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Ministry of Energy Mines and Responsible for Core Review

104J

 

NTS 104J - Dease Lake

BC RGS 55  / GSC OF 4011 / GBC 2012-2 / GBC R2012-7 / GBC 2013-03

The Dease Lake (NTS 104J) reconnaissance-scale stream sediment and water survey was completed in 2000 and the resulting field and analytical data were released in 2001. A total of 963 sediment and 946 water samples were collected from 908 sample sites at an average density of one site every 13 square kilometres. Survey results include 47 metals in stream sediments, fluorine and loss-on-ignition in sediments, and pH, uranium, fluoride and sulphate in stream waters. In addition, 213 stream water samples were analyzed for trace and major elements.  Sediment samples were analyzed for base metals, precious metals, pathfinders and rare earth elements by aqua-regia inductively coupled plasma-mass spectroscopy (ICP-MS) and instrumental neutron activation analysis (INAA).

 

The map sheet covers a relatively under-explored frontier area with a strong mineral exploration community based on placer activities, and nearby mines such as Golden Bear (MINFILE 104K 079).

 

The potential for further mineral discoveries includes porphyry Cu-Mo-Au, volcanogenic massive sulphides (VMS), Au (vein and intrusion related) and platinum group elements (PGE) occurrences.  See Dease Lake RGS Anomalies.

 

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 2012-7 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). 

 

Geoscience BC Report 2013-3 presents the results of the QUEST-Northwest Block 3 airborne magnetic survey, located near the community of Iskut, BC. Geo Data Solutions Inc. flew the survey during July and August of 2012. The survey was flown at a line spacing of 250 m, and the total survey coverage is 5746 line-km.

 

The report also includes 2200 line-km of airborne magnetic data purchased from New Chris Minerals Ltd. This dataset was collected in late 2011 and early 2012 at a 100 m line-spacing, and lies in the center of the QUEST-Northwest Block 3 area.

ICP-MS
Sediments
Element Detection Limit Units
Aluminum 0.01 %
Antimony 0.02 ppm
Arsenic 0.1 ppm
Barium 0.5 ppm
Bismuth 0.02 ppm
Boron 20 ppm
Cadmium 0.01 ppm
Calcium 0.01 %
Chromium 0.5 ppm
Cobalt 0.1 ppm
Copper 0.01 ppm
Gallium 0.2 ppm
Gold 0.2 ppb
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
Silver 2 ppb
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
Beryllium 0.1 ppm
Cerium 0.1 ppm
Cesium 0.02 ppm
Germanium 0.1 ppm
Hafnium 0.02 ppm
Indium 0.02 ppm
Lithium 0.1 ppm
Niobium 0.02 ppm
Rubidium 0.1 ppm
Rhenium 1 ppb
Tin 0.1 ppm
Tantalum 0.05 ppm
Yttrium 0.01 ppm
Zirconium 0.1 ppm
Platinum 2 ppb
Palladium 10 ppb
INAA plus F and LOI
Sediments 
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
Iron 0.2 % INAA
Iridium 50 ppb 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
Fluorine 10 ppm ION
Loss on Ignition 0.1 % GRAV
Waters
pH     GCE
Uranium 0.05 ppb LIF
Fluoride 20 ppb ION
Sulphate 1 ppm TURB

 

Trace and Major Elements
Waters
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

 

Acknowledgements

In collaboration with the Geological Survey of Canada, the Dease Lake survey was designed and managed by the B.C. Geological Survey Branch. The survey was funded by the Targeted Geoscience Initiative (TGI) and the British Columbia Ministry of Energy and Mines.

 

P.W.B. Friske and W. Jackaman directed the survey and coordinated the activities of the various contractors, B.C. Geological Survey Branch (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:

 

COLLECTION:

McElhanney Consulting Services Ltd., Vancouver, B.C.
W. Jackaman (BCGS)

PREPARATION:

Bondar Clegg, North Vancouver, B.C.
R.E.W. Lett (BCGS) and P.W.B. Friske (GSC)

ANALYSIS:

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

Becquerel Laboratories, Ltd., Mississauga, Ontario
P.W.B. Friske (GSC)

CanTech Laboratories, Inc., Calgary, Alberta
P.W.B. Friske (GSC) and R.E.W. Lett (BCGS)

G.S.C. Analytical Method Development, Ottawa, Ontario
G.E.M. Hall (GSC) and J.E. Vaive (GSC

 

Dease Lake RGS Anomalies

RGS Anomalies Identified West of Dease Lake

New government regional geochemical survey (RGS) data for the previously unsampled Dease Lake map sheet (104J) was released on July 5th, 2001. Stream sediment  samples were analysed for more than 40 elements, including precious and base metals. The survey results include anomalies characteristic of polymetallic volcanogenic massive sulphide, copper-gold porphyry, and intrusive-related gold deposits in areas with no known mineral occurrences. As well, a multi-element anomaly with high tantalum values occurs in an area that has been generally discounted for its mineral values.

 

New Volcanogenic Massive Sulphide Targets?

A broad zone of coincident zinc, copper and barium anomalies with associated silver, antimony, selenium and cadmium values extends from Killarney Lake to north of Nuthinaw Mountain. Many of the zinc values exceed 145 ppm, and are higher than the 90th percentile for RGS silt samples in the province. These anomalies are found in streams draining rocks of the Cache Creek Terrane, particularly in areas with the mid-Permian French Range Formation. This Formation consists primarily of basaltic volcanic rocks with associated argillite, chert, felsic volcanics and bright red ferruginous cherts.

 

The French Range Formation volcanic rocks may be relicts of the same intraoceanic arc which gave rise to the Kutcho Creek massive sulphide deposit (Mihalynuk and Cordey, 1997).

 

Copper Gold Porphyry Potential

There are a number of copper-gold anomalies underlain by rocks of the Stikine Terrane in the southern half of the Dease Lake map area with no associated mineral occurrences. They  appear to be related to Triassic granodiorite intrusions and are prime exploration targets for new porphyry deposits given the well known potential of this part of the Cordillera.  There are individual and grouped copper-gold anomalies in the Shesley region and Hotailuh Range.

 

References

Gabrielse, H. (1994): Geology of the Cry Lake (104I) and Dease Lake (104J/E) map areas, north central British Columbia. Geological Survey of Canada, Open File 2779.

Mihalynuk, M. G. and Cordey, F. (1997): Potential for Kutcho Creek volcanogenic massive sulphide mineralization in the northern Cache Creek Terrane: a progress report. B.C. Ministry of Energy and Mines, Geological Fieldwork 1996, pages 157-170.