Summary
To access the project area we use the main road called Troncal de La Paz that connects the center of the country with the Atlantic coast, this is taken from the city of Medellin to reach the municipality of Caucasia takes the Caucasia El Bagre road, there it is necessary to take fluvial transport on the Nechí river, to the Rio Sucio path in a journey of approximately 1 hour, then a journey of approximately 2 hours in beast in a 6.2 km route to reach the study area. With the exception of the backbone, and a section of the Caucasia road, the catfish, all the roads are uncovered, from regular to poor state of conservation with narrow sectors. Within the project area there are some penetration routes of very poor specifications and conditions that serve the locals to transport themselves internally.
No Longer Available
Location and Access
The contract area HGI-08077 is located in the villages of El Tupe and Arenosa, jurisdiction of the municipality of El Bagre, in the northwest of the Department of Antioquia. It has an extension of 1743.7765 Ha, comprised by a polygon of irregular shape, elongated in NS direction, with about 6 km long and wide of 3.936 km, which narrows towards the South up to 2 Km. The vertices of the definitive delimitation of the polygon of exploitation correspond to the same contract and are indicated in Table 2.1
North Coordinate Point East Coordinate
1 1361000 925064
2 1361000 929000
3 1355000 929000
4 1355000 926991
5 1357085 927085
6 1357129 926044
7 1359124 926094
8 1359142 925045
Description
EXPLORATION PROGRAM
The exploration program of Bacata Resources aims to estimate Inferred and Indicated Resources of the alluvial deposit as well as determine the strike, width and continuity of gold veins along with estimate Resources at Measured and Indicated (MI) levels.
For the alluvial deposit, the exploration program was designed to determine the hydrological features of gold mineralisation and delineate the occurrence of high-grade gold nuggets along the river course. The exploration consists in several pits (30 to 45) equidistantly distributed along the riverbank. The dimension of each pit is estimated to be nine square metres on surface and reach one to two metres deep; however, changes in the configuration may occur depending on field observations and accesses.
Programmed drill holes for gold veins exploration will be concentrated in the central part of the tenement. The drilling campaign encompasses between 33 and 60 sub-vertical and inclined Diamond Drill holes (DDH) with an average deep of 167 metres; thus, it is programmed that the drilling exploration campaign of Bacata Resources totalises between 5,500 and 10,000 metres as minimum and maximum sampling, respectively. However, the length of the entire drilling program will be determined by the geological and structural features of the deposit and market drilling cost.
The drilling program distribute all DDH along the strike of veins suggested by SRK to determine the geological and structural features of gold veins to obtain an accurate estimation of MI Resources. To assure the accuracy and precision of Resources estimation, the campaign was designed to do not surpass 200 metres distance between drill holes, which is is a standard value used to estimate MII Resources in similar gold veins deposits.
Details of the exploration program for each type of deposit is depicted in Table 1 that shows the pit sampling and drilling program of each deposit. Cost details for alluvial and vein exploration campaigns are depicted in Table 2 and Table 3, respectively. Figure 1 shows the distribution of exploration pits along the riverbank and Figure 2 depicts the distribution of suggested drill holes to intercept the intrusive formation.
El Bagre Project is a Gold exploration target located in Antioquia Colombia within the Cauca and the Segovia belts where the main gold deposits are placed. The tenements extend for 7,013 hectares along the occidental side of the course of the Nechí river (Figure 1) being neighbour of Mineros S.A. (Figure 2), one of the largest gold producers in Colombia which extract gold from alluvial and gold veins deposits.
Alluvial deposits within the tenements of the project are evidenced by documented artisanal gold extraction activities in the area, gold veins deposits are denoted by quartz and gold alteration found in formal surface sampling and drilling exploration campaigns.
Geology
The project is underlain by the Ordovician-aged Cajamarca Complex consisting in heterogeneous sequences of schists and granite intrusion. The Cajamarca Complex has a northeast faulted contact against a younger Jurassic-aged diorite intrusion which is known as the Segovia Diorite (Segovia Belt or Batholith of Segovia). The fault is known as the Out fault and has been interpreted as having a component of sinistral sense of shear.
The Segovia Diorite is mostly comprised of diorite, granodiorite, tonalite and gabbro. These rocks commonly exhibit strong saprolitic weathering. Quartz veins containing gold in the area of El Bagre Project are hosted by these units (Álvarez, 1983; González and Londoño, 2002).
Montoya et al. (2010) noted that the main characteristic of the Segovia Diorite is its banding texture hornblende oriented which might indicate a protoclysis phenomenon affecting the igneous structures during the intrusion of magma. Placer alluvial deposits are also found in the region where metamorphic rocks are characteristics for a discordant contact with volcano-sediments from the Jurassic-Cretaceous and lithologically associated to the batholith of Segovia (Brexia Resources, 2012).
Mineral resources of the region correspond to precious metals, which are extracted from alluvial of veins deposit types noting that the Segovia Diorite allocates some of the most important gold veins of Colombia (Zapata et al. 2013). Londoño et al. (2009) stated that vein structures have the following characteristics:
• Mainly embedded in metamorphic rocks (neises and migmatites)
• Compounded by quartz and pyrite mineralisation and can also contain galena and fine grains
• Average thickness of 1.5 metres
• Extension of 2.0 to 3.0 km
• Predominant orientation N25E with dip varying between 30 and 40° NW
Gold Veins Mineralisation
Large portion of the gold resources and reserves are found in vein (lode) deposits which are considered hydrothermal deposits because the mineral species which compose the veins were precipitated by hot waters.
Veins are commonly grouped in sets. When various discrete veins with similar characteristics are clustered in the same area the deposit is referred to as a vein system. Vein systems can hold impressive amounts of valuable minerals and many ore deposits of economic importance occur in veins.
Most often, vein hosted gold is invisible to the unaided eye as it is found along with quartz, sulphide minerals, calcite and various clay minerals. Veins range in thickness from a few centimetres to four meters; they can be several hundreds of meters long and extend to depths in excess of 1,500 meters. Mineralisation commonly occurs in shoots within the vein structures.
History
• Located in the Segovia Belt. A geological region where alluvial and hydrothermal gold veins deposits are currently under production regime (ie. Mineros S.A.)
• Evidence of gold veins through drilling (DDH), surface sampling and structural simulations.
• Potential gold veins resources have been detected and modelled by SRK and Snowden.
• Drilling sampling (DDH) shows that potential sets of veins can extend from 1 to 10 metres @ 10 to 20 g/t
• Similar deposits have been found and exploited in South America by Yamana Gold (El Penon, Mina Florida) and Brio Gold Inc. (Pilar Mine)
Additional Information
www.elbagregoldmining.com
