Darnley Bay Discovers Two New Magneto-Telluric Anomalies
TORONTO, ONTARIO--(Marketwired - Dec 4, 2013) - Darnley Bay
Resources Ltd (TSX-VENTURE:DBL)
Darnley Bay Resources Limited ("Darnley Bay" or the "Company")
is pleased to announce the discovery of two new large
magneto-telluric (MT) anomalies at its 100% owned Darnley Bay
Property, located near Paulatuk, Northwest Territories. Like the
first MT anomaly - reported (see October 13, 2013 press release),
the new anomalies are spatially coincident with
previously-discovered gravity anomalies, are considered good to
moderate conductive zones and appear to be hosted by prospective
Proterozoic rocks. They are located respectively two and twelve
kilometres east of the first MT anomaly.
Darnley Bay received the latest 3D inversion results from
EMpulse Geophysics Ltd, the geophysical contractor. The new
inversions not only used the magnetic field tipper data, but also
included static shift analysis to minimise near surface geologic
noise and to better image the apparent resistivity distribution at
depth (see EMpulse web site for more details
http://www.empulse.ca/).
The MT survey was performed in August 2013 and consisted of a
total of 73 line-kilometres, with stations every 500 metres, over
three different lines (North, South and East). See
http://www.darnleybay.com/news/Figure_1 and
http://www.darnleybay.com/news/Figure_2, 1:250,000-scale plan
views, showing the location of the surveyed lines and of the MT
anomalies over gravity and magnetic models backgrounds.
http://www.darnleybay.com/news/Figure_3 is a stack of three
vertical profiles along the North Line; the two upper profiles show
the MT anomalies over a gravity and a magnetic models background;
the lower profile show the MT anomalies over a 2D geological model
that honours the gravity, the magnetic and the seismic data of this
sector. The new 3D-inversion model revealed:
- On the North Line, 12 kilometers east of the first anomaly, a
1.5x3.5 kilometres anomaly with a maximum thickness of 800 metres,
its center being at elevation -2,000 metres (below sea level), It
is considered to be a moderate to good conductive zone with
apparent resistivity values ranging from 32 to 8.9 Ohm-m
- On the North Line, two kilometres east of the first anomaly, a
1.0 x 2.0 kilometres anomaly with maximum thickness of 600 metres,
centered at elevation -1,300 metres with apparent resistivity
between 32 Ohm-m and 15.1 Ohm-m
- On the South and East Lines, three weaker anomalies (80 to 45
Ohm-m), with dimensions of 1.0x1.0-3.0 kilometres between
elevations -1,000 to -2,400 metres.
The extent, depth, conductivity and the geological setting of
the three MT anomalies on the North line fit the metallogenic
exploration models Darnley Bay is exploring for: either a
copper-nickel magmatic model (example: Sudbury in Ontario or
Noril'sk in Russia) or an Iron Oxide Copper Gold model (example:
Olympic Dam in Australia).
"I am pleased by these latest results," says Jamie Levy,
President of Darnley Bay. "We now see two new conductive
magneto-telluric (MT) anomalies, along with our previously
announced anomaly, on the North line. In addition, three less
conductive MT anomalies have been interpreted on the East and South
lines. We believe the north line has identified priority drill
targets with favourable geological and geophysical settings."
The Darnley Bay Property covers a total of 456,000 hectares with
a series of mineral concessions and prospecting permits obtained
from the Inuvialuit Regional Corporation and the Canadian
Government. The Property encompasses what is considered one of the
largest and strongest coincident regional gravity and magnetic
anomalies in the world with dimensions of 80 x 100 kilometers. The
regional gravity anomaly has absolute amplitude of 132 mGal
(milli-gals), while the magnetism reaches 1,350 nT (nano-teslas).
Darnley Bay staff believes the source of this anomaly is a large
and deep mafic-ultramafic intrusion, the type underlying other base
metal mining camps, with the potential for mineralization being at
shallower depth than the main intrusion itself. It is thought that
it was formed during the regional Franklin or the Mackenzie
magmatic events, both Proterozoic in age (720 million years and
1,270 million years respectively).
Magneto-tellurics is a geophysical method of imaging the Earth's
subsurface by measuring natural variations of electrical and
magnetic fields at the Earth's surface. In the 1990's, MT was
successfully used to locate mineral deposits as deep at 1,750
metres in the Sudbury nickel mining camp. In the last 10 years, the
technique has seen many improvements, particularly with the
development of modern 3D inversion. In the oil industry, it is now
routinely used, in conjunction with seismic, to better define deep
drilling targets.
