Montaña de Oro is in southern Sonora near the border with Sinaloa state.

It lies 15 kilometres to the southeast of Pan American Silver Corporation’s Alamo Dorado project and 30 kilometres south on trend from Palmarejo Gold’s Trogan project.

Until 2004, the 93 square kilometre property was held as a National Mineral Reserve when it was won in auction by Sydney Resource.

Recent drilling and geophysical analysis is the first conducted on the property in its history.

Montaña de Oro hosts a variety of styles of mineralization including epithermal gold, gold-silver, and porphyry copper-gold.

In total there are thirteen known mineralized occurrences. Only one of these has ever been drill tested.
There are five identified epithermal systems on the property: El Rodeo, Montaña de Oro, La Fronteriza and La Violeta and El Zataque. These occurrences define a six kilometre long by two kilometre wide north-south oriented corridor of gold and silver mineralization within the western half of the project area.

The La Concepcion copper-gold and La Dura base metal zinc-lead-gold occurrences are part of a large porphyry related system on the western half of the property.