RCZ

Rio Cristal Resources Corporation (TSX VENTURE:RCZ)(BVLAC:RCZ) ("Rio Cristal" or
the "Company") announced today that it is discussing additional amenability
test-work on zinc oxides from its Cristal project using AmmLeach(R) proprietary
leaching technology. AmmLeach(R) tests conducted by Metaleach Limited (a wholly
owned subsidiary of Alexander Mining) on the Company's zinc oxides produced very
encouraging results in 2008, which support our current efforts to establish a
resource for our high-grade zinc oxide deposits.


Thomas Findley, President and CEO of Rio Cristal, said "we have begun an
aggressive drilling program at our Cristal project and expect to be able to
announce a resource later this year. At the same time, we want to continue
testing the AmmLeach(R) process which we believe has very good potential for
processing high-grade zinc oxides."


For the sample provided from a section of the Company's high grade (19.7% zinc)
drill core, favorable levels of zinc dissolution using AmmLeach(R) were
achieved. As a result, Alexander and Rio Cristal are discussing additional
amenability test-work on more representative samples in 2011. This will include:




--  Optimising leaching parameters; 
--  Measuring and optimising reagent consumption; 
--  Determining particle size effects on recovery; and 
--  Evaluating the various options available to produce a final product and
    measuring impurities in the leach solution. 



About Rio Cristal Resources Corporation

Rio Cristal Resources is a Canadian corporation focused on the discovery and
further development of zinc, copper and gold deposits in Peru. The Company's
most advanced exploration project is the 18,000 hectare Bongara zinc claim block
located in northern Peru. An initial 4,200 meter drilling program confirmed that
the project is within an important emerging Mississippi Valley-type zinc
district. In 2011, Rio Cristal has begun a 6,000 meter drill campaign in with
the objectives of confirming a zinc oxide resource and discovering deeper
sulfide zinc ores. Additionally, the Company is exploring methods of treating
its zinc oxides so that it may make a production decision quickly and
efficiently.


The Company is also conducting surface exploration at its La Cumbre copper oxide
project near Chala, Peru. The process of obtaining drilling permits is underway
and drilling is expected to begin in May, 2011 with an objective of completing
2,000 meters. Rio Cristal's preliminary review of La Cumbre indicates potential
for bulk-mineable copper oxide mineralization grading in excess of 2% copper.
Additionally, there is potential for copper sulfide mineralization as the
project is located within a very prospective belt hosting significant iron oxide
copper deposits.


The Company's shares are listed on the Toronto Stock Exchange, Venture Segment
and the Bolsa de Valores de Lima (Lima Stock Exchange).


This news release includes certain "forward-looking statements" under applicable
Canadian securities legislation. All statements other than statements of
historical fact included in this release, including, without limitation,
statements regarding potential exploration results, future plans and objectives
of the Company are forward-looking statements that involve various risks and
uncertainties. There can be no assurance that such statements will prove to be
accurate and actual results and future results, events and objectives could
differ materially from those anticipated in such statements. Important factors
that could cause actual results to differ materially from Rio Cristal's
expectations include exploration and other risks detailed from time to time in
the filings made by the Company with securities regulators.


This news release does not constitute an offer to sell or solicitation of an
offer to sell any securities in the United States. The securities have not been
and will not be registered under the United States Securities Act of 1933, as
amended (the "U.S. Securities Act") or any state securities laws and may not be
offered or sold within the United States or to U.S. Persons unless registered
under the U.S. Securities Act and applicable state securities laws or an
exemption from such registration is available.

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