The MapPlace - Mount Milligan Area Geophysics
(BCMEM OF 2005-9
/
GSC OF 2535 &
GSC OF 2801;
BCMEM OF 2005-14;
BCMEM OF 2005-15) |
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| Details: Mount Milligan
Geophysics covers four geophysical surveys: The 1991 Mount Milligan
survey is represented in
BCMEM Open File 2005-9
and
GSC OF 2535 and
the 1995 Inzana-Salmon Lake (Mount Milligan South) survey is represented in
BCMEM Open File 2005-9
and
GSC Open File 2801.
The 2004
Mount Sylvester survey is represented in
BCMEM Open File 2005-14
and the 2004 Fran
Property survey is represented in
BCMEM Open File 2005-15. The files are also available for
download in georeferenced TIF and PNG formats and GeoSoft gridded data
(.grd) format. The surveys were posted to MapPlace April 8, 2005.
View Mount Milligan Geophysics Map
Survey Summaries:
Multiparameter (gamma-ray, magnetic) geophysical surveys
are useful in mineral exploration and bedrock mapping studies. These
surveys cover rocks of the Quesnel Terrane, a belt prospective for bulk
tonnage copper-gold deposits similar to the well-known Mount Milligan
deposit. For additional information on the GSC NATGAM program and
interpretation of radiometric maps, go to
http://gsc.nrcan.gc.ca/gamma/index_e.php.
These surveys were published to MapPlace on April 8,
2005. The MapPlace data includes digital gridded images for 2 magnetic and
7 radiometric parameters for each survey area. The downloadable files from
the British Columbia Ministry of Energy and Mines website will be in
georeferenced TIF – tagged image and PNG formats (UTM NAD 83 and Albers
projections) and GRD - Geosoft gridded data format (UTM Nad 83 only). PDF
theme files area also available. A full product release (in late
spring 2005) of the Mount Sylvester and Fran Property surveys will be made
by the Geological Survey of Canada as a series of Open Files, including
printed colour maps, images of the printed maps in PDF format, and digital
line and grid data.
MOUNT MILLIGAN GEOPHYSICAL SURVEY
BCMEM Open File 2005-9
/
GSC Open File 2535
Helicopter-borne gamma ray spectrometric and magnetic total field
geophysical survey, Mount Milligan area, British Columbia
(Parts of NTS 93N/01; 93N/02SE;
93N/02NE; 93O/04SW; 93O/04NW)
Shives, R.B.K.,
Geological Survey of Canada
In 1991 the Geological Survey of Canada conducted a multisensor
(gamma-ray spectrometric, magnetic total field) helicopter-borne
geophysical survey in the Mount Milligan area, British Columbia,
Canada. This data was published as
GSC Open File 2535
in 1992 and to MapPlace as
BCMEM Open File 2005-9
on April 8, 2005.
INZANA-SALMON LAKES GEOPHYSICAL SURVEY
BCMEM Open File 2005-9
/
GSC Open File 2801
Helicopter-borne gamma ray spectrometric and magnetic total field
geophysical survey, Inzana- Salmon Lakes area, British Columbia
(Parts of NTS
93J/13SW; 93J/13NW; 93K/15SW; 93K/15NW; 93K/16)
Shives, R.B.K, Holman, P.B. and Rebolledo, L., Geological Survey of Canada
In 1995 the Geological Survey of Canada conducted a multisensor
(gamma-ray spectrometric, magnetic total field) helicopter-borne
geophysical survey in the Inzana-Salmon Lakes (Mount Milligan
South) area, British Columbia, Canada. This data was published as
GSC Open File 2801 in 1995 and to
MapPlace as
BCMEM Open File 2005-9
on April 8, 2005.
