FIRST VERTICAL DERIVATIVE
Eötvös
LEGEND
Introduction
Ontario Geological Survey.This map is published with the permission of the Director,
© Queen's Printer for Ontario, 2004.
Issued 2004.
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 2004. Airborne gravity survey,
Bouguer gravity, northeast Timmins area: Highway 101 corridor; Ontario Geological Survey,
sin² )/sqrt (1 - 0.00669437999013 × sin² ), where is the
the latitude , and h is the altitude of the plane above the
gravity data to calculate the Bouguer anomaly data: The following standard corrections were applied to the
The calculated gravity is corrected for the Eötvös effect and the aircraft in flight by extremely accurate GPS measurement.environment. This is achieved by modelling the movements of processing must extract gravity data from this very dynamicaircraft can reach 0.1 g, equivalent to 100 000 mGal. Data inertial accelerations. In survey flying, accelerations in anby subtracting the GPS derived aircraft accelerations from the designed filters to avoid biasing the data. Gravity is calculated and decimated to match GPS measurements using specially Gravity data are recorded at 128 Hz. Accelerations are filteredGravity Data
DESCRIPTIVE NOTES
6 km420Scale 1:100 000
(Some symbols may not apply to this map)
OTHER SYMBOLS
Administrative
Power line
Main road
Secondary road
Trail
Drainage
Railroad
boundary
data acquisition system.radar altimeter, laser altimeter and a Sander NavDAS digital The aircraft were also equipped with a GPS navigation system,Geophysics' AIRGrav airborne gravity system. The survey was flown using 2 aircraft equipped with Sander
Radar sample rate: 4 Hz
midpoint 2.7 km full wave length
Grid cell size: 200 m
False northing: 0 mFalse easting: 500 000 mCentral scale factor: 0.9996Central meridian: 81°00'W (UTM zone 17N)Datum: NAD83Projection: Universal Transverse Mercator
Bouguer and terrain correction density: 2.67 g/cm³
Laser altimeter: Optech ADM4 laser rangefinder
Digital acquisition system: Sander NavDASLaser sample rate: 100 Hz
200 m AGL, constant height (Test Survey)Aircraft altitude: 200 m AGL, draped
May 15 to May 18, 2003 (Test Survey)Dates flown: December 6, 2003 to January 28, 2004SURVEY SPECIFICATIONS
GPS sample rate: 10 Hz
BASE STATION
Gravity data spatial filter: 0% pass at 2 km, 100% pass at 4 km,
Radar altimeter: TRT ERT 530A GPS sample rate: 10 HzGPS receiver: Novatel Millennium, 12 channel, dual frequencyNAVIGATION SYSTEM
Gravimeter sample rate: 128 HzGravimeter sensitivity: 0.1 mGalGravimeter sensor: Sander Geophysics' AIRGravGRAVIMETER
Registration: C-GSGW and C-GSGUType: Cessna Grand Caravan 208-B.AIRCRAFT
SURVEY PARAMETERS
GPS receiver: Novatel Millennium, 12 channel, dual frequency
Overall project management by Timmins Economic Development Corporation.
Contract management, project management by Robert Calhoun, Project Manager, Discover Abitibi Initiative.
Data acquisition, compilation and map production by Sander Geophysics Limited, Ottawa, Ontario.
To enable the rapid dissemination of information, this map hasnot received a technical edit. Every possible effort has been made to ensure the accuracy of the information presented;however, the Ontario Ministry of Northern Development and Mines does not assume liability for any errors that may occur.Users can verify critical information from the corresponding digital profile and gridded data distributed by the Ontario Geological Survey.
CREDITS
Quality assurance and quality control by Laurie Reed, L.E. Reed Geophysical Consultant Inc.
PROCESSING PARAMETERS
COORDINATE SYSTEM
precise correction of the effects of aircraft motion. space, independent of the maneuvers of the aircraft, allowing accelerometers, which remain in a fixed orientation in inertial tuned inertial platform. This platform supports 3 orthogonal Sander Geophysics' airborne gravimeter uses a Schuler-AIRGrav Airborne Gravity System
FIRST VERTICAL DERIVATIVE OF
5 Eötvös
25 Eötvös
100 Eötvös
Pipeline
http://www.discoverabitibi.com/technical-projects.htm, report. Discover Abitibi website: Elieff, S.H.P. 2003. Airborne gravity evaluation survey - project
Magnetic declination in 2004 for the centre of the map area was11.03° W. Magnetic inclination in 2004 for the centre of the maparea was 74.64° N. (Calculated using the International
SOURCES OF INFORMATIONBase map information data derived from Ontario LandInformation Warehouse, Land Information Ontario.
