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|BILBAO - PRELIMINARY METALLURGICAL TESTS INDICATE EXCELLENT METAL RECOVERIES FROM OXIDE ORES||Release Date: 22-01-2009|
Toronto, January 22, 2009, Xtierra Inc. (TSXV - XAG) ("Xtierra"), is pleased to provide a further update on its Bilbao Silver-Zinc-Lead-Copper Project in Zacatecas, Mexico.
Preliminary metallurgical test work on the oxide facies mineralization at Bilbao indicates that a high intensity magnetic separation process results in the creation of a pre-concentrate that is amenable to acid leaching and from which silver, lead, zinc, copper and gold can be successfully recovered.
Metallurgical test work, carried out at the Metallurgical Institute of the University of San Luis Potos� by Dr. Alejandro Lop�z Valdivieso and Dr. Shaoxian Song, using a process of high intensity magnetic concentration (HIMC) on oxide mineralization considered to be of average deposit grade, resulted in a marked pre-concentration of silver, lead, zinc and copper with no significant loss of any of these metals. Recoveries in the pre-concentrate were 86% for silver, 95% for lead, 88% for zinc and 70% for copper with the percentage of iron being reduced from 22% to 7.2%.
With such a major reduction of iron oxide in the concentrate, the sulphuric acid consumption will be greatly reduced in the zinc and copper leaching process. The residue, containing 35% iron, may also be a marketable product to the cement industry.
Earlier test work on the deeper sulphide mineralization indicates excellent metal recoveries and the production of normal zinc, lead and copper flotation concentrates.
Xtierra plans to conduct more extensive metallurgical test work on the oxide, sulphide and mixed ores at Bilbao as part of a planned feasibility study to be carried out during 2009 which will include optimization of the operating parameters for the HIMC process.
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