Rio Cristal Resources Corporation

Rio Cristal Resources Corporation

April 18, 2011 09:30 ET

Rio Cristal Updates Metallurgical Tests and Drilling at the Bongara Zinc Project

VANCOUVER, BRITISH COLUMBIA and LIMA, PERU--(Marketwire - April 18, 2011) - 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® proprietary leaching technology. AmmLeach® 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® 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® 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 Bongará 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.

Neither 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 release.

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