the x (north) and y (east) directions, r is the Earth's radius at of the aircraft, v and v are the velocities of the aircraft in0.00007292115 × cos × v - v ²/(r + h), where is the latitude Eötvös correction = -v ² × cos /((r + h) cos ) - 2 ×
latitude of the aircraft.
aircraft in metres.Free air correction, g = -0.3086 h, where h is height of the
Universal Gravity constant, is density (2.67 g/cm³ for this Bouguer, g = 2 h = 0.096278 h, where is the
Curvature of the earth, g = 1.464 h - 0.3533 h² + 0.000045 h³,
project), h is height of the ground below the aircraft in metres.
where h is height of the ground in kilometres.
Terrain, g , computed using a digital terrain model derived by combining terrain from several sources. Within the survey area,the line data were used to calculate the topography bysubtracting the altimeter data from the altitude of the aircraft above the mean sea level. Terrain data for the area outside the survey blocks were derived by combining 3 arc secondCanadian Digital Elevation Data and 30 arc second USGS
Static correction, g , based on static ground recordings and repeat lines.
Level correction, g , based on line intersections.
Thus Bouguer anomaly = G - g - g - g + g - g - g , where G is the calculated gravity adjusted for Eötvös effect andnormal gravity.
accessed July 2003.
Fairhead, J.D. and Odegard, M.E. 2002. Advances in gravity survey resolution; The Leading Edge, v.21, no.1, p.36.
Ferguson, S. 2000. Experiences with AIRGrav: Results from anew airborne gravimeter; International Association of GeodesySymposia, v.123.
Sander, S., Lavoie, V., Peirce, J. and Charters, R.A. 2003.Advantages of close line spacing in airborne gravimetric surveys; The Leading Edge, v.22, no.2, p.136.
Sander, S., Ferguson, S., Sander L. and Lavoie V. 2002. Measurement of noise on airborne gravity data using even and odd grids; First Break, v.20, no.8.
Bruton, A.M. 2001. A comparison of inertial platform, damped 2-axis platform and strapdown airborne gravimetry; International Symposium on Kinematic Systems in Geodesy, Geomatics and Navigation (KIS2001-Banff, Alberta), June 2001.
Argyle, M., Ferguson, S., Sander, L. and Sander, S. 2000.AIRGrav results: a comparison of airborne gravity data with GSC test site data; The Leading Edge, v.19, no.10, p.1134.
Base maps and map surrounds by the Ministry of NorthernDevelopment and Mines, Sudbury, Ontario.
Test Survey) and 1000 m (other areas)Traverse line spacing: 500 m (northeast Timmins area and Flying speed: 51 m/s averageAircraft positioning: Differential GPS
10 km (northeast Timmins area), and20 km (other areas)
Traverse line direction: along bearing 90° - 270°Control line direction: along bearing 0° - 180°Total line kilometres: 16 132 lkm (14 296 lkm + 1836 lkm
Test Survey)
normal gravity. The sample interval is reduced to 2 Hz.
GRS-80 ellipsoid.
Normal gravity = 9.7803267714 × (1 + 0.00193185138639 ×
Control line spacing: 5 km (Test Survey),
Discover Abitibi InitiativeThe Discover Abitibi Initiative is a regional, cluster economicdevelopment project based on geoscientific investigations of the western Abitibi greenstone belt. The initiative, centred on the Kirkland Lake and Timmins mining camps, will complete 19 projects developed and directed by the local stakeholders.FedNor, Northern Ontario Heritage Fund Corporation andprivate sector investors have provided the funding for the
Initiative Découvrons l’AbitibiL’initiative Découvrons l’Abitibi est un projet de développement économique régional dans une grappe d’industries, projetfondésur des études géoscientifiques de la ceinture de roches
zones minières de Kirkland Lake et de Timmins, mènera à bien 19 projets élaborés et dirigés par des intervenants locaux. FedNor, la Société de gestion du Fonds du patrimoine du Nord de l’Ontario et des investisseurs du secteur privé ont fourni les
Discover Abitibi
Découvrons l' Abitibi
A project of innovation, cooperation and revitalization
Un projet d' innovation, de coopération et de renouvellement
Discover Abitibi
Découvrons l'Abitibi
vertes de l’Abitibi occidental. Cette initiative, centrée sur les
fonds de cette initiative.
x
x y
x y
fa
sb
ec
t
sc
lc
fa sb ec t sc lc
initiative.
first vertical derivative of the terrain-corrected
OF THE BOUGUER GRAVITY
THE BOUGUER GRAVITY CONTOURS
digital terrain data.
