or achievements of the Company to be
materially different from any future results, performance or
achievements expressed or implied by the forward-looking
statements. Forward-looking statements contained herein are made as
of the date of this news release and the Company disclaims, other
than as required by law, any obligation to update any
forward-looking statements whether because of new information,
results, future events, circumstances, or if management’s estimates
or opinions should change, or otherwise. There can be no assurance
that forward-looking statements will prove to be accurate, as
actual results and future events could differ materially from those
anticipated in such statements. Accordingly, the reader is
cautioned not to place undue reliance on forward-looking
statements.
Shares outstanding
65,302,930
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.
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