PROSPECT LA FE
Concession application in the northern end of the Serrania de San Lucas, located
in the southern central part of the Department of Bolivar, Colombia. The concession block totals 6974.49 hectares.
The San Lucas Trend covers an area of land more than 100km in length and 30km
wide. The trend runs in a NE to SW direction.
Geology is of the northern end of the Serrania de San Lucas, of the Central
Cordillera, with PreCambrian and Paleozoic metamorphics with Mesozoic batholithics, intrusives, volcanics, and sediments.
Artisanal gold production is taking place in the northern end of the Serrania
de San Lucas from ore in the oxide zone within systems of epithermal precious metal mineralization.
Potential economic deposits in prospect La Fe include epithermal
and mesothermal precious metal veins and stockworks, alluvial gold and clays.
The San Lucas Range corresponds to the northern most part of the Colombian Central Cordillera. Geologically
it is composed of three major units: 1) a metamorphic basement represented by gneisses, and secondarily by migmatites, amphibolites,
and granulites; (2) diorites and granodiorites which belong to a batholitic dimension which intrude the metamorphic rocks;
and, (3) volcanic sedementary rocks in stratigraphic contact with the metamorphic rocks, principally composed of ignimbrites,
volcanic breccia, acidic intermediate lavas, bombs and ash and lapilli flows, intercalated with layers of chert.
Cutting these units are veins with a high
gold content. These veins are mainly characterized by: (1) systematic occurrence with structural controls in which the veins
cut the lithology (crystalline basement and platform cover); (2) formation/deformation environments associated with transtensional
processes in brittle and brittle ductile regimes; and, (3) geometries compatilbe with progressive deformation related to regional
main vein systems are controlled by preexistent or precursor joint/fault systems. The direction of these systems are N5 -
20° E and N55 - 70° E. At the moment these vein structures were formed, they were favorably oriented to the opening/filling
of the mineralized fluids. The first system belongs to the NNW structural domain (contemporary in time with the extensional
structures) and it represents vein deposits similar to the La Gloria gold vein. The second system belongs to the NWW domain
(or of dislocation, contemporary to late, in time, to the extensional shear structures) and represents deposits similiar to
the La Mariana gold vein, which are characterized by reactivation associated to shear in contact with the host rock.
These vein domains were subsequently affected
by tectonic dislocation processes, with strikeslip (sinestral) and dip (extensional) movements, represented by NW - SE structures
above information was taken from an article (Ambiente Estructural De Los Depositos Auriferos De La Serrania De San Lucas (Bolivar,
Colombia)), published by the Universidad Nacional de Colombia in the Boletin de Ciencias de la Tierra.
Published accounts of a study performed by the Gamma Group of the National University at Medellin, for the area of San Martin and Barranco de Loba mining districts, reports the local
geology as follows:
The San Lucas range is the northern
most part of the Colombian Central Cordillera; although geologically speaking it belongs to the western
part of the Chibcha Terrain which is composed mainly by the Eastern Cordillera.
The basement is composed of metamorphic, granitoid
and volcanic rocks. The metamorphic rocks are mainly pink feldspar rich migmatites and gneisses and basic
hypersthene bearing granulites, partially retrograded to amphibolite facies. This is the first reported occurrence of such rocks in the area. Although radiometric datings are not presently
available, it is reasonable to suppose that they are Precambrian, with an age similiar to that found in
the Mylonitic Gneisses of El Vapor (near Puerto Berrio), with an Rb-Sr isochron age close to 900 Ma, although
they could be older. They probably belong to the Grenvillian granulitic belt that extends from the Sierra
Nevada de Santa Marta to the Garzon Massif. The retrograde even may be younger.
rocks are batholitic bodies that intrude the metamorphic rocks. Their composition ranges from diorites
to granodiorites, their age is unknown, but tentatively they can be correlated to other large intrusive
bodies in the Chibcha Terrain that are Jurassic in age.
The volcanic rocks are composed
mainly of basalts and andesites with intercalations of tuffs and ignimbrites, which have been strongly
Multiple gold-bearing mineralizations
(epithermal and mesothermal) are found as veins in the different basement rocks, making the zone a major
exploration target for gold deposits.
*The above information was taken
from an article (Rocas Metamorficas De Alto Grado En La Serrania De San Lucas), published by the Universidad
Nacional de Colombia in the Boletin de Ciencias de la Tierra.
|Geology and Geography of the Area
Geologic studies of the Colombian Geologic Institute (Ingeominas) have detailed the location of both Molybdenum and Boron
deposits located in Mining Concession IFD-11271.