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EN CARD BROCK THORAH DALTON RYDE UXBRIDGE MARA SCOTT DRAPER 48 RAMA 12 GEORGINA Gravenhurst 11 MORRISON (S) EAST MORRISON (N) NORTH 2 km 404 MUSKOKA (S) GWILLIMBURY GWILLIMBURY MUSKOKA (N) Orillia ORO WOOD (S) MATCHEDASH WEST WOOD (N) GWILLIMBURY 400 MEDONTE tario, Ministry of Natural tario, Ministry 93 BAXTER ESSA VESPRA 1 TAY , the Ministry of Northern , the Ministry TECUMSETH nt data (ASCII and Geosoft® l Simcoe County area; Ontario l Simcoe County ons for gravimeter stations; the Ministry of Northern the Ministry l Simcoe County area; Ontario l Simcoe County FLOS GIBSON NTIO form: e be made in the following ontrol by Desmond Rainsford, ontrol by 82 770 ORO TOS Natural Resources and Forestry. gravity system—changes in system—changes gravity ADJALA ion area to discuss their project. entre of the map area was 80° SUNNIDALE Midland MONO TINY 82 771 CREDITS 89 MULMUR 0 MAP 82 771 Scale 1:50 000 REFERENCES I.R. 30 NOTTAWASAGA MELANCTHON OSPREY Ontario Geological Survey () (Lake COLLINGWOOD Collingwood Nottawasaga SOURCES OF INFORMATION NTS References: 31 D/4, 5, 12; 41 A/1, 8, 9 PROTON GROUND GRAVITY SURVEY 1 km ARTEMESIA Residual of the Bouguer Anomaly EUPHRASIA Geophysics, v.4, p.184-194. Geophysics, international gravity base values and anomaly values; base values and anomaly international gravity v.44, p.1352-1366. Geophysics, ST. VINCENT ground gravity data, grid and poi ground gravity formats) and vector data, centra Data Set 1080. Geophysical Geological Survey, centra of the Bouguer anomaly, Map 82 771, scale 1:50 000. Geological Survey, 26 45° M HOLLAND 10 HA EGREMONT Hammer, S. 1939. Terrain correcti Woollard, G.P. 1979. The new N GLENELG © Queen's Printer for Ontario, 2015. © the permission of Director, This map is published with Ontario Geological Survey. DE Y Base map information derived from the Land Information Ontario Data Warehouse, Land Information On scale 1:20 000. Resources and Forestry, DEM information derived from 10 m 2.0 grids Land of Information Ontario, Ministry Magnetic declination for the c 10°17.6' W in 2015. approximately Data acquisition, data compilation and map production by Inc., Val-d’Or, Quebec. Abitibi Geophysics Base maps and map surrounds by Ontario. Development and Mines, Sudbury, the Contract management, base maps and map surrounds by Ontario. of Northern Development and Mines, Sudbury, Ministry c assurance and quality Quality Ontario. Sudbury, Ontario Geological Survey, of possible effort has been made to ensure the accuracy Every the information presented; however errors for any Development and Mines does not assume liability critical information. occur. Users should verify that may are available from the Corresponding digital data for this survey publication: Ontario Geological Survey following surveys, 2015. Ontario geophysical Ontario Geological Survey Issued 2015. be quoted if credit is given. Information from this publication may It is recommended that referenc residual survey, 2015. Ground gravity Ontario Geological Survey S Users of OGS products are encouraged to contact those be traditional territories may Aboriginal communities whose located in the mineral explorat Location map 1 cm equals 15 km depression Gravity 5 mGal contour average absolute drift for reading error atistics, typical This included the application al and a standard deviation 2014: Geodetic tie-in, gravity al drift, latitude, free air and rrain corrections were applied rrain corrections were stations were collected during stations were station #9999 was established station #9999 was Geodetic Reference System stance of 50 m from the gravity he instrument scale factor for new ground gravity measure- ground gravity new tion were 0.055 and 0.024 mGal tion were ion establishment and reading 