NTS References: 32 D/5, 12; 42 A/6, 7, 8, 9, 10, 11
The originally proposed coverage for the Timmins areaproduced significant gaps in parts of the survey area. Whilecarrying out the contracted geophysical surveys (indicated bythe light pink area(s) on the location map), Sander Geophysicscontinued their flight lines through the gaps and, in some areas, extended the lines beyond the originally proposed boundaries(see orange area(s) on the location map). This has produced
ACKNOWLEDGMENT
a continuous data stream and added 2281 line-kilometres of
The final data set for the gravity surveying in the Timmins–Kirkland Lake region also includes a 1836 line-kilometre test survey completed by Sander Geophysics that was flown over a large area north and west of Timmins.
These additional, uncontracted data have been graciouslydonated by Sander Geophysics. The donation has served to further enhance the Discover Abitibi Initiative (DAI) and is gratefully acknowledged by the Timmins Economic Development Corporation, the management committee of DAIand the private sector partners.
uncontracted data, thus resulting in considerable enhancementof the data set.
Terrain-Corrected Bouguer Gravity
MAP 81 925
First Vertical Derivative of the
AIRBORNE GRAVITY SURVEY
Ontario Geological Survey
HIGHWAY 101 CORRIDOR
NORTHEAST TIMMINS AREA
Map 81 925, scale 1:100 000.
Geomagnetic Reference Field.)
Gravity depression
-119.1-59.2-46.4-39.4-34.1-30.3-27.6-25.6-23.8-22.3-20.9-19.7-18.4-17.3-16.2-15.0-13.9-12.8-11.6-10.4-9.3-8.1-6.9-5.8-4.6-3.5-2.4-1.3-0.11.12.33.64.96.27.58.9
10.211.612.914.115.416.617.818.920.221.522.924.325.827.429.130.932.935.137.540.244.168.2
Thackeray Provincial Nature Reserve
11 626
67
101
572
101
577
610
610
803
11
60
65
70
75
80
85
90
05 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
60
65
70
75
80
85
90
05 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95
500000m 600000m
600000m500000m 605000m
5355000m
495000m
5355000m
495000m
5395000m
605000m
5395000m
Anthony
Burnt Hill
The Canyon
Centre Hill
Connaught
Dugwal
Ghost Range
Guibord Hill
Holtyre
Kelso
Mount Kempis
Lawson Hill
Matheson
McCool Hill
Ramore
Shillington
Val Gagne
Vimy Ridge
Warden Hill
Watabeag
Wavell
McIntosh SpringsMonteith
Fielding
Black Island
Burnt Islands Dominion Island
Mount Goldsmith
Iroquois Point
Lightning Point
Poplar Island
Mount Smollett
Island
Island
Island
Cindy
McLeod
Moose
Poplar
Grassy
Point
Point
Frederick House LakeProvincial
Nature Reserve
IslandHand
Night HawkCentre
NorthPeninsula
EastPeninsula
Kettle Lakes
Provincial Park
Shallow River
Provincial
Nature Reserve
Abitibi-de-TroyesProvincial Park
DefiancePeak
MountStringer
LavaflowMountain
Dent Island
Hoyle
