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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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6588065940

6600066060

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

90

90

89

89

88

88

87

87

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85

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84

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76

76

75

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74

74

73

73

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

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-140

-120

-110

-100

-90

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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