The area is located in the northeast sector of Puntas del Yerbal photo plan (E-18), southeast of photo plan C° de las Cuentas (E-17), southwest of Arbolito photo plan (D-17) and northwest of Parao photo plan (D-18.) Access is from highway Number 8, kilometer 342, taking the minor road to the west. To access the area of study through the north-center area you cover about 24 kmts.

GK coordinates from the central area are: E 633500 - N 6378400. The area affected by the permit involved (1502/10) is of 1410 hectares, corresponding mostly to the 4th Judicial Division and cadastral department from Treinta y Tres and a smaller proportion to the 10th division of Cerro Largo Department. Figure 3 shows the location and access to the area in the aforementioned 1:50.000 scales. They correspond to Uruguay's National Cartographic Plan created by the Military Geographic Service of that country.

Predominant lithologies are pelites and siltites in all the area, affected by low to medium grade metamorphism. Secondly, limestone, shown in Figure 4, dark gray-blue to light gray, of fine grain, with silica impurities in centimeter horizons. From the point of view of texture these limestones have fine granulometry; medium to high purity with banded composition defined by color changes and well defined stratification. Banding is given by millimeter plates rich in quartz, immerse in centimeter bands of carbonate. Locally, they are gently folded and alternated with metasandstones.

A fracture with NS and N45E direction has a moderate expression, probably returning to old directions of infrastructure basement foliation observed a few kilometers to the west of the area studied.

This project is located largely within the north-center area of Isla Patrulla photo plan (E-19). It is accessed through highway No. 8, kilometer 307, taking the minor road to the west. You cover about 14 km to access the area of study through the east-center area.

GK coordinates from the central area are: E 620300 - N 6352800. The area affected by the permit involved (tenement 682/08) is of 3995 hectares, corresponding to the 4 th and 5 th Judicial and Cadastral Division from Treinta y Tres Department. Figure 5 shows the location and access to the area in the aforementioned 1:50,000 scales, corresponding to Uruguay's National Cartographic Plan prepared by the Military Geographic Service from that country.

The area topography is undulating to strongly uneven with low coverage of soils and medium to high density of outcrops. The use of the land is mainly for livestock.

A set of metamorphic lithologies and ortho-derivative for low grade, deformed and folded were defined in the area studied which according to their gradation would form part of a proximal type platform sequence.

Carbonated rocks, limestones sequences, are widespread as can be seen in Figure 6. They have very fine grain, with dark-blue colours, and equigranular texture. Compositional banding is marked with color changes and millimeter film layers rich in quartz-rich, embedded in carbonate bands every 2 to 5cm. There is occasional presence of oolitic type structures, which reveal its sedimentary origin.

All rock sequences present a medium grade metamorphism. The predominant fault continues to be N45 and dips are generally vertical to sub vertical in calcareous packages. Sometimes it is common to find gray limestones with medium and coarse grain, well bedded, alternating brownish limestones intensely folded, with dips of 30 ° to 40 ° with northwest direction. Sometimes metamorphic schists with tensions of 50 cm alternate which lowers dips to 25 ° approximately.

Isla Patrulla Sur Project, at a distance in straight line of about 25 km northwest of Treinta y Tres city is the closest to the locality of the 3 projects presented in this report. Most of the area is located in the south-center area of Isla Patrulla photo plan (E-19), and a small area to the south of the permit corresponds to the north-center area from Treinta y Tres photo plan (E-20). Access is through Treinta y Tres city taking highway 98 with northwest direction and you enter the area of study in kilometer 21.

GK coordinates from the central area are: E 616100 - N 6337900. The area affected by the permit involved (Tenement 2966/10) is of 4900 hectares, corresponding to the 1 st and 5 th Judicial and Cadastral Division from Treinta y Tres Department. Figure 7 shows the location and access to the area in the aforementioned 1:50,000 scales corresponding to the National Cartographic Plan created by the Military Geographical Service.

Topography of the area is rough, with sedimentary sequences of rocks ortho-derivates, with low grade, deformed, covering almost the entire area of study, highly folded and deformed.

Sequences of limestone rocks have N30-N45 direction, sub vertical dip to the northwest. These packages show tension in depth.

Fine-grained limestones are dark gray, with equigranular granoblastic texture, and some impurities. Folds of metric tensions were observed with presence of metallic material in hinge areas and locally levels rich in silica up to 10 cm. They show characteristics of ductile-ruptile deformation where there if flow of less competent portions with brecciation / boudinage of more competent portions. They show calcite in millimeter veinlets. Generally they show scarse dolomitic levels.