The Amantina property extends to the north and south of Vena’s San Antonio de Esquilache property. The property consists of 18,900 hectares in 23 mining concessions and is located in southwestern Puno Department approximately 45 to 65 kilometres southwest of Puno city. Access is via the towns of Juncal and Laraqueri.

The concessions were acquired by Vena Resources following a regional reconnaissance evaluation of a series of Miocenene-Pliocene calderas centered on the historical San Antonio de Esquilache silver mine. A number of alteration zones, mineralized structures and a complex diatreme centered breccia were identified on the property. In 2010 Vena and Gold Fields Peru formed a joint venture to continue exploration of the concessions. Gold Fields is operator of the JV and is spending US$ 1.5 million to earn a 51% interest in the property.

Four calderas have been identified in the area that from south to north are Chapi Chiara, San Antonio de Esquilache, Amantina and Millo. Gold Fields has studied eight alteration/ mineralization zones associated with the calderas and has prioritized two for immediate detailed follow up including geological mapping, close-spaced rock geochem and geophysical surveys (ground magnetic and IP).

Chapi Chiara – a large zone of silica-clay alteration with anomalous gold, arsenic and antimony values. Mapping has identified zones of intense silicification (silica caps) and outcrops of vuggy quartz. The target is a high sulfidation gold system.

Virgin de Chapi – two semi-parallel N20⁰W faults located at the southeastern rim of the San Antonio de Esquilache caldera. Both faults have silica-sericite-clay alteration halos measuring approximately 200 metres by 1000 metres with abundant Fe-Mn oxides. Anomalous values of silver-lead-zinc occur along the structures. The faults are approximately 600 metres apart. The target is a structurally controlled low sulfidation Ag-Pb-Zn system.