AIRBORNE SURVEY SPECIFICATIONS A) Survey Survey name: QUEST Project Client: Geoscience BC Job No.: 7042 Location: Central BC Base of operation: Prince George, Williams Lake, & MacKenzie, B.C. Survey date: July 29 - November 1, 2007 Survey company name: Geotech Ltd. Total line-km: 11,622.5 in two blocks Aircraft type: AStar-350 B2, Registration C-GTSZ & AStar-350 B4 Registrstion C-GTXK Archive creation date: December, 2007 B) Airborne Magnetometer Model: Geometrics Type: Cesium-vapour Sample Interval: 10 Hz (0.1 seconds); 2-3 metres Sensitivity: 0.02 nT Mount: Towed bird, 15 metres below helicopter Nominal sensor height above ground: 60 metres C) Airborne Electromagnetics Model: Geotech VTEM7 Type: Concentric Rx-Tx Time Domain transmitter and receiver coils are horizontal Number of channels: 27 (0.099 - 9.245 ms) Sample Interval: 10 Hz (0.1 seconds); 2-3 metres Mount: Bird towed 42 metres below helicopter Transmitter Loop diameter: 26 m Transmitter Number of turns: 4 Receiver Loop diameter: 1.1 m Receiver number of turns: 100 Receiver effective area: 113.1 m2 Pulse width: 4.5 milliseconds including turn on and turn off. Waveform shape: Trapezoid 150Hz quarter sine wave turn on ~ 1.65 milliseconds flat topped pulse ~ 1.2 milliseconds 150Hz quarter sine wave turn off ~ 1.65 milliseconds Current: 235 Amp Peak Dipole moment: 503,000 NIA Nominal Height above ground: 33 metres All EM data is normalized by transmitter current and effective area (NIA) and by the receiver coil area. The effective transmitter dipole moment is 1Am^2 and the effective receiver area is 1m^2. D) EM Time Gates Twenty-seven time gates, from 99 microsecond to 9245 microsecond, as follows VTEM Decay Sampling scheme (Microseconds) Centre Start End Width 99 91 110 19 120 110 131 21 141 131 154 24 167 154 183 29 198 183 216 34 234 216 258 42 281 258 310 53 339 310 373 63 406 373 445 73 484 445 529 84 573 529 628 99 682 628 750 123 818 750 896 146 974 896 1063 167 1151 1063 1261 198 1370 1261 1506 245 1641 1506 1797 292 1953 1797 2130 333 2307 2130 2526 396 2745 2526 3016 490 3286 3016 3599 583 3911 3599 4266 667 4620 4266 5058 792 5495 5058 6037 979 6578 6037 7203 1167 7828 7203 8537 1334 9245 8537 10120 1584 Navigation type: NovAtel's WAAS, OEM4-G2-3151W GPS receiver GPS Antenna position: tail of the helicopter Radar altimeter: Terra TRA3000/TRI-40 Radar Antenna position: under cockpit AIRBORNE GEOPHYSICAL DIGITAL ARCHIVE A) Disc Directory There are three main directories on the disc: \Data contains databases, \Maps contains Geosoft grids and maps, \Report contains a copy of the report in PDF format and Google Earth file as described below. \Data: 7042-Main.gdb: The main block database containing positional and geophysical data 7042-MtMill.gdb: The Mt. Milligan database containing positional and geophysical data 7042_106_wform.gdb: The waveform of the receiver at 10 µs intervals 7042_106_wform.xyz: The waveform of the receiver at 10 µs intervals in xyz format \Maps: Main Block: All maps at 1:250,000 scale with topographic base. A link to the Geosoft free viewer is provided. FP_250k_MainNorth.map Plate 1N - Flight Path, North Sheet FP_250k_MainSouth.map Plate 1S - Flight Path, South Sheet EMB_250k_MainNorth.map Plate 2N - EM B-Field Offset Profiles, North Sheet EMB_250k_MainSouth.map Plate 2S - EM B-Field Offset Profiles, South Sheet Mag_250k_MainNorth.map Plate 3N - TMI grid and contours, North Sheet Mag_250k_MainSouth.map Plate 3S - TMI grid and contours, South Sheet Mag2_Main.grd Main Block TMI grid with gi file Mt. Milligan: All maps at 1:10,000 scale with topographic base EMB_10k_MtMill.map EM B-Field Offset Profiles Mag_10k_MtMill.map TMI grid and contours Mag2_MtMill.grd Mt. Milligan Block TMI grid with gi file Each Geosoft grid file (*.grd) has an associate *.gi metadata file containing grid projection information. B) Database Structure Database in Geosoft GDB format, containing the following channels: X X positional data (metres – NAD83, UTM zone 10 north) Y Y positional data (metres – NAD83, UTM