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Ontario Geological Survey 2015. Airborne magnetic and gamma-ray spectrometric surveys, colour-filled contours of the residual magnetic field, Lac des Milles Lacs–Nagagami Lake area; Ontario Geological Survey, Map 82 675, scale 1:50 000.
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6612066180
6 636066420
6 648066540
666006 6 66 0
667206 6780
6 6840
6 696067020
6 708067140
6720067260
6732067380
6 7 56 067 62 0
6768067740
6780067860
6792067980
681606 8220
682806 8340
6840068460
6852068580
68 76 06 8820
6888068940
6900069060
69 12069180
6 93606 9420
694806 9540
6960069660
6972069780
6996070020
7008070140
702007 0260
7 0 32 070380
7056070620
7068070740
708007 0860
7092070980
7116071220
7 128071340
7140071460
7152071580
7 170071760
7182071880
7194072000
7206072120
72180
7230072 360
7 2 42 072480
72 54072600
7266072720
72780
7290072960
7302073080
7314073200
7326073320
7350073560
7362073680
7374073800
7386073 92 0
73980
6 216062220
6228062340
6240062460
6252062580
6 276062820
6288062940
6300063060
631206 3 18 0
6336063 420
6348063540
6360063660
6372063780
63840
6396064020
64 08 064140
6 420064260
6432064380
64440
6456064620
6468064740
6480064860
6 49206 4980
65040
651606 5220
652806 5340
6540065460
6552065580
65640
6576065820
6588065940
6600066060
6612066180
663606 6420
66 48066540
6660066660
6 672066780
6696067020
6708067140
6720067260
6732067380
6756067620
676806 7740
6780067860
6792067 980
5148051540
5160051660
5172051780
5184051900
5202052080
5214052200
5226052320
5238052440
52500 526205 2680
5274052800
5286052920
5298053040
5322053280
533405 3400
5346053520
5358053640
5382053880
5394054000
5406054120
541805 4240
5436054420
5 448054540
5460054660
5472054780
54840 549605 5 02 0
5508055140
55 20055260
5532055380
900960102010801140120012601320
49380 49440 49500 49560 49620 49680 49740 49800
69000690606912069180692406930069360
54960 55020 55080 55140 55200 55260 55320
6858068640687006876068820688806894069000
50400 50460 50520 50580 50640 50700 50760
51120 51180 51240 51300 51360 51420 51480 51540
6942069480695406960069660697206978069840
756607572075780758407590075960
57540 57600 57660 57720 57780
68460 68520 68580 68640 68700 68760
58980 59040 59100 59160 59220
702007026070320703807044070500
705007056070620706807074070800
50700 50760 50820 50880 50940 51000
74760748207488074940750007506075120
56280 56340 56400 56460 56520 56580 56640
45180 45240 45300 45360 45420 45480
64860649206498065040651006516065220
46860 46920 46980 47040 47100 47160 47220
5766
0
5772
0
5778
0
5784
0
5790
0
57240
57300
5383000 m 5383000 m
84 84
85 85
86 86
87 87
88 88
89 89
90 90
91 91
92 92
93 93
94 94
95 95
96 96
97 97
98 98
99 99
5400000 m 5400000 m
01 01
02 02
03 03
04 04
05 05
06 06
07 07
08 08
09 09
10 10
11 11
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
5421000 m 5421000 m
399000 m
399000 m
98
98
97
97
96
96
95
95
94
94
93
93
92
92
91
91
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90
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88
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73
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72
72
71
71
70
70
369000 m
369000 m88°48'08" 45' 40' 35' 30' 25' 88°21'57"
48°56'34"
55'
50'
45'
40'
48°35'00"
88°21'22"25'30'35'40'45'88°47'22"
48°34'38"
35'
40'
45'
50'
55'
48°56'12"
-320
-280
-260
-240
-220
-210
-200
-180
-170
-160
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-120
-110
-100
-90
-80
-60
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-30
-10
10
30
60
110
160
250
440
RESIDUAL MAGNETIC FIELD GRIDnanoteslas
(nT)
2 km01 km 1
NTS References: 52 A/9, 10, 15, 16
© Queen's Printer for Ontario, 2015.
This map is published with the permission of the Director,Ontario Geological Survey.
Location map 1 cm equals 35 km
U.S.A.
ThunderBay
Geraldton
Marathon
LakeNipigon
Lake Superior
11
17
11
17
85°86°87°88°89°90°91°
49°
50°
48°
51°
82669 8267182670 82672 82673
826748267582678 82681
82677 82680 82683
82676 82679 82682 82684
82685
82686
82687
82688
82689
82690
82691
SURVEY PARAMETERS
DESCRIPTIVE NOTES
Introduction
The data comprising this map are derived from the results of anairborne magnetic and gamma-ray spectrometric survey carriedout by Goldak Airborne Surveys. The survey was flown using 2Piper PA-31 Navajo aircraft. The aircraft were each equippedwith 3 Geometrics magnetic sensors, Radiation Solutionsgamma-ray spectrometers, GPS navigation systems and digitaldata acquisition systems.
