Two Large, Rare Earth Anomalous Areas Defined on Silver Grail's Major Hart Property
11 Mai 2011 - 2:42PM
Marketwired Canada
Silver Grail Resources Ltd. (TSX VENTURE:SVG) (FRANKFURT:KD7) ("SVG") is pleased
to announce results from the heavy mineral sampling program conducted over the
Major Hart property, located 90km northeast of Dease Lake, BC.
Heavy mineral sample results are used to gain knowledge of mineral types,
phases, and grain sizes to improve follow-up targeting, and to increase the
contrast to background values where dilution by extensive till or other
environmental factors may mask potential anomalies that may not be obvious when
using other types of reconnaissance geochemistry methods. The results received
are considered to be exceptionally high in some elements notwithstanding the
concentration due to the method. The tin results are particularly high in
several samples, up to just under 20%, while total rare earth element oxides
including Y exceed 10% in certain samples.
Examination of the results obtained in the late 2010 Major Hart program indicate
a highly anomalous trend ("Main Anomaly Area") within the granite surrounding
the intruded contact with the ultramafics, which is fully contained in the north
of the claims area. The anomalous area is loosely defined as a two to three
kilometre wide belt containing large amounts of fluxing agents and unusual
elements such as boron, fluorine, lithium, tin, tungsten, bismuth, niobium,
yttrium and REEs. The density of samples has not yet fully constrained the area
to less than 20 km(2) at present. The contact with the ultramafic rocks appears
to have caused a strong reaction zone along the interface area with the
intruding granite, which geochemistry shows to be near saturation levels in some
elements, especially as the granitic melt cooled. The ultramafic rocks are of
such a contrasting composition to the evolved granite melt that "chemical
quenching" of the volatile and incompatible element-rich fluids may have caused
rapid deposition of large volumes of unusual mineral assemblages. Tungsten
skarns, tin greisens, pegmatites, and potential gemstone occurrences are
considered to be possible within the north ultramafic contact belt.
A second anomalous area ("South Anomaly Area") is contained within the Major
Hart claims, and is located south of the main anomaly. The general relationship
of anomalous samples to topography suggests that a phase of the granite is
REE-enriched in a mid-elevation belt around the southern extent of the northeast
lobe of the Major Hart Pluton, but does not carry the majority of the rare
metals that are ubiquitous in the ultramafic contact belt. The south trend
appears to primarily contain zirconium, REEs, and moderate or spotty high
beryllium values. One heavy mineral sample on the north end of this belt does
contain considerable amounts of tin, and the relationship with the north belt
here is uncertain. There may exist a continuum from one type of mineralization
to the other, where the south area melt possibly contained similar volatile
magmatic chemistry to the north, but was not destabilized by contact phenomena,
and therefore has cooled in a more systematic manner. Large interior pegmatites
could form in this environment, or sub-pegmatitic granitic phases with very
highly differentiated chemistry from the bulk of the pluton. The area containing
the southern anomaly is loosely constrained within approximately 12 km(2).
Potassium in the southern area is reduced compared to the north, while sodium,
calcium and phosphorus show moderate reciprocal increases, suggesting some sort
of modification of the bulk granite chemistry has occurred.
Selected results of the heavy mineral samples are as follows:
Fraction %
Sample Fraction of sample Fluorine Zirconium Niobium Tin LREE2O3
% F % ZrO2 % Nb2O5 % SnO2 % La - Eu %
Main Anomaly Area
HHM-000 -32I 0.37 NA NA 0.13 0.02 0.15
HHM-000 -32+60HN 0.01 2.59 2.49 1.83 1.17 2.22
HHM-000 - 60HN 0.04 0.46 15.48 2.45 1.28 5.31
----------------------------------------------------------------------------
HHM-001 -32I 0.51 NA NA 0.06 0.02 0.08
HHM-001 -32+60HN 0.02 3.47 1.24 2.08 5.75 1.48
HHM-001 - 60HN 0.05 1.24 14.82 3.14 7.81 4.35
----------------------------------------------------------------------------
HHM-003 -32I 0.48 NA NA 0.06 0.01 0.09
HHM-003 -32+60HN 0.02 1.02 2.92 3.37 8.91 4.94
HHM-003 - 60HN 0.03 0.58 12.82 2.92 3.46 8.40
----------------------------------------------------------------------------
HHM-004 -32I 3.94 NA NA 0.02 0.01 0.02
HHM-004 -32+60HN 0.08 1.08 2.02 2.38 4.56 2.65
HHM-004 - 60HN 0.14 0.53 7.77 0.84 1.66 3.89
----------------------------------------------------------------------------
HHM-009 -32I 0.23 NA NA 0.30 0.04 0.39
HHM-009 -32+60HN 0.01 1.45 6.19 3.65 19.80 11.05
HHM-009 - 60HN 0.04 0.71 18.48 2.37 3.68 10.70
South Anomaly Area
HHM-012 -32I 0.32 NA NA 0.08 0.01 0.10
HHM-012 -32+60HN 0.04 0.30 1.22 2.07 0.88 2.42
HHM-012 - 60HN 0.09 0.17 12.14 2.75 0.66 6.51
----------------------------------------------------------------------------
HHM-015 -32I 0.30 NA NA 0.07 0.01 0.16
HHM-015 -32+60HN 0.02 0.22 1.17 0.74 0.35 2.53
HHM-015 - 60HN 0.05 0.14 11.71 0.98 0.39 8.89
Sample Fraction HREE2O3 Yttrium Tantalum Tungsten Lithium
Gd - Lu % Y2O3 % Ta2O3 % WO3 % Li2O %
Main Anomaly Area
