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EM decay constant and electromagnetic anomalies, Magpie River–Missinaibi Lake area—Purchased data; Ontario Geological Survey, Map 60 328, scale 1:20 000.
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53000
3500035500
3600036500
37000 3750038000
3850039000
3950040000
4050041000
41500
24500250002550026000
2650027000
2750028000
2850029000
2950030000
3050031000
3150032000
3250033000
3350034000
1350014000
1450015000
1550016000
1650017000
1750018000
1850019000
1950020000
5750058000
58500
540005450055000
55500
5100051500
52000
4550046000
46500
40500410004150042000
3800038500
39000
6500065500
1
2
3
1
2
3
41
2
3
4
1
2
3 1
2 1
21 1
1
2
3
4
5
6
1
2
3
41
2
3
4
5
1
2
31
2
3
1
2
3 1
2
3
4
51
2
3
4 1
2
3
4 1
2
3
4
5 1
2
3
4 1
2
3 1
2
3 1
2
3
4 1
2
1
2
3
1
2
3
4
5
6
7
8 1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8 1
2
3
4
5
6
7 1
2
3
4
5
6
7
81
2
3
4
5
6 1
2
3
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5
6 1
2
3
4
5
1
23
4
5
1
2
3
4 1
2
3
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5 1
2
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5 1
2
3
4
5
6
1
2
3
41
2
3
41
2
3
4
5 1
2
3
4
5 1
2
3
4 1
2
3
4 1
2
3
4
1
2
3 1
2
3
1
2
3
11
1
2 1
2
1
2 1
21
2 1
2 1
2 1
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3
12
3 1
2
1
2 1
2
1 11 1 1 1
1
2 1
2 1
2
1
21
2
1
2
3
1
2
3
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4
1
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2 1
2
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1
2
1
2
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1
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1
2
1 1
1
2
1
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3
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2 1
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21
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2
1
1
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1
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1 1 1
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2
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3
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3
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31
2
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3
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51
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81
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61
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12
WEST TP.
STOVER TP.
BobtailLake
Eskay Lake
ProspectLake
Dog River
McKewen Lake
AllenLake
LanceleyLake
Stover Lake
Annex Lake
CampbellLake
McKeeLake
Baltimore Lake
BossLake
Loch Katrine
ChinLake
Pinny Lake
Colborne Lake
Harcourt Lake
Martin Lake
Stephenson Lake
Rennie LakeRen Lake
Meath Lake
AlisterLake
Knee Lake
Easey LakeHallLake
Quary Lake
Spring Lake
CarterLake
Garvey Lake
RENNIE TP.
TuckerLakeButle
r
MEATH TP.
Moorhouse Lake
Corm
ick
ShehanLake
MacamicLake
Battley Lake
TremLake
Conboy Lake
Saturday Lake
Cormick Lake
ButlerLake
SOUTH GREENHILLLAKE SAND DELTA
CONSERVATION RESERVE
Lochalsh Bay
(Dog Lake)
Sixty OneBay
(Dog Lake)
PuppyLake
FiftyNineLake
JuneLake
GLASGOW TP.
LEESON
TP.
RIGGS TP.
BR
AC
KIN
TP.
Creek
Cree
k
McKewen Lake
Rennie C
reek
Rennie
Creek
19'
20'
20'
21'
21'
22'
22'
23'
23'
24'
24'
25'
25'
26'
26'
09'
09'
08'
08'
07'
07'
06'
06'
05'
05'
04'
04'
03'
03'
02'
02'
01'
01'
84°00'00"
84°00'00"
59'
59'
58'
58'
57'
57'
56'
56'
55'
55'
54'
54' 53'
84°10'07"
48°26'57"
84°09'41"
48°26'30"
83°52'35"
83°53'03"
48°18'44"48°19'11"
100
200
300
500
600
800
900
1000
1200
1300
1500
1600
1700
1900
2000
2200
2300
2400
2600
2700
2900
3000
3100
3300
3400
3600
3700
3900
LEGEND
EM DECAY CONSTANT (TAU) GRID
DECAY CONSTANT (TAU)
20 μsec
100 μsec Decayconstant low
2500 μsec
ELECTROMAGNETIC ANOMALY SYMBOLS
microseconds (μsec)
Decay Constant ClassificationAnomaly
> 4000 microseconds
3000 - 4000 microseconds
2000 - 3000 microseconds
1000 - 2000 microseconds
500 - 1000 microseconds
0 - 500 microseconds
cultural response
microseconds(μsec)
© Queen's Printer for Ontario, 2011.
This map is published with the permission of the Director,Ontario Geological Survey.
NTS References: 42 B/5, C/8.
500 m 0 0.5 1 km
Scale 1:20 000
AIRBORNE MAGNETIC ANDELECTROMAGNETIC SURVEYS
Colour-filled contours of the EM decayconstant and electromagnetic anomalies
MAP 60 328
Ontario Geological Survey
Purchased Data
SOURCES OF INFORMATION
Data acquisition, data compilation for blocks 1, 2 and 4 byGeotech Ltd., Aurora, Ontario, for Chalice Diamond Corp.,Vancouver, British Columbia.