Residual Magnetic Field Map
The contours of residual magnetic intensity were generated fromdigitally recorded data. The magnetic data were levelled to thecontrol lines and interpolated onto a 40 m regular grid using localhorizontal gradients to guide between-line splines. A regionalcorrection was applied to level the magnetic field to the OntarioMaster Aeromagnetic Grid.
Magnetic declination on September 7, 2014, for the centre of thesurvey area was 5.2°W, magnetic inclination was 74.6° and themagnetic field strength was 56 929.6 nT (calculated using IGRF).
Scale 1:50 000
MAGNETIC CONTOURSnanoteslas (nT)
10 nT contour
50 nT contour
200 nT contour
Magnetic
1000 nT contour
depression
CREDITS
Data acquisition, data compilation and map production byGoldak Airborne Surveys, Saskatoon, Saskatchewan.
Project management and quality assurance by Paterson,Grant and Watson Limited, Toronto, Ontario.
Contract management, base maps and map surrounds by theMinistry of Northern Development and Mines, Sudbury, Ontario.
Every possible effort has been made to ensure the accuracy ofthe information presented on this map; however, the Ministry ofNorthern Development and Mines does not assume liability forerrors that may occur. Users should verify critical information.
Corresponding digital data for this survey are available fromthe following Ontario Geological Survey publication:
Ontario Geological Survey 2015. Ontario airborne geophysicalsurveys, magnetic and gamma-ray spectrometric data, grid andprofile data (ASCII format) and vector data, Lac des Mille Lacs–Nagagami Lake area; Ontario Geological Survey, GeophysicalData Set 1078a.
Ontario Geological Survey 2015. Ontario airborne geophysicalsurveys, magnetic and gamma-ray spectrometric data, grid andprofile data (Geosoft® format) and vector data, Lac des MilleLacs–Nagagami Lake area; Ontario Geological Survey,Geophysical Data Set 1078b.
Issued 2015.
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 2015. Airborne magnetic and gamma-ray spectrometric surveys, colour-filled contours of the residualmagnetic field, Lac des Mille Lacs–Nagagami Lake area;Ontario Geological Survey, Map 82 675, scale 1:50 000.
SOURCES OF INFORMATION
Base map information derived from the Land Information OntarioData Warehouse, Land Information Ontario, Ministry of NaturalResources and Forestry, scale 1:50 000.
Magnetic declination for the centre of the map area wasapproximately 4°26'W in 2015.
Users of OGS products are encouraged to contact thoseAboriginal communites whose traditional territories may belocated in the mineral exploration area to discuss their project.
LEGEND
AIRCRAFTType: Piper Navajo PA-31Registration: C-GJBB, C-GJBG
MAGNETOMETERType: Geometrics cesium-vapourSensitivity: 0.005 nTNoise level: 0.05 nTSample interval: 10 readings per secondSensor locations: wingtips (transverse separation is 14.78 m)
tail stinger (longitudinal separation is 9.75 m)Compensation: RMS AADCIIData Acquisition: GEDAS
GAMMA-RAY SPECTROMETER SYSTEMType: Radiation Solutions RS-500Downward-looking crystal volume: 33.6 LUpward-looking crystal volume: 8.4 LNumber of channels: 1024Sample interval: 1 reading per secondSensor location: near centre of aircraftPotassium window: 1370 to 1570 keVUranium window: 1660 to 1860 keVThorium window: 2410 to 2810 keVTotal count window: 410 to 2810 keV
NAVIGATION SYSTEMGPS receiver: Novatel OEM4 ProPakGPS sample interval: 1 reading per secondRadar altimeter: Thompson CFS 530ARadar sample interval: 10 readings per secondBarometric altimeter: Setra 270Barometric sample interval: 10 readings per secondVideo flight path camera: Panasonic GPKR402 HRSVNavigation-Acquisition: GEDAS
BASE STATIONType: GEM System GSM-19WMagnetometer sample interval: 1 reading per secondGPS sample interval: 1 reading per second
SURVEY SPECIFICATIONSSurvey date: July 18 to October 29, 2014Nominal aircraft terrain clearance: 100 mTraverse line spacing: 200 mControl line spacing: 2000 mTraverse line direction: 0 degreesControl line direction: 90 degrees
CO-ORDINATE SYSTEMProjection: Universal Transverse MercatorDatum: NAD83Central meridian: 87°W (UTM zone 16N)Central scale factor: 0.9996False easting: 500 mFalse northing: 0 m
FLIGHT LINE INFORMATION
Line directionLine number
>L12
701
1230 Fiducial
Ontario Geological Survey
MAP 82 675
AIRBORNE MAGNETIC ANDGAMMA-RAY SPECTROMETRIC
SURVEYS
Colour-filled contours of theresidual magnetic field
LAC DES MILLE LACS–NAGAGAMI LAKE AREA
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