HHM-000 -32I 0.01 0.02 0.01 0.01 0.83
HHM-000 -32+60HN 0.24 0.38 0.16 0.19 NA
HHM-000 - 60HN 0.32 0.53 0.20 0.12 NA
HHM-001 -32I 0.01 0.02 0.01 0.00 0.53
HHM-001 -32+60HN 0.29 0.51 0.14 0.62 NA
HHM-001 - 60HN 0.42 0.79 0.22 0.43 NA
HHM-003 -32I 0.01 0.02 0.01 0.00 0.36
HHM-003 -32+60HN 0.67 1.13 0.18 0.32 NA
HHM-003 - 60HN 0.56 0.99 0.18 0.17 NA
HHM-004 -32I 0.00 0.01 0.00 0.00 0.09
HHM-004 -32+60HN 0.41 0.66 0.14 0.32 NA
HHM-004 - 60HN 0.23 0.40 0.10 0.13 NA
HHM-009 -32I 0.04 0.06 0.03 0.02 0.58
HHM-009 -32+60HN 0.65 1.08 0.23 0.20 NA
HHM-009 - 60HN 0.54 0.99 0.15 0.09 NA
South Anomaly Area
HHM-012 -32I 0.01 0.02 0.01 0.00 0.17
HHM-012 -32+60HN 0.45 0.73 0.10 0.14 NA
HHM-012 - 60HN 0.55 0.93 0.17 0.17 NA
HHM-015 -32I 0.01 0.02 0.01 0.00 0.12
HHM-015 -32+60HN 0.19 0.30 0.08 0.08 NA
HHM-015 - 60HN 0.38 0.61 0.12 0.09 NA
Note: The reader should be cautioned that these heavy mineral fraction results
are from a small portion of the original sample volume, are from reconnaissance
samples, and do not represent a resource of any type.
The limited whole rock data to date suggest that the general geochemical
characteristics of the Major Hart Pluton shares similarities to the Separation
Rapids Batholith in Ontario (host to the Big Whopper Pegmatite), parts of the
Surprise Lake Batholith in northwest British Columbia ( host to over 100 Minfile
showings), and the tin granites of Cornwall England, Thailand, southern China,
and parts of north Alaska. Major differences exist from most granites of
"similar" geochemistry, not the least of which is the very young age of 48 Ma,
and the apparent absence of muscovite mica. The granite has strong similarities
to topaz rhyolite compositions, mostly due to the very high silica content,
which is greater than 75% on average. Boron was not analysed in granite samples
but exceeds 1% B2O5 in five of the thirteen -32I heavy mineral fractions, to a
maximum of 3.41% B2O5.
Methodology: The 10 kg heavy mineral samples were processed by CF Mineral
Research, Kelowna, and separated into several discrete fractions by a
combination of specific gravity and grain size criteria. Several fractions
obtained from each heavy mineral sample were analysed by Actlabs, in Ancaster,
Ontario by various methods dependant on fraction size, expected mineralogy, and
desired element requirements. Methods utilized included sodium peroxide fusion
ICP/MS, lithium fusion ICP/MS, neutron activation, selective ion (for fluorine),
and XRF packages. A large number of the samples returned results in the percent
range for several elements of interest, especially the -60HN (minus 60 mesh,
heavy non-magnetic) and -32+60HN (minus 32 mesh to plus 60 mesh, heavy
non-magnetic) and the -32+60HP (minus 32 mesh to plus 60 mesh, heavy
paramagnetic) fractions. The intermediate specific gravity, -32mesh fraction
(-32+60I) was the only fraction analysed for boron and lithium, due to
analytical constraints and the range of minerals that were likely to occur in
this fraction. "Heavy" minerals, as used in the analyses, are those that exceed
a specific gravity of 3.32 g/cm(3). The intermediate (-32I) fraction contains
minerals with a specific gravity between a 2.92 and 3.32 g/cm(3).
Nb, Sn and Zr results above are reported in XRF values where available.
Elemental results not received from the laboratory as oxides have been converted
to oxide format using formulas obtained from the British Columbia Geological
Survey website, and the University of Maryland Geology Department website and
are believed to be accurate. Chondrite normalized REE patterns of all samples
collected from within the pluton exhibit a classic "seagull" pattern with a very
strong negative Eu anomaly and a relatively flat to slightly upturned HREE
pattern. LREE2O5 indicates combined LREEs in oxide format, and HREE2O5 indicates
combined HREEs in oxide format. Cerium is the largest component of the LREEs in
most cases, followed by lanthanum. Lutetium was not available in the -32I
fraction analyses.
D. Cremonese, P.Eng., is the Qualified Person for the purposes of this news release.
D. Cremonese, P.Eng., President,
Silver Grail Resources Ltd.
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future performance of our business, its operations and its financial performance
and condition, as well as management's objectives, strategies, beliefs and
intentions. Forward-looking statements are frequently identified by such words
as "may", "will", "plan", "expect", "anticipate", "estimate", "intend" and
similar words referring to future events and results. Forward-looking statements
are based on the current opinions and expectations of management. All
forward-looking information is inherently uncertain and subject to a variety of
assumptions, risks and uncertainties, including the speculative nature of
mineral exploration and development, fluctuating commodity prices, competitive
risks and the availability of financing, as described in more detail in our
recent securities filings available at www.sedar.com. Actual events or results
may differ materially from those projected in the forward looking-statements and
we caution against placing undue reliance thereon. Silver Grail Resources Ltd.
has an ongoing obligation to disclose material information, as it becomes
available.
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