Data acquisition, data compilation for block 3 by GeotechLtd., Aurora, Ontario, for Golden Chalice Resources Inc.,Vancouver, British Columbia.
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, colour-filled contours of the EMdecay constant and electromagnetic anomalies, Magpie River–Missinaibi Lake area―Purchased data; Ontario GeologicalSurvey, Map 60 328, scale 1:20 000.
CREDITS
Introduction
This map was compiled from multiple proprietary airbornesurveys purchased by the Ontario Ministry of NorthernDevelopment, Mines and Forestry. These surveys were flownusing the Geotech VTEM helicopter-borne magnetic andelectromagnetic system. The aircraft were also equipped withGPS navigation systems and digital data acquisition systems.
EM Decay Constant
EM decay constant values were calculated for each time channelof the Z-coil response, based on the response amplitude at theparticular channel and the amplitude of a later channel, eitherimmediately successive or further down the decay curve, toensure the signal levels and signal difference are suitably abovesignal noise threshold. The longest time constant value in thearray was favoured. For each sample, only those channels withsufficient amplitude above the noise level were used in thecalculation. In semi-log space, the slope of this function willreflect the decay rate of the transient and therefore the strengthof the conductivity. A slow rate of decay, reflecting a highconductivity, will be represented by a high decay constant value.
The computed decay constant values were filtered using a 21point Hanning filter and interpolated onto a 20 m regular grid,using the bi-cubic spline algorithm.
EM Anomalies
The VTEM system will respond to conductive overburden,near-surface horizontal conducting layers, man-made sourcesand bedrock conductors. Identification of natural conductors isbased on the rate of transient decay, magnetic correlation andresponse shape, together with the response pattern andtopography. Man-made responses may be identified byexamining the powerline monitor.
Anomalies were classified as having an inductively thin source,which produces a double-peaked (M-shaped) response withthe trough centered over the conductor, or as an inductivelythick source, which produces a single-peaked responsecentered over the conductor.
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.
FLIGHT LINE INFORMATION
Anomaly number
1
Line direction
Line number
>127
0112
3
Fiducial
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 8°26'W in 2011.
Kumar, H. 2006. Report on a helicopter-borne VTEM geophysicalsurvey, Chapleau project; unpublished report for Golden ChaliceResources Ltd.
Kumar, H. 2007. Report on a helicopter-borne VTEM geophysicalsurvey, Rennie Block; unpublished report for Chalice DiamondCorp.
Orta, M. 2008. Report on a helicopter-borne VTEM geophysicalsurvey, Aguonie-Cowie-Corbiere-Esquega townships;unpublished report for Chalice Diamond Corp.
Orta, M. 2008. Report on a helicopter-borne VTEM geophysicalsurvey, Chapleau Main Block Chapleau diamond project;unpublished report for Chalice Diamond Corp.
Location Map 1 cm equals 10 km
SURVEY PARAMETERSAIRCRAFT
Type: Aerospatiale AS350BA (Block 1)Registration: C-QWOWType: Aerospatiale AS350B-2 (Blocks 2,4)Registration: C-FXFUType: Aerospatiale AS350B-3 (Block 3)Registration: C-GEOZ
MAGNETOMETERType: caesium-vapourSensitivity: 0.02 nTSample interval: 10 readings per secondSensor location: 42 m below aircraft (Block 1)
15 m below aircraft (Blocks 2,4)13 m below aircraft (Block 3)
ELECTROMAGNETIC SYSTEMType: VTEMBase frequency: 30 HzCurrent waveform: trapezoidPeak dipole moment: 450 000 Am² (Block 1)
422 620 Am² (Block 2)418 160 Am² (Block 3)486 300 Am² (Block 4)
Pulse width: 7300 µsec (Blocks 1,2,4)7600 µsec (Block 3)
Off-time: 16 591 µsec (Blocks 1,2,4)18 333 µsec (Block 3)
Parameters: Z-component of dB/dtSample interval: 10 readings per secondBird location: 42 m below aircraft (Block 1)
40 m below aircraft (Blocks 2,4)35 m below aircraft (Block 3)
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: February 4, 2007 to February 17, 2007 (Block 1)
January 24, 2008 to February 12, 2008 (Block 2)March 29, 2006 to April 28, 2006 (Block 3)October 6, 2007 to January 21, 2008 (Block 4)
Nominal aircraft terrain clearance: 90 m (Block 1)75 m (Blocks 2,3,4)
Traverse line spacing: 75 mControl line spacing: 750 mTraverse line direction: North-South (Blocks 1,2,3)
N4°E (Block 4)Control line direction: East-West (Blocks 1,2,3)
E4°S (Block 4)
COORDINATE SYSTEMProjection: Universal Transverse MercatorDatum: NAD83Central meridian: 87°00'W (UTM zone 16N)Central scale factor: 0.9996False easting: 500 000 mFalse northing: 0 m
Data purchased from: Chalice Diamond Corp. (Blocks 1,2,4)Golden Chalice Resources Inc. (Block 3)
500 μsec
