A total of 721 moss-trapped sediment samples plus water were acquired from 681 stream sites located in a 10,000 km2 survey area north of the communities of Campbell River and Zeballos, within NTS 1:250 000 map sheets 092L, 092K and 102I. Sample locations were selected to increase geochemical coverage and combined with historical survey work (see Geoscience BC Report 2013-12), the resulting average sample site density has been improved to one site every 5 km2.
Samples were processed at ALS Global Ltd. in North Vancouver, BC, where the stream sediment pulps were analyzed for base and precious metals, pathfinder elements and rare earth elements by aqua-regia digestion followed by combination of inductively-coupled plasma - mass spectrometry (ICP-MS) analysis for 53 elements. Control reference material and analytical duplicate samples were inserted in each block of twenty sediment and water samples. Splits of the processed sediment material were sent to ALS Global Ltd. and Becquerel Laboratories (Mississauga, ON) for analysis. Pulps were also analyzed by instrumental neutron activation analysis (INAA). Loss-on-ignition and fluorine were determined for the sediment material and fluoride, conductivity and pH were determined for the stream water samples. These analytical data plus field data have been provided in the Microsoft® Excel (XLS) files GBC Reports 2013-11A.XLS and -11B.XLS. PDF files include sample location maps and maps for individual metals.