Partridge Point
Welsh
Wings
Hill's Landing
Onagon McDougal Point
Pamour
McCART TOWNSHIPCALVERT TOWNSHIP
TEEFY TOWNSHIP
RICKARD TOWNSHIP
KNOX TOWNSHIP
MILLIGAN TOWNSHIPWARDEN TOWNSHIPCOULSON TOWNSHIP
WILKIE TOWNSHIP
WALKER TOWNSHIPCLERGUE TOWNSHIP
DUNDONALD TOWNSHIP
EVELYN TOWNSHIP
GOWAN TOWNSHIP
HOYLE TOWNSHIP
MATHESON TOWNSHIP
STOCK TOWNSHIP TAYLOR TOWNSHIP
CARR TOWNSHIP
BEATTY TOWNSHIP MUNRO TOWNSHIP
McCOOL TOWNSHIPRAND TOWNSHIP LAMPLUGH TOWNSHIP
FRECHEVILLE TOWNSHIP
STOUGHTON TOWNSHIP
MARRIOTT TOWNSHIP
HOLLOWAY TOWNSHIP
HARKER TOWNSHIP
GARRISON TOWNSHIPGUIBORD TOWNSHIP
HISLOP TOWNSHIP
BOWMAN TOWNSHIP
CURRIE TOWNSHIP
BOND TOWNSHIPMACKLEM TOWNSHIP
CODY TOWNSHIP
WHITNEY TOWNSHIP
SHAW TOWNSHIP
CARMAN TOWNSHIP
THOMAS TOWNSHIP
SHERATON TOWNSHIP
EGAN TOWNSHIP
McCANN TOWNSHIP
PLAYFAIR TOWNSHIP
COOK TOWNSHIP
BARNET TOWNSHIP
THACKERAY TOWNSHIP
ELLIOTT TOWNSHIPTANNAHILL TOWNSHIP
DOKIS TOWNSHIP
PONTIAC TOWNSHIP
BEN NEVIS TOWNSHIP
CLIFFORD TOWNSHIP
BISLEY TOWNSHIPMELBA TOWNSHIPBENOIT TOWNSHIPBLACK TOWNSHIP
TOLSTOI TOWNSHIP
McEVAY TOWNSHIPTIMMINS TOWNSHIP
BLACKSTOCK TOWNSHIP
LANGMUIR TOWNSHIP
ELDORADO TOWNSHIP
TULLY TOWNSHIP
LITTLE TOWNSHIP
FallsIroquois
Airport
KERRS TOWNSHIP
St. Patrick Island
Mistaken
Islands
Kenosha
Island
Porquis Junction
Abitibi-de-Troyes
Provincial Park Abitibi-de-Troyes
Provincial Park
DeadmansPoint
Kilburn
GERMAN TOWNSHIP
MICHAUD TOWNSHIP
Lightning Mountain
MerrimanMount
Traverse Hill
Esker Lakes Provincial Park
ONR
Abitibi I.R. 70
QU
EBEC
ON
TAR
IO
Carlyle Lake
Clarice Lake
Frederick House Lake
Froome Lake
Grove Lake
Harker Lake
Lawlar Lake
Northeast Bay
Thackeray Lake
Trollope Lake
Perry Lake
McDiarmid Creek
McIntosh Lake
Salve Lake
Moose Lake
Pinaws Lake
Lake Abitibi
Ghost River Bay
Lower Bay
Makua Bay
O'Brien Bay
Lake
Chest
Ice
LakeClearwater
CarmanBay
Whitefish
River
McL
eod
Cre
ek
BottleyLake
Night Hawk
Lake
Lake
Lake
Lake
Long
Big Club
Gibson
LakeHeart
Warner
LipsettLake
Lake
LakeSheraton
BradleyLake
LakeWelcome
DavisLake
Stock
Lakes
RoundelayLake
Chapman
Lake
RiceLake
Lake
LakeReid
GrassyLake
LevacqueLake
LakeMcMillan
Lake
LakeHeslip
Froude
Pike
Cherry
AndrewSabourin
Lake
Lake
LakeLake
Dell
Turkey
De Courcey
Wildgoose
Turtle
Lake
Lake
Lake
Lake
Lake
LakeFrancesca
Lake
Lake
Lake
Devereaux
McVittie
Butler
Lake
LakeBolton
Talbock
Pike
River
Little
Pike
River
Black
River FitterLake
LakeBarnet
PikeEmens
Dewhirst
Lake Lake
Lake
Death Lake
Loon Lake
Oki
kodo
sik
Nar
row
s
Old Man Lake
Roy Lake
South Bay
Stuart Lake
Benoit Lake
Buskegau River
LakeNerandeau
Lizard Lake
HouseCreek
Wilson
Lake
Meado
w
Cree
k
Creek
Bobs
Bobs Lake
Rayner LakeFord
Lake
Swampy
Creek
Shallow
RiverRed
Deer
Lake
Boundary Bay
River
Mat
taw
asag
a