0 cm and a standard deviation was confirmed against the was the stations were repeated the stations were rnational Gravity Standardization rnational Gravity Bouguer anomaly to create the Bouguer anomaly ed to CGSN gravity base station ed to CGSN gravity milligal (mGal) rveying using dual-frequency GPS using dual-frequency rveying re processed and checked by 2.8 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -1.2 -1.4 -1.6 -1.8 -2.0 -2.2 -2.4 -2.6 -2.8 LEGEND the Bouguer or (reduced observed) 5.0 km of the Bouguer values. This surface DESCRIPTIVE NOTES STATION LOCATIONS SURVEY PARAMETERS 0.2 mGal contour 1 mGal contour stations Gravity RESIDUAL BOUGUER GRAVITY GRID Five (5) SmartNet™ RTK base st ations surrounding the project used. area were from 5 geodetic points (673117, RTK GPS surveying 28U131R, 65U9504, 84U123 and M053009; Natural poor SmartNet™ used in areas with Resources Canada) were RTK coverage. for all units. an average repeat of 1. with of 1.75 cm. Scintrex®Type: CG-5 Autograv™ (2 units) Reading resolution: 0.001 mGal meters each of the 2 gravity (CGSN). Standardization Network Canadian Gravity area, central Simcoe County Duntroon 9023-1991, located in base Ontario. One secondary using the ABABA sequence. The 0.027 mGal. the base tie-in was meters during produc gravity after tidal and instrument height corrections. an average repeat of 0.008 mG of 0.015 mGal. Based on these st is estimated to be 0.015 mGal (maximum 0.039 mGal). error on the Bouguer values is estimated to be better Typical than 0.026 mGal. September 30 to November 5, meter calibrations, base stat of 4380 stations. Projection: Universal Transverse Mercator Datum: NAD83 CSRS Central meridian: 81°00' W (UTM zone 17N) Central scale factor: 0.9996 False easting: 500 000 m False northing: 0 m Ellipsoid: WGS84 Geoid model: HTv2.0 GPS ACQUISITION Rapid real-time kinematic su receivers. Instrumentation: Leica® Viva® GS15 (3 units) and 2 cm vertically Average precision: 1.0 cm horizontally Re-occupied stations: 5.5% of GRAVITY ACQUISITION Instrumentation: check, t Calibration: As a quality is ti Tie-in: survey The gravity drift: The average absolute drifts per loop for the 2 Survey repeated with the stations were Re-occupied stations: 5.2% of SURVEY SPECIFICATIONS dates and details: Survey Nominal station separation: 100 m and 200 m. CO-ORDINATE SYSTEM Introduction The data on this map represent ments. Data from a total of 4380 the fall of 2014. The data we Inc. All stati on locations are indicated the Abitibi Geophysics symbols. map by Data Reduction processed according to the observations were gravity The raw the Inte standards set forth by 1971 (IGSN71) and the Network 1967 (GRS67), see Woollard 1979. of standard Earth tide, instrument used for the of 2.40 g/cm³ was Bouguer corrections. A density Bouguer correction. Near zone te out to a di to the Bouguer gravity derived from field stations. The near zone correction was observations of ground slope and calculated using Hammer's (Hammer 1939) formula for zones B and C. Map Residual Anomaly subtracting the calculated by field was The residual anomaly field from regional gravity upward estimated by values. The regional field was gravity continued at height of then subtracted from the was residual anomaly. RESIDUAL BOUGUER GRAVITY CONTOURS 44°13'38" 44°32'31" 25' 30' 20' 15' 4932000 m 4900000 m 4899000 m 28 27 26 25 24 23 22 04 03 02 01 31 30 29 08 07 06 05 18 11 10 09 16 21 20 19 17 15 14 13 12 79°37'41" 79°38'07" 11

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PARK C Brewster's Lake C 556000 m 556000 m VALLEY McIntyre PROVINCIAL PRETTY RIVER 18 17 31 26 25 24 06 05 04 03 23 22 21 20 02 12 11 10 09 08 07 19 16 15 14 13 30 29 28 27 01 80°18'27" 80°18'40" 30' 25' 20' 15' 4932000 m 4899000 m 4900000 m 44°14'00" 44°32'53"