Two rich silver-gold belts occur on the east and west sides of the Sierra Madre Mountains of Mexico. Santo Domingo is in the Western Silver-Gold Belt.


Santo Domingo mineralization is similar in geometry, geological setting, and size, to that of two major mining areas of the Eastern Silver-Zinc-Lead Belt, namely Fresnillo, with past production of 400 million ounces silver and Zacatecas with 800 million ounces of historic silver production. Two silver mining districts near Santo Domingo in the Western Belt include: San Martin de Bolanos with a past production of 40-50 million ounces of silver, located 65 kilometres north of Santo Domingo and, Bolanos with 60-100 million ounces of historic silver production, 85 kilometres northeast of the Project.