PROVINCE of BRITISH COLUMBIA
MINISTRY of ENERGY, MINES & PETROLEUM
RESOURCES
Geological Survey Geofile 2005_18: Digital Data Files
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British Columbia Till Geochemical Surveys
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File: README.DOC
Date: December 2005
Digital files 2005_18_96 and 2005_18_97_98 contain all sample location information,
and analytical data collected from 1996 to 1998 as part of a multi-year till geochemical
survey over the Adams Plateau area of Central British Columbia. Geofile 2005-18 is a
overview of the techniques used to collect and analyse the samples, the regional ice-flow
history and maps showing the distribution of Iron (Fe2O3), Calcium (CaO), Titanium
(TiO2) chromium (Cr2O3), Arsenic (As), Gold (Au), Nickel (Ni) and Copper (Cu) in the
till samples. The digital files have the raw geochemical data from which the maps were
created plus additional elements. The following headings are common to each file.
SAMPLE:
MAP:
UTM_ZN:
UTM_E:
UTM_N:
Laboratory sample number
1:50 000 NTS Map Sheet Number
NTS UTM Zone
UTM Easting, NAD 27
UTM Northing, NAD 27
QC:
Quality Control; R = Routine Sample; DUP 1 = Field Duplicate 1, DUP 2
Field Duplicate 2.
Sample Type; M1 = Regional basal till; M2 = Regional Ablation Till; M3
= Granite based basal till; M4 = Granite based ablation till. CM1 and CM2
= Colluviated till.
MAT:
SITE:
Location at which the sample was collected. Site descriptions are listed in
the individual Open Files referenced in Geofile 2005_18
_ICP:
= Aqua regia digestion followed by Inductively Coupled plasma emission
spectrometry (1996 results)
_ ICM:
= Aqua regia digestion followed by ultrasonic nebulizer- inductively
coupled plasma emission spectrometry (1997 & 1998 results)
_NA:
= Instrumental neutron activation analysis
_LI:
= Lithium metaborate fusion followed by Inductively Coupled plasma
emission spectrometry
_GRAV:
= Loss on ignition at 550OC
C_TOT:
= Leco combustion analysis for C
S_TOT:
= Leco combustion analysis for S
SUM:
= Sum of oxides
The data is in two files because more sensitive ultrasonic nebulizer- inductively coupled
plasma emission spectrometry was used the determine trace elements after aqua regia
digestion in 1997 and 1998. Consequently, there are differences in the suite of elements
measured in 1996 and their detection limits compared in 1997 and 1998. Elements
determined by instrumental neutron activation and lithium metaborate fusion- inductively
Coupled plasma emission spectrometry have similar detection limits in all years and can
therefore be combined into a seamless file. Considerable effort has been taken to ensure
that the data files are free of error. Please, contact the British Columbia Geological
Survey in Victoria if any discrepancies arise.
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