DIOS AU33 West Auriferous Tonalite Samples Strongly Affected by Hydrothermal Potassic Alteration

MONTREAL, QUEBEC--(Marketwire - March 7, 2011) - DIOS EXPLORATION (TSX VENTURE:DOS) just received results from a summary petrographic examination of five auriferous samples from the Au33 West project. The replacement textures described below as well as the abundance of matrix microcline, in association with biotite and the quartz-microcline veins indicate that the AU33 auriferous tonalite samples were strongly affected by potassic alteration. This type of alteration further enhances the porphyry gold type model looked for by DIOS (such potassic alteration is typical of other gold deposits in the Abitibi area).

The examined samples of this recent gold discovery with a petrographic microscope show that they consist in a medium-grained (less than 4 mm) intrusive rock of tonalitic to granodioritic composition that underwent major re-crystallization associated with a pronounced potassic (K) replacement.

Some of the samples show well-preserved primary textures, while others are injected by quartz +/- microcline +/- carbonate veins. All samples show evidences of multiple microcline replacements.

Biotite is present within all samples, in fine-grained and of greenish (kaki) colour. Observations suggest that biotite is partly associated with potassic alteration that is mainly highlighted by the microcline abundance and textures. It forms uniformly distributed granular aggregates that may suggest replacement of primary ferromagnesian minerals. We also observed it in inclusions within the feldspars, as well as locally associated to microcline at the contact between quartz and feldspar-rich matrix. 

The Au33 gold diamond project, is located in the Opinaca area, James Bay, Quebec, some 40 kilometers south of the world class multi-million ounces Eleonore gold deposit. The whole report with detailed photos will be available on our website. 

Technical content of the release was prepared by M.J. Girard, a 43-101 Qualified Person.