zone 10 north) Longitude Longitude data (degree – WGS84) Latitude Latitude data (degree – WGS84) Z GPS antenna elevation (metres – GPS ellipsoid) Date Flight Date (DD/MM/YYYY) FltNo Flight Number Radar Helicopter terrain clearance from radar altimeter (metres - AGL) DEM Digital elevation model (metres) gTime GPS time (seconds of the day) Mag1 Raw Total Magnetic field data (nT) Basemag Magnetic diurnal variation data (nT) Mag2 Total Magnetic field diurnal variation corrected data (nT) SF[9] dB/dt 99 microsecond time channel (pV/(A*m^4)} SF[10] dB/dt 120 microsecond time channel (pV/(A*m^4)) SF[11] dB/dt 141 microsecond time channel (pV/(A*m^4)} SF[12] dB/dt 167 microsecond time channel (pV/(A*m^4)} SF[13] dB/dt 198 microsecond time channel (pV/(A*m^4)} SF[14} dB/dt 234 microsecond time channel (pV/(A*m^4)} SF[15] dB/dt 281 microsecond time channel (pV/(A*m^4)} SF[16] dB/dt 339 microsecond time channel (pV/(A*m^4)} SF[17] dB/dt 406 microsecond time channel (pV/(A*m^4)} SF[18] dB/dt 484 microsecond time channel (pV/(A*m^4)} SF[19] dB/dt 573 microsecond time channel (pV/(A*m^4)} SF[20] dB/dt 682 microsecond time channel (pV/(A*m^4)} SF[21] dB/dt 818 microsecond time channel (pV/(A*m^4)} SF[22] dB/dt 974 microsecond time channel (pV/(A*m^4)} SF[23] dB/dt 1151 microsecond time channel (pV/(A*m^4)} SF[24] dB/dt 1370 microsecond time channel (pV/(A*m^4)} SF[25] dB/dt 1641 microsecond time channel (pV/(A*m^4)} SF[26] dB/dt 1953 microsecond time channel (pV/(A*m^4)} SF[27] dB/dt 2307 microsecond time channel (pV/(A*m^4)} SF[28] dB/dt 2745 microsecond time channel (pV/(A*m^4)} SF[29] dB/dt 3286 microsecond time channel (pV/(A*m^4)} SF[30] dB/dt 3911 microsecond time channel (pV/(A*m^4)} SF[31] dB/dt 4620 microsecond time channel (pV/(A*m^4)} SF[32] dB/dt 5495 microsecond time channel (pV/(A*m^4)} SF[33] dB/dt 6578 microsecond time channel (pV/(A*m^4)} SF[34] dB/dt 7828 microsecond time channel (pV/(A*m^4)} SF[35] dB/dt 9245 microsecond time channel (pV/(A*m^4)} BF[9] B-field 99 microsecond time channel (pV*ms)/(A*m^4) BF[10] B-field 120 microsecond time channel (pV*ms)/(A*m^4) BF[11] B-field 141 microsecond time channel (pV*ms)/(A*m^4) BF[12] B-field 167 microsecond time channel (pV*ms)/(A*m^4) BF[13] B-field 198 microsecond time channel(pV*ms)/(A*m^4) BF[14] B-field 234 microsecond time channel (pV*ms)/(A*m^4) BF[15] B-field 281 microsecond time channel (pV*ms)/(A*m^4) BF[16] B-field 339 microsecond time channel (pV*ms)/(A*m^4) BF[17] B-field 406 microsecond time channel (pV*ms)/(A*m^4) BF[18] B-field 484 microsecond time channel (pV*ms)/(A*m^4) BF[19] B-field 573 microsecond time channel (pV*ms)/(A*m^4) BF[20] B-field 682 microsecond time channel (pV*ms)/(A*m^4) BF[21] B-field 818 microsecond time channel (pV*ms)/(A*m^4) BF[22] B-field 974 microsecond time channel (pV*ms)/(A*m^4) BF[23] B-field 1151 microsecond time channel (pV*ms)/(A*m^4) BF[24] B-field 1370 microsecond time channel (pV*ms)/(A*m^4) BF[25] B-field 1641 microsecond time channel (pV*ms)/(A*m^4) BF[26] B-field 1953 microsecond time channel (pV*ms)/(A*m^4) BF[27] B-field 2307 microsecond time channel (pV*ms)/(A*m^4) BF[28] B-field 2745 microsecond time channel (pV*ms)/(A*m^4) BF[29] B-field 3286 microsecond time channel (pV*ms)/(A*m^4) BF[30] B-field 3911 microsecond time channel (pV*ms)/(A*m^4) BF[31] B-field 4620 microsecond time channel (pV*ms)/(A*m^4) BF[32] B-field 5495 microsecond time channel (pV*ms)/(A*m^4) BF[33] B-field 6578 microsecond time channel (pV*ms)/(A*m^4) BF[34] B-field 7828 microsecond time channel (pV*ms)/(A*m^4) BF[35] B-field 9245 microsecond time channel (pV*ms)/(A*m^4) PLinef Power line monitor Electromagnetic B-field and dB/dt data is found in array channel format between indexes 9 – 35, as described above. Note units are ms=milliseconds, A=Amperes, pV=picovolts, m=metres Channel times are the centre of the channel window Flown and processed by: Geotech Limited 245 Industrial Parkway North Aurora, Ontario, L4G 4C4 Phone: 905.841.5004 Fax: 905.841.0611 www.geotechairborne.com December, 2007.