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Ministry of Energy Mines and Responsible for Core Review



NTS 92I - Ashcroft

8/40 / GSC OF 866/2666 / GBC 2010-4 / GBC 2010-13

The Ashcroft (NTS 92I) reconnaissance-scale stream sediment and water survey was completed in 1981 and the resulting field and analytical data were released in 1982. A total of 606 sediment and 596 water samples were collected from 572 sample sites.


As part of the RGS Archive Program, 594 archived sediment pulps were re-analyzed by epi-thermal INAA and this new data along with original survey results were re-published in 1994.


In 2010, under the QUEST-South Project, Geoscience BC released new analytical results for a total of 8256 stream sediment samples under Geoscience BC Report 2010-4 that cover parts of NTS map sheets 082E, L, M and 092H, I, J, O, P.  These government-funded surveys were originally conducted from 1976 to 1981 as part of the National Geochemical Reconnaissance (NGR) program (Lett, 2005).  The new data has been carefully checked for analytical quality using blind duplicate samples and control reference material. 


Geoscience BC Report 2010-13, contains results of the 2009 infill surveys and parts of this package incorporate data from previous regional stream and lake based surveys completed in the study area as well as the new reanalysis results. This information has been provided in a variety of digital formats. PDF files include survey descriptions and details regarding methods, field and analytical data listings, summary statistics, sample location map, geology map and maps for individual metals. Raw digital data files used in the production process are included in XLS formats.

Original Analytical Data
Sediments Sediments
element method detection limit element method detection limit
Zinc AAS 2 ppm Tungsten COLOR 2 ppm
Copper AAS 2 ppm Iron AAS 0.02%
Lead AAS 2 ppm Molybdenum AAS 1 ppm
Nickel AAS 2 ppm Uranium NADNC 0.5 ppm
Cobalt AAS 2 ppm
Silver AAS 0.2 ppm Waters
Manganese AAS 5 ppm element method detection limit
Arsenic AAS-H 0.5 ppm pH GCE 0.1
Antimony AAS 0.2 ppm Uranium LIF 0.05 ppb
Mercury AAS-F 10 ppb Fluoride ION 20 ppb
INAA Data 
element detection limit element detection limit element detection limit
Gold 2 ppb Hafnium 1 ppm Sodium 0.10%
Antimony 0.1 ppm Iron 0.20% Tantalum 0.5 ppm
Arsenic 0.5 ppm Lanthanum 5 ppm Terbium 0.5 ppm
Barium 100 ppm Lutetium 0.2 ppm Thorium 0.5 ppm
Bromine 0.5 ppm Molybdenum 1 ppm Tungsten 2 ppm
Cerium 10 ppm Nickel 10 ppm Uranium 0.2 ppm
Cesium 0.5 ppm Rubidium 5 ppm Ytterbium 2 ppm
Chromium 5 ppm Samarium 0.5 ppm Zirconium 200 ppm
Cobalt 5 ppm Scandium 0.5 ppm  


The 1981 survey was managed and funded by the British Columbia Ministry of Energy, Mines and Petroleum Resources (MEMPR) as part of the Regional Geochemical Survey Program.  Data management was provided by the Geological Survey of Canada (GSC). 


Contracts were let to the following companies for sample collection, preparation and analysis and were managed by staff of the MEMPR.


COLLECTION: Rooi Enterprises Ltd., Victoria, B.C.
W.J. McMillan and W.M. Johnson (MEMPR)
REPARATION: Kamloops Research Assay and Laboratory, Kamloops, B.C.
W.M. Johnson (MEMPR)

Chemex Laboratories Ltd., North Vancouver, B.C. (Sediments)
Novatrack Analysts Ltd., Vancouver, B.C. (U in Sediments)
Bondar Clegg Ltd., North Vancouver, B.C. (Waters)
W.M. Johnson (MEMPR)

Initiated in 1990, the RGS Archive Program was conducted by the MEMPR and was funded in part by the Canada/British Columbia Mineral Development Agreement (1985-1990). P.F. Matysek and W. Jackaman directed the activities of MEMPR staff and managed the following sample preparation and analytical contracts.


PREPARATION:  Rob Phillips, Ottawa, Ont.
ANALYSIS: Becquerel Laboratories, Mississauga, Ont.