MOUNT SYLVESTER GEOPHYSICAL SURVEY
BCMEM Open File 2005-14
Helicopter-borne gamma ray spectrometric and magnetic total field
geophysical survey, Mount Sylvester area, British Columbia
(Parts of NTS 93N/8; 93O/5)
Shives, R.B.K., Carson, J.M., Dumont, R. and Holman,
P.B., Geological Survey of Canada,
and R. Lane,
BC Ministry of Energy and Mines
In 2004 the Geological Survey of Canada conducted a multisensor
(gamma-ray spectrometric, magnetic total field) helicopter-borne
geophysical survey in the Mount Sylvester area, approximately due
west of MacKenzie, British Columbia, Canada. Flight lines were oriented
E-W, spaced at 500 m intervals. The survey was flown under contract by
Fugro Airborne Surveys. Funding was provided by the British Columbia and
Yukon Chamber of Mines Rocks to Riches Program, under a project submitted
by the District of MacKenzie. Support for the Geological Survey of
Canada’s Radiation Geophysics Section, acting as the Scientific Authority
for the survey, was provided under Natural Resources Canada – Earth
Sciences Sector’s Northern Resources Development Program. This survey
covers rocks of the Quesnel Terrane, a belt prospective for bulk tonnage
copper-gold deposits similar to the well-known Mount Milligan deposit.
This data was published to MapPlace as
BCMEM Open File 2005-14
on April 8, 2005. A full product release (in late spring 2005) will be
made by the Geological Survey of Canada as a series of Open Files,
including printed colour maps, images of the printed maps in PDF format,
and digital line and grid data.
FRAN PROPERTY GEOPHYSICAL SURVEY
BCMEM Open File 2005-15
Helicopter-borne gamma ray spectrometric and magnetic total field
geophysical survey, Fran Property Area, British Columbia
(Parts of NTS 93K/16; 93N/1)
Shives, R.B.K., Carson, J.M., Dumont, R., Holman, P.B. and Wells R., Geological Survey of Canada
In 2004 the Geological Survey of Canada conducted a multisensor
(gamma-ray spectrometric, magnetic total field) helicopter-borne
geophysical survey in the Fran Property Area, southwest of Mount
Milligan, British Columbia, Canada. Flight lines were oriented N-S, spaced
at 150 m intervals. The survey was flown under contract by Fugro Airborne
Surveys. Funding was provided by Yankee Hat Industries Corp. Support for
the Geological Survey of Canada’s Radiation Geophysics Section, acting as
the Scientific Authority for the survey, was provided under Natural
Resources Canada – Earth Sciences Sector’s Northern Resources Development
Program.
This data was published to MapPlace as
BCMEM Open File 2005-15
on April 8, 2005. A full product release (in late spring 2005) will be
made by the Geological Survey of Canada as a series of Open Files,
including printed colour maps, images of the printed maps in PDF format,
and digital line and grid data.
Analogue and
digital products include data for eight radiometric and two magnetic
parameters:
| MapPlace
Layer Themes |
Mount Milligan
OF 2005-9
PDF Theme Files
see Note 1 |
Inzana-Salmon Lake
OF 2005-9
PDF Theme Files
see Note 1 |
Mount Sylvester
OF 2005-14
PDF Theme Files
see Note 1 |
Fran Property
OF 2005-15
PDF Theme Files
see Note 1 |
| MTF - Magnetic total field (nT) |
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CVG - Calculated magnetic vertical gradient (computed, nT/m) |
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POT - Potassium (K, %) |
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URA - equivalent Uranium (eU, ppm) |
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THO - equivalent Thorium (eTh, ppm) |
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ADRN - Natural air absorbed dose rate (ADRN, nGy/h) |
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RUT - equivalent Uranium/equivalent Thorium (eU/eTh) |
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RUK - equivalent Uranium/Potassium (eU/K, ppm/%) |
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RTK - equivalent Thorium/Potassium (eTh/K, ppm/%) |
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TER - Ternary radioelement map (K, eU, eTh) |
