June 23, 2006
Regional Drainage Sediment and Water Geochemical Data, Anahim Lake and Nechako River, British Columbia

 Regional Drainage Sediment and Water Geochemical Data, Anahim Lake and Nechako River, British Columbia
(NTS Map Sheets 93C and F)

By W.Jackman

Geoscience BC Report 2006-4 / MEMPR Geofile 2006-11 reports new regional geochemical drainage sediment -- water survey data from the Anahim Lake (NTS 93C) and Nechako River (93F) map sheets. This digital release consists of a survey summary, data listings, statistics and maps in PDF format, plus appendices containing raw data and GIS importable shape files.

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.

Regional Geochemical Survey of SouthEastern British Columbia
(NTS Map Sheets 83C, D, E and 82N)

By C.O. Nass

Geoscience BC Report 2006-5/ MEMPR Geofile 2006-12 reports results of regional geochemical drainage sediment -- water surveys in the Golden (NTS 82N), Brazeau River (83C), Canoe River (83D) and Mount Robson (83E) map sheets. This digital release consists of reports in PDF format, and appendices in a ZIP format file.

Most of the known base and precious metal occurrences are in the Golden map sheet although much of the remaining survey area has a higher potential for metallic and industrial mineral deposits. During 2005 stream sediment and water samples were collected from 1409 sites covering 21 560 square kilometres in southeastern BC. The samples were 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. Gold values up to 357 ppb and silver up to 1747 ppb were detected in sediment samples from the surveys.
 
 

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