Colombia - World Energy Council
the Department of Antioquia, but including small parts of the Departments of Caldas, Cordoba, Risaralda, and Tolima,were investigated during the period 1964-68. The area is designated Zone II by the Colombian Inventario Minero Nacional(IMN). The geology of approximately 45 percent of this area, or 18,000 sq km, has been mapped by IMN.