View Toodoggone Geophysics Map

Survey Background

TOODOGGONE MULTISENSOR GEOPHYSICAL SURVEY
Open File 2004-8
Helicopter-borne gamma ray spectrometric and magnetic total field geophysical survey, Toodoggone Area, British Columbia
(Parts of NTS 94D/15, E/2,3,6,7,10,11)
R.B.K. Shives, J.M. Carson, K.L. Ford, P.B. Holman, L. Diakow

In 2003 the BC Ministry of Energy, Mines and Petroleum Resources and the Geological Survey of Canada conducted a multisensor (gamma-ray spectrometric, magnetic total field) helicopter-borne geophysical survey in the Toodoggone area, British Columbia, Canada. Flight lines were oriented NE-SW, spaced at 400 m intervals. The survey was flown under contract, by Fugro Airborne Surveys. The survey was funded by the British Columbia Ministry of Energy, Mines and Petroleum Resources and Natural Resources Canada through the Targeted Geoscience Initiative, and by a consortium of companies including Bishop Resources Inc., Finlay Minerals Ltd., Northgate Exploration Ltd., Sable Resources Ltd.,and Stealth Minerals Ltd.

Purpose and Methodology

The surveys were completed during August and September 2003 using an Aerospatiale AS350 helicopter. The flight path was recovered using a post-flight differential Global Positioning System. A vertically mounted video camera was used for verification of the flight path. The traverse lines were flown at an average spacing of 400 m for Toodoggone, (500 m for Horsefly and 100 m for Imperial Mt. Polley) with control lines flown at 4000 m intervals (2000 m for Imperial Mt. Polley). Helicopter flight height was maintained at an average ground clearance of 135 m (60 m).

The gamma ray spectrometry data were recorded at a 1.0 second sample rate using a 256-channel Exploranium GR820 spectrometry system with 33.6 liters of downward-looking and 4.2 liters of upward-looking sodium iodide detectors. The aeromagnetic data were recorded at a 0.1 second sample rate using a 0.01 nT split-beam line cesium vapour magnetometer suspended below the helicopter.

Final results will be presented in GSC and BCGS Open File formats in May 2004. The Open Files will consist of digital data (Geosoft compatible line and gridded formats) and colour interval maps at 1:20,000 and 1:50,000 scales, for 10 layers (listed below). Map images will be presented as georeferenced .tif files for easy import into GIS programs and as .pdf files with marginal notes, legend and topographic base information. Data will be made available for purchase as digital line or grid data on CD-ROM (from GSC only), in paper format as print-on-demand colour maps from GSC (only) and as web-viewable, downloadable images in PDF format, at no cost, from BCGS and GSC-NATGAM websites.

Analogue and digital products include data for eight radiometric and two magnetic parameters:

British Columbia Mineral Tenure Information

Clients are reminded that accurate and up-to-date mineral tenure maps are the paper (counter) maps at the Mining Recorder's (Government Agent) offices. The claim information on the MapPlace MTO layer is current to the previous day.  The PDF maps (Ministry of Sustainable Resource Management) are out-of-date and should not be relied upon for staking decisions.

The Toodoggone survey is within the Omineca and Liard Mining Divisions and maps are available from the Mining Recorder's offices in Smithers (Omineca MD) and Vancouver (Liard MD).

The BCGS (TRIM) claim maps relevant for the Toodoggone Geophysical Surveys are:  094D.087, 097; 94E.006-007, 014-017, 024-027, 033-037, 043-047, 053-056, 065.

Locations to View Paper Maps

Vancouver Mineral Development Office, BC Ministry of Energy, Mines and Petroleum Resources
300 - 865 Hornby Street, Vancouver, B.C.
Contact Tom Schroeter, Senior Regional Geologist,                604 660-2812        
or Larry Diakow, Senior Project Geologist,                250 952-0430        

Mining Operations Branch, BC Ministry of Energy, Mines and Petroleum Resources
162 Oriole Road, Kamloops, B.C.
Contact: Mike Cathro, Regional Geologist,                250 371-6069        

Mining Operations Branch, BC Ministry of Energy, Mines and Petroleum Resources
3793 Alfred Avenue, Prince George, B.C.
Contact: Bob Lane, Regional Geologist,                250 561-5606        

For information contact

Brian Grant, BC Geological Survey,
B.C. Ministry of Energy, Mines and Petroleum Resources,
PO Box 9333 Stn Prov Govt,
Victoria, B.C.   V8W 9N3
E-mail: Brian.Grant@gov.bc.ca
Telephone:                (250) 9...        Fax: (250) 952-0381
Website: http://www.em.gov.bc.ca/geology/

3. Available only from the Radiation Geophysics Section in Ottawa, on demand.