Lightning
River
Lightning Bay
Ghost
River
Wagoshi
Lake
Munro Lake
River
SlimCreek
Dundo
nald
LakeDundonald
Black
Abitibi
Abitibi
Rive
r
River
River
River
Driftwood
Creek
Camp
Lake Abitibi
Porc
upin
e
River
House
Rive
r
Shall
ow
Rive
r
Painkiller Lake
Cree
k
Salve
Shallow
River
Barto
n Cr
eek
Centre
Creek
Low
Creek
Cree
k
Kech
ewaig
Creek
McCool
Mak
ua
Cree
k
Three Nations
Lake
Goo
se
Cree
k
Pexton
North
Driftwood
Creek
Creek
Crooked
Wabbler
Creek
Drif
twoo
d
Litt l
e
Riv
e r
Grindstone
Creek
Watabeag
Rive
r
Hooker
Creek
BlackRiver
Nickle
Creek
Perry
Creek
Thac
kera
y
Creek
River
Mattawasaga
Redstone
River
WildgooseCreek
McKinley Lake
Ghost Lake
River
Magusi
McDiarmid Lake
Cree
k
Doki
s
Dokis Lake
LakeRanger
LakePontiac
Keith
Lake
Mary Lake
Marten Lake
Webster
LakeDickson Lake
Webster
Creek
Campbell Lake
Lulu Lake
Gourlay Lake
Gaf Lake
Lauramay Lake
Malloch Lake
LakeBlackwater
Raf Lake
Kasba Lake
Creek
Croteau
Nigh
t
Hawk
Riv
er
Radisson
Creek
Rive
r
Whi
t efis
h
Greenock Lake
Kasba
Creek
Frederick
Frederick
Pike
Chesney Bay
Gar
rison
Creek
Okikodosik Bay
River
Barn
etC
reek
48°18'11"
48°45'11"
79°30'13"
48°17'37"
48°44'36"
79°31'01"
81°00'00" 50' 40' 30' 20' 10' 80°00'00" 50' 40'81°08'10"
40'
30'
20'
81°08'05" 81°00'00" 50' 40' 30' 20' 10' 80°00'00" 50' 40'
20'
30'
40'
66
101
112
11
67
101
ONRONR
49°49°81°
81°
80°
80°
LarderLake
Watabeag
Lake
Night
Hawk
Lake
Lake
Abitibi
AbitibiRiver
River
Ri v
e r
Black
River
Wat
a bea
g
Riv er
Whi tefi sh
River
House
Frederick
Larder Lake
Holtyre
Ramore
Matheson
Black CreekAlbert
Monteith
Shillington
Connaught
Hoyle
PorquisJunction
Twin Falls
Potter
Arpin
MaceBingle
Low Bush River
Norembega
Kirkland Lake
South Porcupine
IroquoisFalls
BENOIT
OSSIAN
McELROY
GAUTHIER
ELDORADO
DUNMORE
TERRY
TOLSTOI
McNEIL
FASKEN
BLACKSTOCK
ZAVITZ
GEIKIE
HINCKS
CLEAVER
CARMAN
LANGMUIR
FALLONDOUGLAS
SHAW
THOMAS
ROBERTSON
BADEN
MICHIE
TIMMINS
SHEBA
NORDICA
McEVAY
GRENFELL
BERNHARDT
MAISONVILLE
HOLMESBURT EBY
BOMPAS
LEE
BLACK
OTTO
LEBEL
MORRISETTE
TECK
BOSTON
ARNOLD
McGARRY
HEARST
McVITTIE
KATRINE
McFADDEN
BEN NEVIS
TANNAHILL
HOLLOWAY
FRECHEVILLEMATHESON
WHITNEY
HOYLE
GOWAN
HANNA
TULLY
DUFF
REAUME
McCANN
COULSON
KNOX
MARATHON
MOODYAURORA
STOCK
CLERGUE
CALVERT
CODY MACKLEM
GERMAN
DUNDONALD
McCART
NEWMARKET
EVELYN
LITTLE
MANN
EGAN
CURRIE
TAYLOR
BOND
SHERATON
BOWMAN
RICKARD
WALKER
TEEFY
CARR
WILKIE
ST. JOHN
BROWER
PYNE
WESLEY
SHERRINGMORTIMER
EDWARDS
MELBA
BARNET
MICHAUDGUIBORD
PLAYFAIR
HISLOP
COOK
MUNRO
WARDEN
KERRS
BEATTYMcCOOL
MILLIGAN
HARKER
BISLEY
THACKERAY
GARRISON
CLIFFORD
ELLIOTT
LAMPLUGHRAND
STEELEPURVIS
GALNA
BOWYERBONIS
BERRY
SARGEANT
PONTIAC
DOKIS
STOUGHTON
MARRIOTT
Virginiatown
QU
EBE
C
Location Map 1 cm equals 15 km