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| 1:250K Scale Geology, Mineral Occurrences &
Titles |
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| All Themes in one file (11 by 17 images) |
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| File
Downloads |
Zip Files |
Zip Files |
Zip Files |
Zip Files |
| Georeferenced TIFF files (UTM Zone 10 NAD 83) |
M_tif_Z10.zip
(6.8MB) |
MS_tif_Z10.zip
(6.4MB) |
Syl_tif_Z10.zip
(0.8MB) |
Fran_tif_Z10.zip
(1.0MB) |
| Georeferenced TIFF files (Albers NAD 83) |
M_tif_AL.zip
(6.8MB) |
MS_tif_AL.zip (6.7MB) |
Syl_tif_AL.zip (0.8MB) |
Fran_tif_AL.zip
(1.0MB) |
| Georeferenced PNG files (UTM Zone 10 NAD 83) |
M_png_Z10.zip (3.3MB) |
MS_png_Z10.zip
(3.2MB) |
Syl_png_Z10.zip
(0.4MB) |
Fran_png_Z10.zip (0.8MB) |
| Georeferenced PNG files (Albers NAD 83) |
M_png_AL.zip (3.4MB) |
MS_png_AL.zip (3.3MB) |
Syl_png_AL.zip (0.4MB) |
Fran_png_AL.zip
(0.7MB) |
| Original GSC SurView data files for viewing and
printing only (.gri & .grx) |
M_gri.zip
(22MB) |
MS_gri.zip
(25MB) |
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| Original GSC
Geosoft gridded data format (.grd) |
M_grid.zip
(25MB) |
MS_grid.zip
(35MB) |
Syl_grid.zip
(1.5MB) |
Fran_grid.zip
(3.0MB) |
Note 1: The PDF maps were created from
MapPlace using the Rasterize print job option to
eliminate the black background. The TIF and PNG download images
include the geophysical information without topographic base
information.
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Legend:
K - potassium, i.e. K40 (units: %)
eU - equivalent uranium concentration by weight (the spectrometer
directly measures Bi214, that is an indirect measure of uranium) (units:
ppm)
eTh - equivalent thorium concentration by weight (the
spectrometer directly measures Tl208, that is an indirect measure of
thorium) (units: ppm)
Total Count - all counts from 400 to 3000 keV. (units: cps or uR/h)
Natural Exposure - computed from K (%), eU (ppm), eTh (ppm)
concentrations:
Exposure = 1.505 K + 0.625 eU + 0.31 eTh (uR/h)
(Grasty et al, 1984) 'Exposure' is different from the traditional 'Total
Count', in that it excludes radiation from man-made contaminants.
Natural Air Absorbed Dose Rate - computed from K (%), eU (ppm),
eTh (ppm) concentrations:
Absorbed Dose Rate = 13.08 K + 5.43 eU + 2.69 eTh (nGy/h) 'Natural Air
Absorbed Dose Rate' is different from the traditional 'Total Count', in
that it excludes radiation from man-made contaminants.
eU/eTh, eU/K, eTh/K - ratios of K, eU, eTh that are useful for
interpretation
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Units:
nT - unit of magnetic total field (nano Tesla)
ppm - unit of concentration by weight (part per million), used
for eU (uranium) and eTh (thorium)
% - for potassium (K40): unit of concentration by weight
Ur - unit of radioelement concentration by weight
(1 Ur is defined as the total count rate from 1 ppm uranium in
equilibrium)
µR/h - unit of Exposure (micro Roentgen/hour)
nGy/h - unit of Natural Air Absorbed Dose Rate (nano Gray/hour)
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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) 952-0454
Fax: (250) 952-0381
Website:
http://www.em.gov.bc.ca/geology/
* * * FINAL PRODUCT
RELEASE * * *
The
Geological Survey of Canada
has the Mount Milligan Survey
available as
GSC Open File 2535 and the Inzana-Salmon Lakes survey available as
GSC Open File 2801. The Mount Sylvester and
Fran Property multisensor geophysical survey data will be available in variety
of digital and printed formats in late spring of 2005:
1. Available from GSC offices in Vancouver & Ottawa on demand
 | 1:50 000 scale colour interval, hardcopy maps |
| 1:250 000 scale colour interval hardcopy maps |
2. Available from GSC Offices in Vancouver, Ottawa and Crown
Publications Ltd. in Victoria.
| Plot sized digital
images of colour interval maps on CD-ROM in Portable Document Format
(PDF). |
3. Available only from the Radiation Geophysics Section in Ottawa,
on demand .
| Customized geophysical survey digital data on
CD-ROM in a user-compatible format. |
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This page was last updated
September 12, 2007. |
