Eagle Star Reports High-Grade Phosphorite Pit Results at Bomfim Hill

Eagle Star Minerals Corp., is pleased to announce excellent results from Pits 3 and 4 returning 15.42% P₂O₅ over 5 meters and 23% P₂O₅ over 1.5m average grade respectively.

Both pits terminated in high-grade phosphorite and remain open at depth. The XRF results for the four pits excavated to date confirm that the high grade zone at the southern portion of Bomfim Hill (Block D1) extends over a width of 600m between pit 2 and pit 4; the mineralized horizon remains open along strike and to depth. Field work has returned readings of composite intervals varying from 15% P₂O₅ to 23% P₂O₅ over at least 5 meters in thickness in the first three pits and at least 1.5 meters below the 3.5 meters of soil coverage in the fourth pit. All of the pits excavated to date remain open to depth.

Previous grab samples of the brecciated phosphorite found at Bomfim Hill were submitted to SGS Geosol Laboratorios Ltda at their Vespasiano facility in Brazil. The results of the submitted samples confirmed the initial XRF results returning values of 22%-28% P₂O₅ therefore giving credibility to the initial XRF readings. Field evidence suggests the mineralized horizon may extend over an area of 1.1km².

The XRF readings were done systematically following recommended procedures of the manufacturer. The pits have been channel sampled on a meter basis and for each meter, three readings were taken to obtain an average grade. Before running the analysis, the samples collected were homogenized, dried (using microwave oven) and manually crushed to fine grain. The composite grade for the 5 meters is attained by simply averaging the values obtained for each meter. The handheld XRF analyzer is an Olympus Delta model and was calibrated according to Innov-X Systems in-house calibration procedure. The Company conducts field XRF analysis using industry recognized sample preparation and analysis protocols, and has conducted sufficient quality control using the XRF method to believe that although the method cannot be relied upon to have the equivalent precision and accuracy of a certified analytical laboratory, the results are of sufficient quality to direct exploration pending analytical laboratory confirmation.

The information from pit opening in association with detailed mapping (1:10,000 scale) performed in the area has led the technical team of Eagle Star to divide the Bomfim Target (D1) into three mineralized zones to be prioritized and explored accordingly

• SILEXITE ZONE (SZ): The mineralization occurs below a silexite cap at the top of the hill that is at lease 5 meters deep. The silexite rock type is associated with intensely silicified phosphorite as it exhibits a brecciated and laminated texture. This area will have to be drilled in the future due the density of the silexite.
• PHOSPHORITE ZONE (PZ): This zone is located on the hillsides and is composed of high-grade phosphorite, typically brecciated and exhibits a series of textures and facies. XRF results at the southern portion (pits 1 to 4) range from 15% to 23% P₂O₅. Two phosphorite zones have been outlined: PZ-W (west) and PZ -E (east). The work now being performed is focused on PZ-E. This area extends over 1,500m in the NNE direction and 600m in width based on detailed mapping. The XRF results of the four pits confirm the presence of high-grade phosphate mineralization at the southern portion of the mineralized outline with results ranging between 15% to 23% P₂O₅. At the northern portion, the geomorphology and geology are the same as observed at the southern portion. The mineralization appears to occur along a topographic level on the eastern border of the hill, and a structural control (NS and NW-SE faults) appears to influence the width of the high-grade zone. The structural control also supports the presence of paleo channels. (see figure page 3)
• PHOSPHATE SILTSTONE ZONE (PSZ): According to the genetic model developed by Dr. Campos (COO and Director of Eagle Star) for the Itafos Arraias project (now operated by MbAC) located only 10 km to the south of Bomfim, phosphated siltstone should be found next to the phosphorite paleo channels. In this case, to the east of block D1 (block D2) adding even more volume to the phosphorite potential on the Bomfim Hill.

The 150m to 200m spacing between pits at the southern portion of PZ-E permits a good correlation in terms of the rock types present (facies of brecciated phosphorite) and associated grades.

Further investigation at the PZ-E will focus on obtaining spatial distribution of results within a 400m by 400m area at the southern portion of the higher grade phosphate horizon as well as opening additional test pits to the north in order to confirm its on strike continuity.

The mineralized envelope outlined on the west side of the Bomfim hill is also planned for investigation to uncover additional high-grade mineralization.

Source: http://eaglestarminerals.com/