Ongoing efforts by government-funded agencies to update and maintain the geochemical database established by the British Columbia Regional Geochemical Survey (RGS) and the National Geochemical Reconnaissance programs have produced one of the most comprehensive collections of field information and multi-element analytical data in Canada (Jackaman, 2011; Jackaman and Lett, 2013). The database has benefitted from a series of large-scale reanalysis initiatives that have been sponsored by Geoscience BC since 2007. Recognized as a cost-effective means of updating information collected during older government funded regional geochemical surveys, these programs have significantly improved the BC geochemical database by providing a wide range of new analytical information at improved detection levels plus greater data compatibility with analytical methods currently being employed.
Geoscience BC Report 2013-09 presents ICP-MS results for stream sediment samples collected during the original 1977 Nelson RGS program. Results from the 1977 Lardeau RGS program were released in January 2013 as Geoscience BC Report 2013-04.
The Nelson regional geochemical survey was conducted in 1977 and included the collection of 1394 stream sediment samples. In co-operation with the BC Geological Survey (BCGS) and Natural Resources Canada (NRCan), samples saved from the survey work were retrieved from storage facilities in Ottawa. A total of 1554 drainage-sediment and quality-control samples were subsequently delivered to Acme Analytical Laboratories Ltd. (Vancouver, BC) and analyzed by an ultra-trace aqua-regia digestion (0.5 g) ICP-MS technique for 53 elements
ICP-MS results have been provided in the Microsoft® Excel (XLS) file GBC REPORT 2013-09.XLS. The data have been carefully checked for analytical quality using blind duplicate samples and control reference material. Reanalysis data determined to be complete and accurate were merged with sample site location information acquired from the original survey publication. Routine comparison of the original determinations with the ICP-MS analyses for elements such as copper, lead, nickel and zinc, identified inconsistencies in some samples. As a result, ICP-MS data for 382 samples have been removed from the data set until further investigations can be completed.