U3O8 Corp. Reports Further Positive Metallurgical Test Results from the Laguna Salada Project, Argentina

U3O8 Corp. (TSX VENTURE:UWE), a Canadian-based company focused on exploration
and resource expansion of uranium and associated commodities in South America,
reports positive alkaline leach results on the uranium- and vanadium-bearing
gravels from the Guanaco area of the Laguna Salada Project, Chubut Province,
Argentina, which show:




--  94% uranium extraction and 51% vanadium recovery from the upgraded fine
    component of the gravels; and 
--  Rapid uranium-vanadium extraction, with the best results achieved after
    only four hours of leaching. 



"This excellent uranium recovery using alkaline leach - which is potentially
lower cost than acid leach due to the modest reagent consumption expected -
could further enhance the economic viability of the Laguna Salada as a
potentially low-cost project," said Richard Spencer, U3O8 Corp's President and
CEO. "Laguna Salada has many positive characteristics. Firstly, uranium and
vanadium lie within a few metres from surface in soft, unconsolidated gravel
that should be amenable to low-cost mining techniques with no blasting or
crushing required. Secondly, simple screening separation of the pebbles and
coarse sand concentrates the uranium-vanadium in the fine material and increases
uranium grades to approximately 620-670ppm - comparable to the head grades of
similar deposits operating elsewhere in the world(1). Thirdly, most of the fine
metal-rich material in the Guanaco area, which constitutes 90% of the Laguna
Salada deposit, can be leached quickly with alkaline reagents achieving maximum
uranium recoveries in only four hours. Metallurgical testing will be ongoing to
optimize the recovery and beneficiation results that we have achieved to date."


Metallurgical Test Work

The Laguna Salada Project contains two slightly different types of gravel
located in distinct areas: the Guanaco and the Lago Seco sectors. Both gravels
are soft and unconsolidated. Samples from various sites in each area were
excavated with a backhoe and sent, without any processing or crushing, to SGS
Lakefield's laboratory in Lakefield, Ontario, where they were combined into one
large sample from each area and underwent metallurgical testing. The test
results from the two areas are summarized as follows:


1. Leach Tests

Guanaco Area

Two alkaline leach tests were conducted on the Guanaco fines: one at a
temperature of 80 degrees C over a 72-hour period and another at 90 degrees C
over a 48-hour period. The best uranium recovery of 94.1% was achieved at a
temperature of 90 degrees C after four hours of leaching. Uranium extraction
decreased with time due to re-precipitation of uranium; hence, shorter leach
times are advantageous. Vanadium extraction was 50.9% at four hours, rising to
59.1% after 48 hours (Table 1).


Acid leach tests showed 74% uranium and 86% vanadium recovery after a leach time
of 36 hours (see March 2, 2011 press release). Net acid consumption was 18.6
kilogram/tonne ("kg/t") per tonne of raw mineralized gravel.


Given the effectiveness of alkaline leach on the uranium at Guanaco and the
expected modest consumption of reagents, alkaline leaching is probably an
economically superior option at Guanaco, which contains 90% of the National
Instrument 43-101 ("NI 43-101") uranium-vanadium resource at Laguna Salada.


Table 1 - Results from an Alkaline Leach Test on the Fine-Grained Component of
Guanaco Gravel




----------------------------------------------------------------------------
Time               Uranium grade  Vanadium grade       Uranium      Vanadium
                           (ppm)           (ppm)      recovery      recovery
------------------------------------------------                            
Calculated head                                                             
 grade                       658           1,131                            
------------------------------------------------                            
                    Residue grade in leach test                             
----------------------------------------------------------------------------
4 hours                       39             555         94.1%         50.9%
----------------------------------------------------------------------------
22 hours                      55             476         91.7%         57.9%
----------------------------------------------------------------------------
48 hours                     117             468         82.2%         59.1%
----------------------------------------------------------------------------



Lago Seco Area

Alkaline leach results were poor for material from Lago Seco due to the presence
of gypsum, a mineral that reacts with, and consumes, the alkaline reagents.
Tests conducted at temperatures of 80 degrees C and 90 degrees C showed
recoveries of less than 5% for uranium and less than 10% for vanadium. In
contrast, acid leach was very effective showing recoveries of 96% for uranium
and 71% for vanadium after 36 hours of leaching with 49.5kg/t of acid
consumption per tonne of raw mineralized gravel (see March 2, 2011 press
release).


Additional metallurgical testwork will evaluate ways of optimizing the recovery
of uranium and vanadium from the Guanaco and Lago Seco areas of the Laguna
Salada deposit.


2. Beneficiation

A key attribute of Laguna Salada is the ease with which the fine-grained uranium
and vanadium minerals can be concentrated into a small fraction of the raw
gravel by simple screening to remove the coarse particles and pebbles (see March
2, 2011 press release). Tests conducted by SGS Lakefield showed that uranium and
vanadium grades can be increased by four to 11 times (Table 2) in the screened
fines. For uranium, this would lead to a head grade (the metal-rich fines that
would enter a processing plant) of approximately 620-670ppm - similar to head
grades of operating surficial uranium deposits elsewhere in the world(1).


