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form: Ontario Geological Survey 2011. Airborne magnetic and
electromagnetic surveys, shaded colour image of the
second vertical derivative of the residual magnetic field and
Keating coefficients, Elliot Lake–River aux Sables area—Purchased
data; Ontario Geological Survey, Map 60 170, scale 1:20 000.
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37 37
38 38
39 39
40 40
5141000 m 5141000 m
381000 m
381000 m
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398000 m
398000 m
5136000 m 5136000 m
Rioux Lake
Pecors LakeStinson Lake
Pardee Lake
VanhornLake
TeesLake
FlyingGooseLake
GA
IASH
K TP.
DiabasePoint
JOU
BIN
TP.
RumPoint
Hough Lake
ShelterPoint
ElephantLake
Whitefish Lake
Deresti Lake
Whiskey Lake
GLENN N. CROMBIECONSERVATION
RESERVE
GLENN N. CROMBIE CONSERVATION RESERVE
Serpent
Riv
er
23'
24'
33' 32' 31'
30' 29'
28' 27'
26'
25' 24' 23' 22' 21' 20'30' 29' 26'
24'
33' 32' 31' 28'
23'
27' 25' 24' 23' 22' 21' 20'
46°24'51"
82°33'22"46°25'02"
82°19'20"
46°22'01"
82°19'16"82°33'17"
46°21'51"
22'
-0.0284
-0.0158
-0.0108
-0.0078
-0.0060
-0.0046
-0.0036
-0.0028
-0.0022
-0.0018
-0.0014
-0.0010
-0.0008
-0.0004
-0.0002
0.0000
0.0002
0.0004
0.0008
0.0012
0.0016
0.0022
0.0032
0.0048
0.0072
0.0122
0.0276
SHADED IMAGE SUN ANGLE
IlluminationInclination = 45°
IlluminationDeclination = 45°
Shaded image is produced by applying an artificial sun
illuminationto the second vertical derivative of the magnetic field
grid.
N
EW
S
Plan view
45°
Side view
Base map information derived from the Ontario Land
InformationWarehouse, Land Information Ontario, Ontario Ministry of
NaturalResources, scale 1:50 000.
Magnetic declination for the centre of the map area
wasapproximately 9°49'W in 2011.
Keating, P.B. 1995. A simple technique to identify
magneticanomalies due to kimberlite pipes; Exploration and
MiningGeology, v.4, no.2, p.121-125.
Kumar, H. 2008. Report on a helicopter-borne VTEM
geophysicalsurvey, Elliot Lake project; unpublished report for
First UraniumInc.
Kumar, H. 2008. Report on a helicopter-borne VTEM
geophysicalsurvey, Gaiashk property; unpublished report for
VerbinaResources Inc.
Kumar, H. 2008. Report on a helicopter-borne VTEM
geophysicalsurvey, Serpent River property; unpublished report
forInternational Montoro Resources Inc.
© Queen's Printer for Ontario, 2011.
This map is published with the permission of the
Director,Ontario Geological Survey.
NTS References: 41 J/7,8.
500 m 0 0.5 1 km
Scale 1:20 000
SOURCES OF INFORMATION
Data acquisition, data compilation by Geotech Ltd.,
Aurora,Ontario.
Data reprocessing and map production by Scott Hogg
&Associates, Toronto, Ontario.
Contract management, base maps and map surrounds by theOntario
Ministry of Northern Development, Mines and Forestry,Sudbury,
Ontario.
To enable the rapid dissemination of information, this map
hasnot received a technical edit. Every possible effort has
beenmade to ensure the accuracy of the information
presented;however, the Ontario Ministry of Northern Development,
Minesand Forestry does not assume liability for any errors that
mayoccur. Users can verify critical information from the
correspondingdigital profile, gridded and EM anomaly data
distributed by theOntario Geological Survey.
The geophysical data on this map were purchased from theprivate
sector. The original data acquisition was neithersupervised by the
Ontario Geological Survey (OGS) nor carriedout to OGS technical
specifications. However, the purchaseddata do meet a pre-defined
valuation criteria set out by the OGS.Some quality assurance and
quality control checks have beencarried out on the digital
data.
Issued 2011.
Information from this publication may be quoted if credit is
given.It is recommended that reference be made in the following
form:
Ontario Geological Survey 2011. Airborne magnetic
andelectromagnetic surveys, shaded colour image of the
secondvertical derivative of the residual magnetic field and
Keatingcoefficients, Elliot Lake–River aux Sables
area―Purchaseddata; Ontario Geological Survey, Map 60 170, scale
1:20 000.
