Alexander Mining plc

April 18, 2011 06:30 ET

Alexander Mining plc: Encouraging Preliminary Results from AmmLeach® Amenability Testwork on Rio Cristal's Charlotte Bongara Zinc Oxide Property in Peru

- AmmLeach® amenability testwork on one sample provided from a section of high grade drill core from the Charlotte Bongara zinc oxide property, with a head grade of 19.7% zinc, resulted in favourable levels of zinc dissolution

- Alexander and Rio Cristal are discussing further AmmLeach® amenability testwork on representative samples from Charlotte Bongara

LONDON, UNITED KINGDOM--(Marketwire - April 18, 2011) - Alexander (AIM:AXM)(TSX VENTURE:AXD) is pleased to announce that initial AmmLeach® amenability test work conducted by Alexander's wholly owned subsidiary, MetaLeach Limited ('MetaLeach'), in late 2008 for Rio Cristal Resources Corporation ('Rio Cristal') (TSX VENTURE:RCZ) on its Charlotte Bongará zinc oxide property ('Charlotte Bongará') in Peru produced encouraging results. Alexander and Rio Cristal are now discussing additional AmmLeach® amenability testwork.

For the sample provided from a section of high grade (19.7% zinc) drill core, favourable levels of zinc dissolution using AmmLeach® were achieved. The acid neutralizing capacity (ANC) of the sample was very high, indicating a high carbonate host environment. The high ANC indicates that acid leaching is unlikely to be economic. The leaches were not optimized and it is probable that improvements in leaching recovery will occur with further test work.

Based on the high levels of zinc dissolution, using AmmLeach® could be a viable commercial scale process to use for processing at Charlotte Bongará. The additional AmmLeach® amenability testwork being discussed would be on more representative samples and would include:

  • Optimising leaching parameters;

  • Measure and optimising reagent consumption;

  • Particle size effects on recovery; and

  • Evaluating the various options available to produce a final product and measure the impurities in the leach solution.

Martin Rosser, CEO of Alexander, said:

"We are pleased with these initial results, which support the excellent potential for using our AmmLeach® process to treat high grade zinc oxide deposits."

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 4,200m drilling program confirmed that the project is within an important emerging zinc district. In 2011, Rio Cristal began a 6,000m drill campaign in with the objectives of confirming a zinc oxide resource and discovering deeper sulphide zinc ores. Additionally, the Company is exploring methods of treating its zinc oxides so that it may make a production decision quickly and efficiently.

About Alexander Mining plc

Alexander is a mineral processing technology company focused on the commercialisation of its proprietary mineral processing technology.

This news release may contain forward looking statements, being statements which are not historical facts, including, without limitation, statements regarding potential mineralization, exploration results, resource or reserve estimates, anticipated production or results, sales, revenues, costs, "best-efforts" financings or discussions of future plans and objectives. There can be no assurance that such statements will prove accurate. Such statements are necessarily based upon a number of estimates and assumptions that are subject to numerous risks and uncertainties that could cause actual results and future events to differ materially from those anticipated or projected. Important factors that could cause actual results to differ materially from the Company's expectations are in Company documents filed from time to time with the TSX Venture Exchange and provincial securities regulators, most of which are available at The Company disclaims any intention or obligation to revise or update such statements unless required by law.

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.

Contact Information

  • Alexander Mining plc
    Martin Rosser
    Chief Executive Officer
    Mobile: + 44 (0) 7770 865 341

    Alexander Mining plc
    Matt Sutcliffe
    Executive Chairman
    Mobile: +44 (0) 7887 930 758

    Alexander Mining plc
    1st Floor, 35 Piccadilly
    London, W1J 0DW
    +44 (0) 20 7292 1300
    +44 (0) 20 7292 1313

    Nominated Advisor and Joint Broker:
    Ambrian Partners Limited
    Samantha Harrison / Jen Boorer
    +44 (0) 20 7634 4700

    Joint Broker:
    XCAP Securities plc
    John Grant / David Newton
    +44 (0) 20 7101 7070

    Public/Media Relations:
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    Tim Blackstone
    +44 (0) 20 7242 9786