The Catfish is located 28 miles NE of The Catfish municipality, Antioquia department, including the village of Tupe (Figure 1) and the sector Pisingos. The Sandy pathway on the eastern flank of the Central Cordillera.

Access from the town of Catfish can be done by aerial means arriving at the airport Tomin, and the area of interest is reached by a river trip (50 min) and mule (1.5 hours) on mules.

The mining concession is located on the eastern flank of the Central Cordillera. In this sector two geological domains limited by Falla Otú known as land Tahami and Chibcha (Restrepo and Toussaint, 1988), Tahami field, west of the Otu fault consists of gneisses quartz-feldspathic and aluminous, and shales are recognized Green and moscovíticos grouped Cajamarca Complex (Maya and González, 1995). The zircon radiometric ages indicate an orogenic event during the Late Triassic, in the case of Neis of metamorphism on tax Nechí 236.6 + 4.4 Ma (Restrepo et al, 2011) shows The Chibcha ground east of the Otu fault, consists of quartz-feldspathic gneisses, amphibolites and Precambrian marbles grouped in the unit known as Gneiss San Lucas (Clavijo et al, 1995). The age of metamorphism is considered by comparison with Proterozoic Neises Tierradentro and amphibolites dated 1360 + 270 Ma (Gonzales, 2001) These rocks are intruded by the so-called Segovia Batholith, of Jurassic age, an elongated north-south body, consisting of diorite, with extensive textural and compositional variations diorites, gabbros and granodiorites. The rocks belonging to this unit generally have a high degree of weathering. Commonly presents basic and siliceous dikes intruding the Batholith. Locally mylonitization shear zones with predominantly NS (Londoño et al, 2009) are presented. The age of this body is 170 + M.A. (Feininger et al, 1972 in Gonzales 2001)

Traditionally there has been a strong alluvial mining activity related to the Cauca, and Tigui Nechí rivers and mining this vein being much less developed. Londoño et al (2009) identified in the mining district several vein systems, separating them into two sectors: one near Nechí north and a southern area near the Catfish and Zaragoza.

According to these authors, in the Zaragoza The Catfish and two sets of veins are recognized:

• Veta La Ye. With address 340/52 SW and average thickness of 1 m, has areas of thinning. It is embedded in a composition tonalitic intrusive cut by a series of acidic medium grain dams aphanitic andesite latter stationed where post-mineralization failure.
• Veta El Carmen: available with 5/45 SE with an average thickness of 1.2 m, embedded in a granite body called Stock del Carmen, composed mainly of quartz, feldspar and biotite altered to chlorite.

Geominas SA reported the existence of two mineralized zones present in the Segovia Batholith with apparent structural control. The first related to the metamorphic foliation litodema located towards the center of the mining title, N55E/40SE general structural arrangement consisting of quartz veins with free gold prospect to the La Sandy. The second zone of mineralization has a general provision heading N45W with variation in dip direction between 25NE-50SW, mainly associated with siliceous dikes considerable power with the presence of free gold.

The mineralization is associated with vein structures of varying thickness and orientation. It has identified several quartz veins that have been subject to illegal exploitation, and / or outcrops where the samples have yielded higher values of Au detection limit. In Pisingos area in a sector with illegal mining activity, a vein was observed with thickness less than 1 m, the arrangement in depth (20 linear meters in tunnel) is N38E/9W; shows the grain galena mineralization, oxides and reddish (not visible) free gold in quartz, as well as accessory mineral pyrolusite. The vein is embedded within a strongly altered towards the contact area, where orientation of the mineral is observed at the grain direction parallel to igneous rock diorite. Locally host rock xenoliths are observed, and in some cases the host rock acquires a brechoso appearance. Overall, the vein is massive milky quartz with timely oxidation related to the alteration of sulfides present

It has identified at least 4 quartz veins with sulphide mineralization (pyrite and galena) whose arrangement varies direction (Figure 10) and dip. Of these veins have two N70W direction, one direction N39E and N70E direction.