The MapPlace - 2005 Geophysical Surveys
High Sensitivity Airborne Gamma-Ray Spectrometric and Aeromagnetic Surveys Central BC
GSC Open Files: 5284, 5285, 5286, 5287, 5288, 5289, 5290, 5291, 5292, 5293 by J.M. Carson, R. Dumont, J. Potvin, R.B.K. Shives, B.J.A. Harvey, J. Buckle, B. Lane, M. Cathro (10 open files, 10 sheets each)
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Details: The Geological Survey of Canada released multisensor (gamma ray spectrometric and magnetic) airborne geophysical information for 10 areas of central British Columbia. These surveys were conducted by Fugro Airborne Surveys under contract to the Geological Survey of Canada (GSC). They were funded by a number of provincial, industry and First Nation partners, including the British Columbia and Yukon Chamber of Mines' "Rocks to Riches" program, Richfield Ventures Corp., Amarc Resources Ltd., Yekooche First Nation, Yankee Hat Minerals Ltd., Serengeti Resources Inc., and GWR Resources Inc., and supported by Natural Resources Canada as part of the Earth Sciences Sector's Northern Resources Development Program.
We would like to acknowledge Cal Data Inc. for the image processing into georeferenced TIFF and PNG images.
View 2005 Geophysical Surveys Map
How the Magnetic and Radiometric Maps Can be Used:
Multiparameter (gamma-ray, magnetic) geophysical surveys are useful in mineral exploration and bedrock mapping studies. In the Quesnel Trough, these surveys are particularly useful in exploring for alkalic porphyry Cu-Au porphyry deposits like Mt. Polley, or related deposits like QR. The potassium, potassium/thorium, magnetic total field and magnetic vertical gradient maps can be used to help identify potassic alteration and magnetite enrichment/depletion zones associated with copper-gold mineralization, and also help in mapping lithologies and structures. For additional information on the interpretation of radiometric maps, go to http://www.collectionscanada.gc.ca/webarchives/20060303013232/http://gsc.nrcan.gc.ca/gamma/index_e.php.
Survey Summary:
In 2004 and 2005, Fugro Airborne Surveys completed nine multi-sensor airborne geophysical surveys in the central region of British Columbia for the Geological Survey of Canada, the British Columbia and Yukon Chamber of Mines, Yekooche First Nation, and five industry partners, including Serengeti Resources Inc., Yankee Hat Minerals Ltd.,Richfield Ventures Corp.,GWR Resources Inc., and Amarc Resources Ltd. The Geological Survey of Canada provided survey supervision and quality control. The purpose of the surveys was to obtain quantitative gamma-ray spectrometric and aeromagnetic data. The surveys were flown over two seasons, from September 18 to November 17, 2004 and June 15 to August 8, 2005 using AStar 350-B2 and 350-B3 helicopters, C-GECL and C-FGSC.
| GSC Open File |
NTS sheet (parts of) |
Title |
Scale |
| 5284 |
93N/6, 93N/10, 93N/11, 93N/7 |
Indata Lake |
1:50 000 |
| 5285 |
93N/8, 93O/5 |
Sylvester Creek |
1:50 000 |
| 5286 |
93N/1, 93K/16 |
Wittichica Creek |
1:20 000 |
| 5287 |
93K/6, 93K/7, 93K/3, 93K/2 |
Taltapin Lake |
1:20 000 |
| 5288 |
93G/1, 93G/8, 93B/16 |
Cottonwood |
1:50 000 |
| 5289 |
93H/4, 93A/13 |
Wells |
1:50 000 |
| 5290 |
93A/12 |
Hydraulic |
1:50 000 |
| 5291 |
92P/14 |
Lac La Hache |
1:20 000 |
| 5292 |
93A/3, 93A/2, 93A/6, 93A/7, 92P/14 |
Eagle (Murphy) Lake |
1:50 000 |
| 5293 |
93A/2, 93A/3, 92P/14, 92P/15 |
McKinley Creek |
1:50 000 |
Digital profile and gridded data for this survey can be downloaded free of charge from the Geoscience Data Repository for Geophysical Data of ESS Geophysical and Geochemical data. Customized line and/or gridded digital data may be obtained, for a fee, from the Radiation Geophysics Section, Ottawa: Telephone: (613) 996-3695 or (613) 995-1235; Fax: (613) 996-3726; E-mail: natgam@nrcan.gc.ca.
Geophysical variables include:
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Natural air absorbed dose rate (nGy/h) |
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Potassium (%) |
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Uranium (ppm) |
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Thorium (ppm) |
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Uranium/thorium |
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Uranium/potassium (ppm/%) |
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Thorium/potassium (ppm/%) |
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Ternary radioelement image |
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Residual total magnetic field (nT) |
Analogue and digital products include data for eight radiometric and two magnetic parameters:
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