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Ministry of Energy Mines and Responsible for Core Review



NTS 104A & H - Bowser Lake & Spatsizi River


Northwestern BC Regional Geochemical Survey / RGS 58 / GSC OF 5000 / GBC 2012-2 / GBC 2012-3 / GBC 2012-7

The Northwestern BC (NTS 104A/H) reconnaissance-scale stream sediment and water survey was completed in 2004 and the resulting field and analytical data were released in 2005. Stream sediment and water samples were collected in the Bowser Lake and Spatsizi River areas of northwestern British Columbia, a region north of Terrrace and southeast of Dease Lake. These samples have been analysed for their trace metal and other element content. The surveys cover over 18,500 square kilometers of the contiguous Bowser Lake (104A) and Spatsizi River (104H) map sheets, where, in addition to five past-producing copper-gold-lead mines and over 160 other mineral prospects, the Red Chris porphyry copper-gold deposit is at an advanced exploration stage. The world class Eskay Creek gold mine is immediately west of the surveyed area. Hazelton Group volcanic-sedimentary rocks hosting these deposits area are highly prospective for volcanogenic massive sulphide, epithermal gold-silver vein and copper-molybdenum porphyry mineralization. The Bowser Lake sedimentary rocks that underlie the eastern part of the survey area may have the potential for sedimentary-exhalative lead-zinc mineralization.


A total of 1463 stream sediment and 1458 water samples were collected from 1385 sites covering over 18,500 square kilometers at a density of one sample per 13.5 square kilometers. Sediment samples were analysed for Ag, Al, As, Au, Bi, Ba, Br, Ca, Cd, Ce, Co, Cr, Cu, Eu, Fe, Ga, Hf, Hg, K, La, Loss-on-ignition, Lu, Mg, Mn, Mo, Na, Ni, P, Pb, Rb, S, Sb, Sc, Se, Sm, Sr, Ta, Tb, Te, Th, Ti, Tl, U, V, W, Yb and Zn. Water samples were analysed for pH, conductivity, Cl, F, NO3, SO4 and U. Filtered, acidified water samples from 320 of the sites were also analysed for 52 major and trace elements.


Geoscience BC Report 2012-2 presents the results of the QUEST-Northwest Block 1 airborne magnetic survey, located between the communities of Dease Lake and Iskut.  This dataset was collected by Aeroquest Airborne over the summer and fall of 2011.  The survey was flown with a line spacing of 250 m., and the total survey coverage is 27,012 line-km. 


Geoscience BC Report 2012-3 presents the results of the QUEST-Northwest Block 2 airborne magnetic survey, located near the community of Telegraph Creek.  This dataset was collected by Geo Data Solutions Inc. over the summer and fall of 2011.  The survey was flown with a line spacing of 250 m, and the total survey coverage is 11,345 line-km.


Geoscience BC Report 2012-7 reports on new infill stream based geochemical surveys plus the reanalysis of over 2400 sample pulps from government funded surveys that were originally completed in NTS map sheets 104F, G and K during the mid-1980s. Geoscience BC Report 2012-7 includes results of the 2011 infill sampling programs. Data generated by the reanalysis work was released in April 2012 (GBC Reports 2011-5 and 2011-6).




