Firestone Ventures has selected Alexander Mining’s AmmLeach processing method for its Torlon Hill project in Guatemala.

Firestone decided to investigate the use of the process based on the preliminary metallurgical test work conducted on the project in June.

The study has 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.

Both the firms are discussing on the bench-scale work, column testing and a demonstration test plant designed to further test the application of the AmmLeach process.

The adoption of heap leaching would eliminate the need for milling, agitation leaching equipment and solid-liquid separation.