VANCOUVER, BRITISH COLUMBIA -- (Marketwire) -- 01/21/13 -- Prospero Silver Corp. (TSX VENTURE: PSL) ("Prospero" or the "Company") is pleased to announce the results of 360 rock chip samples obtained from the Petate West and Petate East target zones of its 6,000 hectare El Petate project. The Apartadero target is part of the Petate West zone, measuring 1.3 km long and up to 200 meters wide and has shown the most anomalous gold geochemistry to date in jasperoid outcrops and float. Mapping of the Petate West zone shows northwest and east-west trending silicified zones associated with andesitic dikes with the same orientation (Figure 1). Mapping and sampling have to date identified the La Escoba, Apartadero and and Tecolotes silicified reefs. Other as yet unmapped reefs are anticipated west of the Apartadero reef and in the southern extension of the Petate West zone (see attached maps). The property boundary lies outside the area of the figures.
The highlights of the Apartadero geochemistry include:
-- Assays in the range of 1 to 6.62 ppm Au occur along a length of 500 meters in the southeast extension of the Apartadero target. The geochemical values are presented over subdued geology.-- These expand to a length of 1100 meters for assays above 0.1 ppm Au (see Figure 2);-- The silver geochemistry in the Apartadero trend exhibits anomalous values between 1 to 6.4 ppm (Figure 3).-- Multi-elemental pathfinder geochemistry revealed elevated mercury, arsenic and antimony anomalies associated with the precious metals. 1. Mercury with values between 10 ppm to greater than 100 ppm is closely associated with the higher gold geochemistry (Figure 4); 2. Antimony geochemistry also closely follows gold values, with the higher values in the 100-400 ppm range concentrated in the southeast sector of the Apartadero target area; 3. Similarly, arsenic values above 100 ppm follow the gold anomalies, and exhibit a hot spot in the Apartadero area, where the highs mostly range from 100 ppm to 400 ppm;-- Other elements such as barium are also high in the Apartadero area with highs ranging from 1000 ppm to 10,000 ppm.
While the Apartadero geochemistry is highly anomalous in gold in its southeast extension, the data to date from the Petate East geochemistry is showing proportionately higher silver geochemistry as follows:
-- The Petate # 1, #2, and # 3 targets, in the eastern zone of the project area, exhibit higher rock-chip silver geochemistry with assays commonly above 50 ppm (Figure 3);-- Higher iron and manganese geochemistry is associated with the Petate East targets with anomalous values in the single to double digit percent range.
Other Target areas.
La Escoba areas in the northwest portion of the district is divided into Escoba North, Escoba Central, and Escoba south silicified trends. These are characterized by more subtle precious metal and pathfinder-element anomalies, with gold highs in the 0.1 to 1 ppm range, silver highs under 5 ppm, and mercury highs under 5 ppm.
The Tecolotes area in the southwest sector of the district also exhibits significant highs in Au-Ag-Sb-Hg-As (Figures 2 to 4).