I-Minerals Receives Excellent Halloysite Testing Results

Tue Jun 26, 2012 9:00am EDT

* Reuters is not responsible for the content in this press release.

  VANCOUVER, BRITISH COLUMBIA, Jun 26 (MARKET WIRE) --
I-Minerals Inc. (TSX VENTURE:IMA)(PINKSHEETS:IMAHF) (the "Company")
announces that further to the Company's press release of June 19, 2012
wherein the Company announced it had engaged DURTEC GmbH of
Neubrandenburg, Germany ("DURTEC") to undertake a series of tests to
determine if the basic characteristics of the halloysite produced from
the Bovill Kaolin deposit can be improved through additional processing,
I-Minerals has received the DURTEC report that clearly demonstrates trace
levels of deleterious elements found in the halloysite can be materially
reduced and the brightness of the halloysite product can be significantly
improved.

    DURTEC was provided with a basic halloysite product prepared by Ginn
Mineral Technologies of Sandersville, Georgia using a standard wet
separation technology. Key attributes of the basic halloysite product
included:


-- greater than 90% less than 2 um (microns) 
-- free of crystalline silica 
-- low levels of deleterious heavy metals 
-- high aspect ratio (the ratio of the length of a tube to the diameter).


    DURTEC, under the supervision of Dr. Joachim Schomburg, undertook two
series of testing. The first tests were designed to improve the
brightness of the halloysite by removing as much of the natural occurring
iron content as possible. The iron, which average 1.2% across a small
sample set, may have resulted in the halloysite product having a
relatively low average GE Brightness of 70.8. The second testing
objective was to remove as much of the other heavy metals as possible.
Earlier work by DURTEC indicated I-Minerals' halloysite contained one of
the lowest levels of initial trace elements as compared with five
halloysite products tested and therefore had a preferential starting
point in efforts to achieve a pure product. Several commonly used
techniques for were tested including special chemical bleaching,
calcination and magnetic separation with the following results: 

    Chemical Bleaching

    A selective mixture of acid agents for bleaching resulted in brightness's
up to 90% being achieved together with a strong reduction of heavy metal
contents to below detection limits:


----------------------------------------------------------------------------
As                 Pb                 Cd                 Hg                 
----------------------------------------------------------------------------
less than 5 ppm    less than 20 ppm   less than 0.2ppm   less than 0.1ppm   
----------------------------------------------------------------------------


    Scanning Electron Microscopy ("SEM") work indicated this technique had no
impact on the halloysite crystal structure or the tube morphology.

    Calcination

    Calcination can be used for improvement of whiteness at different
temperature steps:


----------------------------------------------------------------------------
Temperature step                                                            
(heating rate 10K/min, 30 min held)                                  L-value
----------------------------------------------------------------------------
750 degrees C                                                             73
----------------------------------------------------------------------------
1000 degrees C                                                            83
----------------------------------------------------------------------------
1100 degrees C                                                            84
----------------------------------------------------------------------------
1200 degrees C                                                            82
----------------------------------------------------------------------------


    The calcined halloysite nanotube ("HNT") material is expected to be
similar to various Metakaolin products, often used in paper and rubber
industry.

    Magnetic Separation

    Dry powder magnetic separation (field strength 18k Gauss) did not remove
enough of the iron to materially improve the whiteness. Future test work
will include wet High Gradient Magnetic Separator (HGMS) evaluations
using Eriez equipment. The wet HGMS work is expected to provide better
results.

    This initial work clearly demonstrates the halloysite from the Bovill
Kaolin deposits generally responds well to the various techniques
utilized to improve the brightness and reduce the trace levels of heavy
metals. These different processing techniques demonstrate that a range of
HNT-products can be prepared from the Helmer-Bovill clay deposits that
can be used in a range of different applications including ceramics,
plastics and polymers, and life science applications including cosmetics
and possibly pharmaceutical carriers. Multiple markets services by a
diversified HNT product portfolio offer greater sales volumes and the
more pure products offer opportunities in the high value life sciences
markets. 

    "I have worked with halloysite from many of the known deposits around the
world and the results from this latest round of testing add further
support to my belief that I-Minerals' halloysite can be further processed
to yield one of the best halloysite products available," stated Dr.
Joachim Schomburg, President, DURTEC GmbH.

    A. Lamar Long, CPG, is a qualified person ("QP") for I-Minerals inc. and
has reviewed and approved the contents of this release.

    "These results support our believe that the mineral products from the
Bovill Kaolin deposit are high purity high value products," stated Thomas
Conway, President and CEO of I-Minerals Inc. "Our earlier work has
demonstrated we can produce a best in class K-spar product and high
purity quartz products through standard flotation and now we believe we
can produce one of the best halloysite products available based on aspect
ratio, purity and other considerations." 

    I-Minerals Inc.

    Thomas M. Conway, President & CEO

    This News Release includes certain "forward looking statements" within
the meaning of the United States Private Securities Litigation Reform Act
of 1995. Without limitation, statements regarding potential
mineralization and resources, exploration results, and future plans and
objectives of the Company are forward looking statements that involve
various risks. Actual results could differ materially from those
projected as a result of the following factors, among others: changes in
the world wide price of mineral market conditions, risks inherent in
mineral exploration, risk associated with development, construction and
mining operations, the uncertainty of future profitability and
uncertainty of access to additional capital.


    NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICES PROVIDER (AS
THAT TERM IS DEFINED IN THE POLICIES OF THE TSX VENTURE EXCHANGE) ACCEPTS
RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS NEWS RELEASE.

Contacts:
I-Minerals Inc.
Barry Girling
877-303-6573 or 604-303-6573
604.684.0642 (FAX)
info@imineralsinc.com
www.imineralsinc.com

Encompass Communications Inc.
877-566-6592 or 604-630-0770
info@encompassinc.ca

Copyright 2012, Market Wire, All rights reserved.

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