Quinchía mine

The Quinchía mine is a gold mine in Colombia. The mine is located in Quinchía, Risaralda. The mine has estimated reserves of 390000 oz of gold and 817000 oz of silver. In 2016, Quinchía produced 73475.73 kg of gold, and 10587.99 kg of silver.

Description
The Quinchía Project, covering an area of 1407.43 ha, encompasses multiple porphyry gold target centers that have been early stage drill tested in 2006. Three historic Miocene intrusive centers have been identified, spaced out over a 3 km north to south strike, and are at elevations between 1600 and 1950 m. These intrusive centers are composed of dykes and stocks emplaced in intermediate to felsic volcanic rocks of the Miocene Combia Formation and in Cretaceous basalts. All target centers host gold and copper mineralization.

The volcanic member of the Combia Formation is predominantly composed of basaltic and andesitic leaks, volcanic breccias and porphyry deposits of andesitic to dacitic composition. The mineralizations occur in porphyry veins in the andesitic sections without visible hydrothermal alterations.

Two types of structures are present; parallel veins with a 065-075 strike dipping 58 degrees to the west with variable thicknesses between 5 and 10 cm and a principal vertical vein that is east–west oriented and between 0.8 and 2.25 m thick. These veins are mainly composed of quartz, chalcopyrite, pyrite and sphalerite. The average gold concentration is 20 to 30 mg/kg with zones up to 800 to 1000 g of gold.

Additionally, a 1997 study performed by the ICP, revealed concentrations of more than 1000 ppm of copper, lead and zinc. The observed mineralizations suggest that they are related with a contact zone of porphyric intrusions into the Combia Formation and constitute fractures filled by fluids at a later stage.