BacTech Environmental Set to Sample Arsenopyrite Concentrate From 2 Ecuador Mines
May 29, 2019, Toronto, Canada
BacTech Environmental Corporation (“BacTech” or the “Company”) (CSE:BAC, US-OTC:BCCEF)
today announced that it has taken initial steps to establish a bioleach project in Ecuador that
will treat high arsenic concentrates produced in the country.
A visit that coincided with the annual Expominas Convention in Quito in late April provided an
opportunity for management of BacTech to identify and secure arsenopyrite concentrate
samples for bioleach work to be conducted at Laurentian University under the direction of the
Company’s Dr. Paul Miller. It is anticipated that samples totalling approximately 35 kg of
arsenopyrite concentrate will be secured from 2 mines in an area that historically has produced
very high levels of arsenic associated with gold. The sample collection should take place in early
June and will be carried out by MSA Labs of Vancouver, Canada. MSA will also be tasked with
providing assays for the samples as well as a 35 element ICP scan for metallurgical data. A
standard bioleach test program will take 6 months to complete.
In Ecuador, high arsenic concentrates are sold mostly to buyers in Asia with severe penalties
applied to the sales price. It is not uncommon for concentrates with up to 15% arsenic to be
sold for as little as 50% of the gold content with no compensation for any related silver or
copper. Bioleaching provides a hydrometallurgical solution to processing these “dirty”
concentrates, as any associated arsenic is produced as a ferric arsenate, meeting United States
Environmental Protection Agency (“EPA”) or local equivalent environmental regulations for
Producers of high arsenic concentrates are constantly searching for an inexpensive means of
processing their material, but this has proven to be very difficult given the global restrictions on
treating concentrates high in arsenic. Smelter and/or roasters have severe limitations on the
amount of arsenic that can be burned as the off-gas is a very toxic arsenic trioxide which is
collected and stored. The Giant Mine in Yellowknife, Canada is a good example of the long-term
effects of burning arsenopyrite as there remains some 250,000 tonnes of this material stored
underground waiting for a disposal solution. In this instance the estimated cost to rectify the
mine site and the associated arsenic is estimated to cost the taxpayers of Canada $1 billion.
Over the past year, BacTech and Laurentian University have run 2, separate bioleach test
programs on 3 different types of material from Ecuador, namely ore, concentrate and tailings.
Results of the first program confirmed the ability of bioleaching to produce and stabilize over
99% of the contained arsenic in the material. Arsenic values in several of the samples reached
as high as 17%. The second test program was designed to focus on different pulp densities
which in turn will provide expected gold percentage recovery. These final results will be
released shortly pending assay by an independent laboratory. The upcoming bioleach work will
focus on concentrate from 2 separate mines from the same area. Should the test work results
conform to historic results on similar materials treated by BacTech, the Company will move to
negotiate a secure feed by paying a higher price per tonne of concentrate than what is received
today. The material will be the base feed for what is initially expected to be a 40 tonne per day
bioleach plant in the area.
A local bioleach circuit would provide many benefits to Ecuador and the affected area of the
plant. Instead of exporting raw material for processing, the plant will allow for local job
creation, increased taxes generated locally and federally and of course, the knowledge that
arsenic associated with gold production in the area is being dealt with in a sustainable manner.
There are many arsenic gold mines in the area, and it is expected that over time the amount of
arsenopyrite concentrate that is produced locally will continue to grow allowing for modular
expansion of the original bioleach plant to handle the increase in feeds.
“We are very excited about starting this new venture. The support we have received from the
Ministry of the Environment has been great as it helps to open doors for us in the country.
These two particular mines are part of a much larger community of mines in the area. It is not
unreasonable to expect that if we build the plant, that others will come forward to supply
concentrates for local processing. The key is getting the commitment to a secure feed so we
can finance the project,” commented Ross Orr, President and CEO of BacTech.
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, Bolivia.
A second project entails BacTech investigating the use of bioleach processing to treat historic
arsenic tailings and arsenopyrite concentrates produced in the Ponce Enriquez area of Southern
Finally, BacTech has recently agreed to participate with a group looking to reprocess the
Arsenic Stockpile in Snow Lake, Manitoba.
For further information contact: Ross Orr, President & CEO, BacTech Environmental
Corporation/ 416-813-0303 ext. 222, Cell 416-346-5529 and
Robin Cook, Investor Relations: 416-809-1738, Email: email@example.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
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results, performance or achievements expressed or implied by the forward-looking statements.
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Company disclaims, other than as required by law, any obligation to update any forward-looking
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management’s estimates or opinions should change, or otherwise. There can be no assurance that
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not to place undue reliance on forward-looking statements.
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