CREDITS
AIRBORNE MAGNETIC ANDELECTROMAGNETIC SURVEYS
Shaded colour image of the second verticalderivative of the
residual magnetic field
and Keating coefficients
MAP 60 170
Ontario Geological Survey
Purchased Data
Introduction
This survey was flown using the Geotech VTEM helicopter-borne
magnetic and electromagnetic system. The aircraft wasalso equipped
with a GPS navigation system and a digitaldata acquisition
system.
Second Vertical Derivative of the Magnetic Field
The second vertical derivative values of the magnetic field
werecomputed directly from the gridded residual magnetic
intensitydata using a fast Fourier transform, combining the
transferfunctions of the second vertical derivative and a
half-cosine low-pass filter (100 m cut-off wavelength). The
low-pass filter wasapplied in order to attenuate unwanted high
frequenciesenhanced by the derivative operator.
The shaded relief parameters are:Illumination inclination:
45°Illumination declination: 45°
Magnetic declination on January 10, 2008, for the centre of
thesurvey area was 8.9°W. Magnetic inclination on January 10,2008,
for the centre of the survey area was 72.9°N. Magneticfield
strength was 58 563 nT (calculated using the
InternationalGeomagnetic Reference Field).
DESCRIPTIVE NOTES
Users of OGS products are encouraged to contact thoseAboriginal
communities whose traditional territories may belocated in the
mineral exploration area to discuss their project.
Positive correlation
LEGEND
75%
80%
85%
90%
Negative correlation
KEATING COEFFICIENTS
SECOND VERTICAL DERIVATIVEOF THE MAGNETIC FIELD GRID
nanoteslas per metre²(nT/m²)
Location Map 1 cm equals 10 km
AIRCRAFTType: Aerospatiale AS350B-2Registration: C-FXFU
MAGNETOMETERType: caesium-vapourSensitivity: 0.02 nTSample
interval: 10 readings per secondSensor location: 15 m below
aircraft
ELECTROMAGNETIC SYSTEMType: VTEMBase frequency: 30 HzCurrent
waveform: trapezoidPeak dipole moment: 413 900 Am²Pulse width: 7250
µsecOff-time: 16 628 µsecParameters: Z-component of dB/dtSample
interval: 10 readings per secondBird location: 35 m below
aircraftFalse northing: 0 m
SURVEY PARAMETERS
Keating Correlation Coefficients
Possible kimberlite targets have been identified from the
residualmagnetic intensity data, based on the identification of
roughlycircular anomalies. This procedure was automated by using
aknown pattern-recognition technique (Keating 1995), whichconsists
of computing, over a moving window, a first-orderregression between
a vertical cylinder model anomaly and thegridded magnetic data.
Only the results where the absolutevalue of the correlation
coefficient is above a threshold of 75%were retained. The results
are depicted as circular symbols,scaled to reflect the correlation
value. The most favourabletargets are those that exhibit a cluster
of high-amplitudesolutions. Correlation coefficients with a
negative valuecorrespond to reversely magnetized sources. It is
important tobe aware that other magnetic sources may correlate well
withthe vertical cylinder model, whereas some kimberlite pipes
ofirregular geometry may not.
The cylinder model parameters are as follows:Cylinder diameter:
200 mCylinder length: infiniteOverburden thickness: 5 mMagnetic
declination: 9°WWindow size: 10 x 10 cells (400 m x 400 m)
NAVIGATION SYSTEMGPS receiver: Novatel OEM4-G2-3151WGPS sample
interval: 5 readings per secondRadar altimeter: Terra
3000/TRI-40Radar sample interval: 5 readings per secondGuidance
system: GeotechDigital acquisition system: Geotech
BASE STATIONMagnetometer: Geometrics caesium-vapourMagnetometer
sample interval: 1 reading per secondGPS sample interval: 1 reading
per second
SURVEY SPECIFICATIONSSurvey date: January 3, 2008 to January 16,
2008Nominal aircraft terrain clearance: 85 mTraverse line spacing:
100 mControl line spacing: 1000 mTraverse line direction:
North-SouthControl line direction: East-West
COORDINATE SYSTEMProjection: Universal Transverse MercatorDatum:
NAD83Central meridian: 81°00'W (UTM zone 17N)Central scale factor:
0.9996False easting: 500 000 mFalse northing: 0 m