ExtrEL leaching system for nickel sulphide mine tailings



    GUELPH, ON, Oct. 25 /CNW/ - ENPAR Technologies Inc. (TSX-V: ENP) (the
"Company") recently announced that it has entered into a definitive patent and
technology license agreement (the "Agreement") with Dundarave Resources Inc.
(TSX-V: DDX) ("Dundarave"). The Agreement provides Dundarave with an option to
acquire an exclusive worldwide license to ENPAR's ExtrEL leaching system
technology and all related intellectual property as it relates to the recovery
and the extraction of nickel and associated by-products contained in the
nickel sulphide mine tailings.

    Technology Description

    The ExtrEL process promises to be a cost-effective and very energy
efficient solid sulphur-rich mining waste dissolution technology. The process
produces a uniform acidic matrix which can then be blended with appropriate
metal, acid and water recovery technologies to develop an integrated
processing circuit. This circuit could be modular in design, and thus
relatively easily transported and installed to function on small remote sites
with easy waste resource access, perhaps even powered by a local Green Energy
source.
    The process applies basic acid dissolution chemistry with minimal energy
input to drive combination oxidation-reduction reactions which dissolve the
sulphur-rich pyrite and pyrrhotite minerals in the tailings wastes. The
combined reactions produce a process stream high in dissolved iron, and a
waste stream of hydrogen sulphide which can be converted using existing
technologies to either elemental sulphur or sulphuric acid.
    The breakthrough ExtrEL process dissolves nickel from tailings. The
nickel, in concentrations approaching 1.0% in both active and closed mill
wastes, can be separated from the acidic solution matrix.
    Unoptimized bench-scale trials of ExtrEL to date have provided over 75%
recoveries of nickel occluded in the pyrrhotite waste from a Sudbury Tailings
stream sample.
    Dundarave Resources has engaged Dr. Graeme A. Spiers, C. Chem., the Chair
of Environmental Monitoring at Laurentian University, to conduct due diligence
on the ExtrEL process. Dr. Spiers has 25 years of research and facilities
management experience in academic, government and commercial laboratory
environments. His research has focused on effects of acidification and extreme
metal insult on pedologic processes, particularly as these relate to seasonal
metal fluxes to water bodies.
    He is the author of over 100 publications, including 35 journal papers,
that have contributed to the understanding of metal translocation in
soil-plant systems, and have also included pioneering work in development of
slurry analytical methodologies for mineral materials.
    According to Dr. Spiers, the ExtrEL technology has two major benefits:
potential economic advantages and potential solution to environmental issues
faced by the mining industry.

    ExtrEL's Economic Advantages

    The target feedstock for the ExtrEL process is not an expensive new ore
body to be developed, but the sulphur-rich tailings waste streams from the
concentrate mills of the modern and closed sulphidic-feed smelter operations
at any location around the globe.

    
    The ExtrEL technology has the potential to revolutionize the modern
    mining industry by:

    -   Recovering economically significant tonnages of base metals such as
        nickel from surface mining industry waste dumps at relatively low
        costs
    -   Producing economically significant tonnages of elemental sulphur or
        sulphuric acid from surface waste dumps as a by-product of the base
        metal extraction process
    -   Recovering precious metals such as rhodium from pyrrhotite-rich
        surface waste dumps at relatively low costs
    -   Converting environmental liabilities into more benign neutral
        drainage generation surface materials such as a building aggregate
        (fine sand for concrete and road construction usage) of minimal
        sulphur and metal content
    

    Potential Reduction of Environmental Liabilities

    The other significant benefit of further developing the ExtrEL technology
into an integrated metal, acid, gas and water recovery system could be the
potential reduction of environmental liabilities for the mining industry.
    The modern metal mining industry is essentially one of the largest waste
management industries in the world. Mill tailings materials are a potential
major environmental legacy and liability to the industry because of acid mine
drainage. The impacts of acid mine drainage can be long-term, lasting for
decades or perhaps even centuries. The mining industry in Canada spends $100 
million annually to control acid mine drainage, with liabilities potentially
reaching several billion dollars.
    Modern mill technologies continue creating waste streams containing in
excess of 0.8% nickel. Metal recovery from such metal and sulphur-rich wastes
could become a stand-alone profit centre while reducing the environmental
liability facing the mining industry.

    Technology Development Plan

    As part of the Agreement, Dundarave will fund an optimization and design
program and the full cost of the construction of the test pilot plant to
process a significant amount of nickel tailings. Dundarave is actively seeking
a suitable nickel sulphide tailings deposit for the demonstration plant.

    The TSX Venture Exchange has not reviewed and does not accept
    responsibility for the adequacy or accuracy of this release.

    ENPAR is a "Technology Company" applying its patented and proprietary
"Electrochemical Technologies" to the treatment of waste water and drinking
water contaminated by metals or nutrients i.e., nitrate/ammonia associated
with the mining, metal processing, chemical, agricultural, municipal and waste
management sectors. The common shares trade on Tier ll of the TSX Venture
Exchange under the symbol "ENP".

    This news release contains forward-looking statements within the meaning
of the "safe harbour" provisions of the Private Securities Litigation Reform
Act of 1995. These forward-looking statements are subject to risks and
uncertainties and other factors that may cause ENPAR Technologies Inc. results
to differ materially from expectations. These include risks relating to market
fluctuations, property performance and other risks. These forward-looking
statements speak only as of the date hereof.





For further information:

For further information: Dr. Gene Shelp, President and CEO, Tel: (519)
836-6155, Fax: (519) 836-5683, E-mail: info@enpar-tech.com, Web Site:
www.enpar-tech.com

Organization Profile

ENPAR TECHNOLOGIES INC.

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