The Guanaco sector of Laguna Salada showed that a grade of 55ppm U3O8 was
upgraded to a value of 623ppm U3O8 in the screened fines (11.4 times increase in
uranium grade from the original raw gravel). A vanadium value of 349ppm V2O5 in
the raw gravel increased to 1,893ppm V2O5 in the fine material (5.4 times
increase in vanadium grade).


A U3O8 grade of 161ppm from the Lago Seco area increased to 668ppm U3O8 as a
result of the screening (4.1 times increase in uranium grade). A V2O5 grade of
416ppm increased to 1,202ppm V2O5 in the screened fines (2.9 times increase in
vanadium grade).


Table 2 - Summary Results from the Screen Samples at Laguna Salada



----------------------------------------------------------------------------
                 Uranium Grade               Vanadium Grade                 
         --------------------------------------------------------           
                              Upgrade                     Upgrade
                       U3O8    factor    V2O5      V2O5    factor Percentage
Sector       U3O8     grade       for   grade     grade       for   of fines
of the   grade in        in   Uranium      in        in  Vanadium     (finer
Laguna        raw  screened        in     raw  screened        in       than
Salada     gravel     fines  screened  gravel     fines  screened  0.1mm) in
deposit     (ppm)     (ppm)     fines   (ppm)     (ppm)     fines raw gravel
----------------------------------------------------------------------------
Guanaco        55       623    11.4 X     349     1,893     5.4 X       8.0%
----------------------------------------------------------------------------
Lago Seco     161       668     4.1 X     416     1,202     2.9 X      23.3%
----------------------------------------------------------------------------



Regulatory Update on Chubut Province

While there is presently an open-pit mining ban in Chubut Province, draft
legislation is reported to propose that open-pit mining be allowed in the
central semi-desert plain of the province. A similar approach, that allows
mining in the central plain, is in effect in the adjacent Santa Cruz Province.
Laguna Salada and several other mining projects are situated in this central
plain of Chubut Province including CNEA's (Argentinean National Nuclear
Authority) Cerro Solo uranium deposit and Pan American Silver's Navidad silver
project, both of which are reported to be due for development by open-pit mining
methods. Both of these projects are moving towards production and indications
are that a change in Chubut Province's mining policy may be made in the short-
to medium-term.


Qualified Persons & Accreditation

Mr. John Goode, P.Eng., a Qualified Person within the definition of that term in
NI 43-101 of the Canadian Securities Administrators, has overseen the
metallurgical testwork carried out by SGS Lakefield, and verified the technical
information relating to the tests from which results are reported in this press
release. Dr. Richard Spencer, P. Geo., President & CEO of U3O8 Corp., a
Qualified Person within the definition of that term in NI 43-101 of the Canadian
Securities Administrators, has supervised the preparation of, and verified the
technical information relating to the Laguna Salada Project provided above.


SGS has been undertaking metallurgical testwork for over 50 years and its
Lakefield facility is ISO/IEC 17025 accredited.


About U3O8 Corp.

U3O8 Corp. is a Toronto-based exploration company focused on exploration and
resource expansion of uranium and associated commodities in South America - a
promising new frontier for uranium exploration and development. U3O8 Corp. has
one of the most advanced portfolios of uranium projects in the region comprising
NI 43-101 compliant resources in Guyana and Argentina to significant historic
resources in Colombia.


For information on U3O8 Corp's Laguna Salada Project, refer to the technical
report dated May 20, 2011 titled, "Laguna Salada Project, Chubut Province,
Argentina: NI 43-101 Technical Report: Initial Resource Estimate" available on
U3O8 Corp's web site at www.u3o8corp.com and on SEDAR at www.sedar.com.


(1) Similar deposits elsewhere in the world such as Langer Heinrich typically
have a mill feed grade of 550-600ppm after beneficiation. These deposits have
not been independently verified by U3O8 Corp. and information regarding these
deposits is drawn from publicly available information.


Forward-Looking Statements

Certain information set forth in this news release may contain forward-looking
statements that involve substantial known and unknown risks and uncertainties.
These forward-looking statements are subject to numerous risks and
uncertainties, certain of which are beyond the control of U3O8 Corp., including,
but not limited to, the possibility that the open-pit mining ban in Chubut
Province may not be lifted or amended on terms that would allow for mining of
the Laguna Salada Project, the impact of general economic conditions, industry
conditions, volatility of commodity prices, risks associated with the
uncertainty of exploration results and estimates and that the resource potential
will be achieved on exploration projects, currency fluctuations, dependence upon
regulatory approvals, and the uncertainty of obtaining additional financing and
exploration risk. Readers are cautioned that the assumptions used in the
preparation of such information, although considered reasonable at the time of
preparation, may prove to be imprecise and, as such, undue reliance should not
be placed on forward-looking statements.


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