Management of DIOS EXPLORATION (TSX VENTURE:DOS) has announced the discovery of in situ gold in outcropping tonalitic rocks, a gold porphyry type model mineralization.
DIOS systematic research and sampling of glacial terranes for heavy minerals lead to this discovery located within 5 kilometers from an access road, following the 2010 work on the main gold glacial till dispersal train at the wholly-owned diamond-gold U33 West project, Opinaca-Eastmain 1 area, Quebec, in the region of the multi-million ounces of gold Eleonore deposit.
In 2010, a till gold train led to four tonalite floats (40-100 cm) with 1 to 5% disseminated pyrite assaying 2.3 g/t Au, 0.74 g/t Au, 0.84 g/t Au and 2.3 g/t Au, respectively. About 400-500 meters north of these goldbearing floats, discovery of outcropping hematitized tonalite returning 2.2 g/t Au, (injected by cm quartz veinlets with traces of pyrite) confirms one of the possible sources of the till anomalies. In addition, multiple in situ gold sources are further considered as 9 anomalous glacial sand samples (from 0.4 to 2.09 g/t Au) are located up-ice some 3 to 10 kilometers further away from the auriferous outcropping tonalite. This fall, 46 additional till (glacial sands) samples were just collected (including 16 samples along this particular gold train). This sector is underlain by a geology mostly composed of tonalitic rocks. The tonalite is generally medium to coarse-grained and contains 15-25% mm quartz phenocrysts and 5% mm potassic feldspar phenocrysts. Dios magnetic data shows a well-developped set of NNW-NS lineaments that cross-cut the tonalite in this target area.
Reconnaissance field work has also outlined a plurimetric-wide east-west sheared zone at the contact between the tonalite pluton and altered mafic metavolcanics. The volcanics are altered in chlorite-actinolite-biotite-garnet with traces to 3% sulfides (pyrite-pyrrhotite-chalcopyrite-molybdenite-arsenopyrite?). They are also injected by two generations of veins: metasomatic chlorite-epidote-potassic feldspar cm-dm veins and late tension tourmaline-quartz & tourmaline mm-cm veins. The tonalite is variably altered with quartz and tourmaline (locally up to 15%) and is injected with 3-5% tourmaline-quartz-feldspar stockwork or veinlets.
A gold porphyry target is now considered for this area; such mineralization type is known elsewhere in the Eastmain-1 region. Another small (7 x 2 km) tonalite plug in contact with mafic volcanics is also located further up-ice, where stops the gold till train.
This fall, work was also carried out on the eastern part of the U33 property where 2010 sampling had returned up to 37 and 24 g/t Au as well as 54 and 53.4 g/t Ag (conductor showing). A 40 km-line grid was cut and was surveyed by Induced Polarization. Prospecting-mapping was also completed on the grid and 210 samples were collected and sent for processing to ALS-Chemex Val d`Or laboratory, assays pending
The large U33 project encompasses two NTS map sheets about 350 km northeast of Matagami. In the vicinities of Eastmain-1 hydro-complex, DIOS previous sampling of glacial terranes outlined a 15 km x 3-7 km well-structured gold NE anomalous dispersal train composed of 47 till samples averaging 0.48 g/t Au including 7 samples (15%) over 1 g/t Au: 1.085, 1.13, 1.255, 1.39, 1.60, 1.75, 2.09 g/t Au (heavy mineral concentrates).
The technical content of this press release was prepared by Harold Desbiens, M.Sc., P.Geo, Qualified Personspursuant to National Instrument 43-101.