Regional Drainage Sediment and Water Geochemical Data - Anahim Lake and Nechako River, Central British Columbia (NTS 93C, 93F)
- Wayne Jackaman, Independent Consultant

The Anahim Lake (NTS 93C) and Nechako River (NTS 93F) surveys provide new geochemical data covering a number of highly prospective unsurveyed areas within the region.

Nechako and Anahim Survey Area The survey reports analytical data for base and precious metals, pathfinders and rare earth elements for over 1,950 sites located in the 20,000 square kilometre survey areas. This information compliments the existing geoscience database and will also contribute to ongoing efforts to complete initial geochemical coverage of the entire province. These map sheet areas were selected because they have potential for the discovery of porphyry-related precious and base metal mineralization as well as precious metal epithermal and intrusion-related copper-gold and molybdenum deposits.

While stream sediments are most commonly used for regional geochemical surveys in BC, the subdued topography, poor drainage and abundance of lakes in the northern Interior Plateau region of central BC make lake sediments an appropriate geochemical sample medium in this area. Lake sediment surveys are an effective tool to delineate regional geochemical patterns and anomalous metal concentrations related to mineral deposits. The discovery of epithermal precious metal prospects such as the Wolf, Capoose and Tsacha prospects, and porphyry base metal prospects such as the Mac deposit, are examples of the successful application of lake sediment geochemistry in this area.

Survey results provide the exploration community access to new geochemical information for under-explored areas of high mineral potential and will stimulate future exploration activities. The survey results were relased in July 2006 and within three months 193,000 hectares were staked.

Posters and Presentations
2006 : Drainage Sediment & Water Geochemical Surveys: Anahim Lake & Nechako River Map Areas (NTS 93C & F)
- Mineral Exploration Roundup Poster (pdf, 6.12MB)

Technical Articles
2006 : "Drainage Sediment and Water Geochemical Surveys in the Anahim Lake and Nechako River Map Areas (NTS 093C and F), Central British Columbia"
- Geological Fieldwork 2005, Paper 2006-1 p.295-301 (pdf, 6.32MB)

Final Deliverables
Geoscience BC Report 2006-4
Regional Drainage Sediment and Water Geochemical Survey Data, Anahim Lake - Nechako River, Central British Columbia (NTS Map Sheets 093C and 093F)

This digital release reports new regional geochemical drainage sediment - water survey data from the Anahim Lake (NTS 93C) and Nechako River (93F) map sheets. It consists of a survey summary, data listings, statistics and maps in PDF format, plus appendices containing raw data and GIS importable shapefiles.

There are over 60 base and precious metal occurrences in the Anahim Lake - Nechako River map sheets including several such as the 3T's and Clisbako, which have extensive exploration history. However, exploration for new deposits has been hampered by widespread glacial sediment and Miocene lava cover. During 2005 a total of 2070 drainage sediment and water samples were collected from 1957 sites covering 19 500 square kilometres. Most of the samples were taken from lakes and analysed for trace and minor elements by instrumental neutron activation and by aqua regia digestion - inductively coupled plasma mass spectrometry (ICP/MS), for loss on ignition (LOI) and for fluorine. Water samples were analysed for pH, conductivity and fluoride. Survey data has been combined with the results of two previous lake sediment and water geochemical surveys completed near the Fawnie Range and around Ootsa Lake. Gold values up to 694 ppb and copper up to 1536 ppm have been detected in sediment samples.

 



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