At the Voisey's Bay nickel mine, magneto-telluric survey data
detected the nickel-copper mineralization at depth, with apparent
resistivities between 10 and 25 Ohm-m
(http://www.cemi.utah.edu/appls/mt/) similar to the range of values
of the three MT anomalies detected on the North line last August on
Darnley Bay Property. Resistivity from the Darnley Bay MT anomalous
zones may decrease once the final processing of additional low
frequency data is completed. Readers are cautioned that the
similarity of the survey results is not necessarily indicative of
mineralization on the Property. The magneto-telluric method only
measures variations in resistivity in the earth and MT anomalies
can also be caused by variations in resistivity due to large scale
variations in lithology, structure, and/or conductivity of
disseminated minerals or pore fluids as in sedimentary rocks.
However, the fact that all the anomalies detected so far are
closely related to gravity anomalies
(http://www.darnleybay.com/news/Figure -1-
http://www.darnleybay.com/news/Figure -2 ) suggests that the MT
anomalies could be produced by denser material than the surrounding
rocks; metal-rich lithologies and/or alteration zones being
possible sources.
Darnley Bay is waiting for more results from EMpulse;
particularly the processing and inversion of the extended bandwidth
time series (to 1Hz) that should provide information to depth of 3
to 5 kilometres. Darnley Bay is planning to do more detailed MT
surveying on each side of the North line, in order to better define
the attitude and orientation of the anomalies for an eventual
drilling program. Darnley Bay is also planning more MT surveying
over other selected areas on the Property.
The 2013 MT survey on the Darnley Bay Property was performed
by EMpulse Geophysics Ltd, from Dalmeny, Saskatchewan
(http://www.empulse.ca/). The technique used for this
survey is Transient Audio-Magneto-Telluric, with proprietary SFERIC
II instrumentation and Adaptive Polarization Stacking
algorithm. David Goldak, M.Sc. (Physics), President of
EMpulse Geophysics, was in charge of the survey in the field and
responsible for the 3D-inversion and the data processing. The
technical information of this Press Release has been prepared,
reviewed and approved by Mr. J. Gauthier, P. Eng., P. Geo., the
Qualified Person as defined by National Instrument 43-101.
The Company is very pleased to announce the hiring of Alan King
as a senior technical adviser. Mr. King is a geophysicist who most
recently served as the Chief Geophysicist for Vale's global
exploration operations. Alan holds a B.Sc. in geology from the
University of Toronto and a M.Sc. in geophysics from Macquarie
University. Mr. King has worked as a geophysicist in exploration
and resource development globally, including in Canada, Australia,
and Brazil, since 1976. Mr. King has been involved in the
application of geophysics in mining, oil sands development and
environmental applications for a variety of commodities. Mr. King
currently acts as a geophysical consultant through Geoscience
North.
Forward-Looking Information
This release includes certain statements that may be deemed
"forward-looking statements". All statements in this release, other
than statements of historical facts, that address future
production, reserve potential, exploration drilling, exploitation
activities and events or developments that Darnley Bay expects are
forward-looking statements. Although Darnley Bay believes the
expectations expressed in such statements are based on reasonable
assumptions, such statements are not guarantees of future
performance and actual results or developments may differ
materially from those in the statements. There are certain factors
that could cause actual results to differ materially from those in
forward-looking statements. These include market prices,
exploitation and exploration successes, continued availability of
capital and financing, and general economic, market or business
conditions. Investors are cautioned that any such statements are
not guarantees of future performance and actual results or
developments may differ materially from those projected in the
forward-looking statements. For more information on Darnley Bay,
investors should review registered filings at
www.sedar.com.
Neither the TSX Venture Exchange nor its Regulation Services
Provider (as that term is defined in the policies of the TSX
Venture Exchange) accepts responsibility for the adequacy or
accuracy of this release.
Darnley Bay Resources LimitedJamie LevyPresident and CEO(416)
862-7885(416) 862-7889jlevy@darnleybay.comDarnley Bay Resources
LimitedGreg O'HalloranInvestor Relations(647)
385-2113gohalloran@darnleybay.comwww.darnleybay.com
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