Geoscience BC Report 2008-11

Regional Stream Sediment and Water Geochemical Data: Terrace & Prince Rupert (NTS 103I & 103J), British Columbia
by W. Jackaman

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Report Description
The reanalysis of archived stream sediment samples by inductively coupled plasma mass spectrometry (ICP-MS) is accepted as a cost-effective means of obtaining new and improved regional geochemical information. This technique provides a significant upgrade from the atomic absorption spectroscopy (AAS) method routinely used for federal and provincial government-funded reconnaissance-scale drainage sediment surveys conducted before 1999. The use of ICP-MS not only provides a wide range of new analytical information at improved detection levels but also offers greater data compatibility with laboratory methods currently being employed.

Recognizing the advantages associated with this type of initiative, Geoscience BC in partnership with the Terrace Economic Development Authority, the Regional District of Kitimat-Stikine through the Northern Development Initiative Trust and the KT Industrial Development Society provided funding for the recovery and analyses of stream sediment pulps from a 1978 geochemical survey conducted in the Terrace and Prince Rupert areas.

Geoscience BC Report 2008-11 includes results from the original 1978 survey, instrumental neutron activation analysis (INAA) data released in 1995, and the new ICP-MS data. The 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 and DBF formats.

The resulting geochemical data compilation will provide the mining and exploration community with over 90 elements in stream sediments for each of the 2128 sample sites at an average density of one site every 8 km2. In addition, the work will complement other geoscience research and data mining activities as well as ongoing efforts to develop a comprehensive collection of geochemical information for the province. Currently, the provincial database includes analytical information for approximately 65 000 sample sites and covers over 70% of BC1.

1Lett, R.E.W. (2005): Regional geochemical survey database on CD; BC Ministry of Energy, Mines and Petroleum Resources, Geofile 2005-17, CD-ROM.

Suggested Reference
Jackaman, W. (2008): Regional stream sediment and water geochemical data: Terrace & Prince Rupert (NTS 103I & 103J), British Columbia; Geoscience BC, Report 2008-11, p.

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