OVERVIEW

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San Gregorio

The San Gregorio deposit has historically produced in excess of 400,000 ounces of gold from two open pit deposits down to approximately 200 meters vertical depth. In fiscal 2010, it is expect to produce 55,000 - 57,500 ounces. The remaining in-situ resource of 8 million tonnes at 1.04 g/t for 270,000 ounces gold lies mainly along strike to the west and at depth between the two pits. Approximately 70,000 ounces of this resource is planned to be mined from the final cutback of the San Gregorio pit.

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San Gregorio system has produced close to 1,000,000 ounces from open pits to 200m depth.
Two main open pits, Arenal and San Gregorio and processing plant.
Exploration targeting continuation of Arenal and San Gregorio open pits at depth to define underground resources

A drilling program has been designed to extend the current resource down dip to approximately 400 meters vertical depth, infilling where required to identify the higher grade shoots along a mineralized strike of one plus kilometers. The goal of the program is to identify a higher grade core of mineralization adjacent and below the existing pits that, like Arenal Deeps, will be of sufficient grade to justify a second underground ore source.

Note: OMI has operated the San Gregorio mine since 1 October 2003.

Additional information on operations, including mining method and equipment, process flowsheet and flowchart, infrastructure and services and laboratory can be found in the following pdf document.