El Dovio Metallurgy Recovers Over 96% Gold and Copper

VANCOUVER, BC - Colombian Mines Corporation reported recoveries of 96.4% of the contained gold, 97.8% of copper, 91.1% of silver and 96.8% of the zinc in metallurgical tests on mineralization from the Sabana Blanca zone at El Dovio in Colombia. McClelland Laboratories, Inc. of Reno, Nevada supervised and conducted the tests using conventional milling and froth flotation techniques.

Flotation tests were conducted on a bulk composite sample with an average grade of 5.3 grams per tonne gold (g/T Au), 4.7 grams per tonne silver (g/T Ag), 0.86% Copper (Cu) and 1.12% Zinc (Zn) from the Sabana Blanca tunnel at El Dovio. A map showing the Sabana Blanca tunnel and simplified project geology and geochemistry.

The sample was treated using standard froth flotation methods after stage crushing and grinding to 80% passing 75 microns (200 mesh), a prevalent grind size in modern mills. The sample was selected to characterize mid to low grade, high sulfide, gold - copper mineralization typical of known mineralization at El Dovio. Samples of unoxidized, unweathered mineralization in the Sabana Blanca tunnel ranging from a depth of 3 to more than 30 meters vertically below the surface were specifically selected for the composite sample to more accurately represent the character of mineralization expected throughout the bulk of the system because heavily oxidized surface samples have potential to yield inaccurate and misleading metallurgical results in flotation tests.