DIOS: Gold, Copper and Silver Discovered in Tonalite Rocks on 33 CARATS
07 Dezembro 2011 - 8:55AM
Marketwired Canada
For the first time, gold is discovered in rocks on 33 CARATS diamond project of
DIOS EXPLORATION (TSX VENTURE:DOS), Upper Eastmain River area, Quebec, within
targeted tonalitic intrusive rocks : six samples returned values of gold, silver
and copper up to 3.18 g/t, 18 g/t and 1.22%, respectively. See table below for
more results. Detailed geological mapping by DIOS some 5-10 km northwest of the
volcanic hosted Eastmain gold deposit helped define a 2 by 6 km tonalitic phase
specifically targeted for its gold potential in the western part of a felsic
pluton around which is wrapped the Eastmain Greenstone Belt. The mineralized
(1-2% pyrite) sicilified tonalite glacial float samples were collected up-ice of
a glacial gold train in till. Boulders are angular and their size suggest an
outcrop source within 2 km, where tonalite was mapped, and not in the eastern
part of the property further away where granodiorite was mapped.
Gold mineralization in tonalite boulders correlates with significant values of
copper and silver, and related values in bismuth, an indication of porphyry type
deposits. An anomalous gold bearing outcrop was also discovered, with high
exploration potential in the surrounding one km or more radius. DIOS considers
these results very significant as it indicates that this part of the eastern
Eastmain volcanic belt has a potential for a copper-gold porphyry deposit
related to the synvolcanic Lac Erasme pluton. The Otish road towards Renard
diamond deposit will go through DIOS' property, 1-2 kilometres east of the main
gold potential area.
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Rock sample description Gold Silver Copper Bismuth
(g/t) (g/t) (%) ppm
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Sub angular boulder, 2 x 2 x1m,
moderately fractured, felsic volcanic,
20-30% mm QZ porphyric crystals, 2-3%
BO, 5-10% rusty QZ veinlets, non-
magnetic, 2-3% PY-CPY 3,18 9,5 0,16 13
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Boulder 1.5 x 1.5 x 1 m, medium grain
tonalite, QZ(35%) - PG(30%) - BO(35%),
1-2% QZ veins, moderately foliated,
strongly magnetic, altered:
biotization-silicification,
disseminated 2-4% CPY, traces PY 1,32 18,0 1,22 19
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Boulder 1 x 0.5 x 0.5 m, medium to
coarse grain tonalite, QZ(35%) -
PG(35%) - BO (30%), strongly foliated,
altered, magnetic, 20-30% mm QZ veins
developed in foliation, alteration
comprises biotization, hematization and
silicification, disseminated 1-3% PY 1,97 1,8 nil 3
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Angular boulder 4 x 4 x 2 m, medium to
coarse grain tonalite containing a 2-3
cm rusty QZ vein, QZ(40%) - PG(40%) -
BO(20%), magnetic, disseminated traces
PY 0,95 1,7 0.07 2
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Sub angular boulder 1.5 x 1.3 x 1.1m,
medium to coarse grain tonalite,
QZ(40%) - PG(30%) - BO(30%), moderately
foliated, non-magnetic, alteration
comprises BO veinlets, carbonatation
and silicification, disseminated 3-5%
PY-CPY and patchy MC 0,42 8,6 0,64 9
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Sub angular boulder 4 x 4 x 5 m, medium
to coarse grain tonalite, QZ(40%) -
PG(30%) - BO(30%), non-foliated,
strongly magnetic, alteration comprises
biotization and silicification,
disseminated 3-4% PY-CPY 0,29 1,8 0,13 nil
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QZ: quartz, BO: biotite, CPY:
chalchopyrite, PY: pyrite, PG:
plagioclase feldspar Gold Silver Copper Bismuth
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Siliceous and biotitic alteration affects most samples. Carbonatation is
sometimes observed. Mineralization consists of disseminated pyrite,
chalchopyrite and malachite within rocks but also in rusty quartz veins.
Sulphide content varies between traces and 5%. Mineralization and alteration
types combined with the important till gold train suggest a real potential for a
large copper-gold porphyry system that could be the source of the goldbearing
boulders found during the 2011 campaign.
Gold values above 50 ppb were returned from 13 samples out of 154 sent to
analysis, 10 of them were taken in metric sub-angular to angular blocks of
felsic intrusive and 12 samples, including one outcrop, are located in the till
gold train The highest gold assay returned 3.18 g/t from a volcanic felsic
block. Only one anomalous sample comes from an outcrop of tonalite. Three
auriferous boulders are found in the vicinity of this outcrop. Six samples
returned sub-economic to economic values of gold, silver and copper up to 3.18
g/t, 18 g/t and 1.22% respectively.
A one week prospecting program was completed over a tonalite (granodiorite) plug
and adjacent volcanics up-ice of a glacial auriferous train (glacial till gold
anomalies incl. 2090, 1165, 583 and 519 ppb gold in heavy minerals concentrates)
and a total of 57 outcrops were mapped of which 48 were sampled. Moreover, 90
mineralized boulders were sampled and samples sent to Val d'Or ALS CHEMEX
laboratory and assayed for gold (AA23) and multi-element package (ME-ICP 41),
with fourteen (14) blanks.
The technical content of this press release was prepared by M.J. Girard, 43-101 QP.
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