Analytical Data
Element Detection Limit Units
Gold 0.2 ppb
Silver 2 ppb
Aluminum 0.01 %
Antimony 0.02 ppm
Arsenic 0.1 ppm
Barium 0.5 ppm
Boron 20 ppm
Bismuth 0.02 ppm
Cadmium 0.01 ppm
Calcium 0.01 %
Chromium 0.5 ppm
Cobalt 0.1 ppm
Copper 0.01 ppm
Gallium 0.1 ppm
Iron 0.01 %
Lanthanum 0.5 ppm
Lead 0.01 ppm
Magnesium 0.01 %
Manganese 1 ppm
Mercury 5 ppb
Molybdenum 0.01 ppm
Nickel 0.1 ppm
Phosphorus 0.001 %
Potassium 0.01 %
Scandium 0.1 ppm
Selenium 0.1 ppm
Sodium 0.001 %
Strontium 0.5 ppm
Sulphur 0.02 %
Tellurium 0.02 ppm
Thallium 0.02 ppm
Thorium 0.1 ppm
Titanium 0.001 %
Tungsten 0.05 ppm
Uranium 0.05 ppm
Vanadium 2 ppm
Zinc 0.1 ppm
Beryllum 0.1
Cerium 0.1
Cesium 0.02
Germanium 0.1
Hafnium 0.02
Indium 0.02
Lithium 0.1
Niobium 0.02
Rubidium 0.1
Rhenium 1
Tin 0.1
Tantalum 0.05
Yttrium 0.01
Zirconium 0.1
Platinum 2
Palladium 10
Element Detection Limit Units  Methods
Antimony 0.1 ppm INAA
Arsenic 0.5 ppm INAA
Barium 50 ppm INAA
Bromine 0.5 ppm INAA
Cadmium 5 ppm INAA
Cerium 5 ppm INAA
Cesium 0.5 ppm INAA
Chromium 20 ppm INAA
Cobalt 5 ppm INAA
Europium 1 ppm INAA
Gold 2 ppb INAA
Hafnium 1 ppm INAA
Iridium 50 ppb INAA
Iron 0.2 % INAA
Lanthanum 2 ppm INAA
Lutetium 0.2 ppm INAA
Molybdenum 1 ppm INAA
Nickel 10 ppm INAA
Rubidium 5 ppm INAA
Samarium 0.1 ppm INAA
Scandium 0.2 ppm INAA
Selenium 5 ppm INAA
Silver 2 ppm INAA
Sodium 1 % INAA
Tantalum 0.5 ppm INAA
Tellurium 10 ppm INAA
Terbium 0.5 ppm INAA
Thorium 0.2 ppm INAA
Tin 100 ppm INAA
Titanium 100 ppm INAA
Tungsten 1 ppm INAA
Uranium 0.2 ppm INAA
Ytterbium 2 ppm INAA
Zinc 100 ppm INAA
Zirconium 200 ppm INAA
Sample Weight 0.01 g GRAV
Loss on Ignition 1 % GRAV
pH 0.1    ISE
Conductivity 1 uS ISE
Uranium 0.005 ppb ICP-MS
Fluoride 50 ppb ION
Sulphate 50 ppb ION
Chloride 100 ppb ION
Nitrate 50 ppb ION
Trace and Major Elements
Element Detection Limit Units  Methods
Aluminium 2 ppb ICPMS
Antimony 0.01 ppb ICPMS
Arsenic 0.1 ppb ICPMS
Barium 0.2 ppb ICPMS
Beryllium 0.005 ppb ICPMS
Boron 0.5 ppb ICPMS
Cerium 0.01 ppb ICPMS
Cesium 0.01 ppb ICPMS
Chromium 0.1 ppb ICPMS
Cobalt 0.05 ppb ICPMS
Copper 0.1 ppb ICPMS
Dysprosium 0.005 ppb ICPMS
Erbium 0.005 ppb ICPMS
Gadolinium 0.005 ppb ICPMS
Lanthanum 0.01 ppb ICPMS
Lead 0.01 ppb ICPMS
Lithium 0.005 ppb ICPMS
Manganese 0.1 ppb ICPMS
Molybdenum 0.05 ppb ICPMS
Neodymium 0.005 ppb ICPMS
Nickel 0.2 ppb ICPMS
Praseodymium 0.005 ppb ICPMS
Rubidium 0.05 ppb ICPMS
Samarium 0.005 ppb ICPMS
Strontium 0.5 ppb ICPMS
Titanium 0.5 ppb ICPMS
Uranium 0.005 ppb ICPMS
Vanadium 0.1 ppb ICPMS
Ytterbium 0.005 ppb ICPMS
Yttrium 0.01 ppb ICPMS
Zinc 0.5 ppb ICPMS
Calcium 0.02 ppm ICPES
Iron 0.005 ppm ICPES
Magnesium 0.005 ppm ICPES
Potassium 0.05 ppm ICPES
Silicon 0.02 ppm ICPES
Sodium 0.05 ppm ICPES
Sulphur 0.05 ppm ICPES


The Bowser Lake survey was funded by the BC Ministry of Energy, Mines and Petroleum Resources with support from the Geological Survey of Canada under the Targeted Geoscience Initiative. The BC & Yukon Chamber of Mines Rocks to Riches program funded the Spatsizi River portion of the survey.


P.W.B. Friske and R.E.W. Lett directed the survey and coordinated the activities of the various contractors, BC Geological Survey (BCGS) staff and Geological Survey of Canada (GSC) staff. Contracts were awarded to the following companies for sample collection, preparation, and analysis, and were managed by the listed BCGS and GSC staff:



McElhanney Consulting Services Ltd., Vancouver, BC
W. Jackaman, P.W.B. Friske (GSC) and R.E.W. Lett (BCGS)


ACME Analytical Laboratories, Ltd., Vancouver, BC
R.E.W. Lett (BCGS) and P.W.B. Friske (GSC)


ACME Analytical Laboratories, Ltd., Vancouver, BC
R.E.W. Lett (BCGS) and P.W.B. Friske (GSC)

Becquerel Laboratories, Ltd., Mississauga, Ontario
P.W.B. Friske (GSC) and R.E.W. Lett (BCGS)

GSC Analytical Method Development, Ottawa, Ontario
P.W.B. Friske (GSC) and G.E.M. Hall (GSC)

GSC Chaemistry and Analytical Services, Ottawa, Ontario
P.W.B. Friske (GSC) and R. Boisvert (GSC)