Alexander Mining plc Firestone selects AmmLeach® Process for its Torlon Hill Zinc-Lead-Silver Oxide Project in Guatemala

Alexander Mining plc Firestone selects AmmLeach® Process for its Torlon Hill Zinc-Lead-Silver Oxide Project in Guatemala

Alexander and Firestone Ventures Inc. are pleased to announce that Firestone has decided to advance investigating the use of AmmLeach® at its Torlon Hill project in Guatemala.  Firestone is in discussions with Alexander on proposals for further bench-scale work, column testing and a demonstration test plant designed to test further the application of the AmmLeach® process.  

This follows on from Firestone's extensive preliminary metallurgical testwork on the Torlon Hill deposit using a variety of methods.  In June 2011, the summary findings of a study ('Study') by consultant David Lunt of Stirling Process Engineering investigating the use of AmmLeach® for processing material from Firestone's Torlon Hill property were announced. 

The Study supported a conceptual flow sheet using the AmmLeach® process in a heap leaching, solvent extraction and steam stripping process to produce a zinc oxide product.  In addition, the adoption of heap leaching would eliminate the need for milling, agitation leaching equipment and solid-liquid separation.  As a result, significant cost savings should be possible using AmmLeach®, especially since no on-site acid plant is required. 

Martin Rosser, CEO of Alexander, said: "We are delighted that Firestone has selected AmmLeach® as its preferred processing method option at Torlon Hill, as well as for other potential Guatemala sources of feedstock.  We greatly look forward to working with Firestone to advance its project. "

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