The Property lies within the southeast margin of the Sunsas Mobile Belt of the Bolivian Precambrian Shield, in a region characterized by highly deformed and metamorphosed Lower Proterozoic rocks of the Aventura Complex. The Property covers a series of northwest trending schist belts (Cristal Sequence), orthogneiss (Patuju Domain) and a granite intrusive body within an area of approximately 25 km east west by 25 km north south.

The schist belts are part of the Cristal Sequence, which is characterized by a mixture of highly metamorphic assemblages of phyllites, psammites and quartzites with relatively minor calc silicate and ferruginous units. All are inferred to be metasediments that were folded and regionally metamorphosed to medium to high grade at about 1,350 Ma during the San Ignacio Orogeny.

Four schist belts were mapped on or near the Property. The two northern schist belts, the Eastern Schist Belt, also known as the Las Tojas Schist Belt, and the Cristal Schist Belt, are approximately 5 km apart and bounded by Patuju Domain orthogenesis. Both of these belts are part of the Aventura Complex. The two southern schist belts are south of the Property. They are unnamed and are bounded by paragneiss of the Patuju Domain. The dominant structural trend is northwest.

The northwest trending Cristal Schist Belt is approximately 25 km in length and up to 4 km in width. It is composed of steeply dipping metamorphic strata, and hosts the LMZ and UMZ, as well as the Cerro Felix, Don Mario North, and Don Mario South gold prospects. The Eastern Schist Belt, which hosts the Las Tojas Mine (deposit), is narrower, generally less than 1 km in width, but more than 40 km long.