BCGS Open File 2011-06: Till Geochemistry of the Colleymount Map Area (093L/01), West-central British Columbia

T. Ferbey

The silt plus clay-sized fraction of 84 basal till samples collected within the Colleymount map area (093L/01), located approximately 40 km southeast of Houston, BC, was analyzed for 37 elements by inductively coupled plasma mass spectrometry (ICP-MS), following an aqua regia digestion, and 35 elements by instrumental neutron activation analysis (INAA). An additional 18 basal till samples were collected for analysis of heavy metal concentrates and gold grain counts. The spatial distribution of till samples elevated in Cu, Mo, Pb, Zn, Ag, Hg, Au, As, Sb, and visible gold grains are the focus of this study. Detrial dispersal of commodity metals and pathfinder elements from known sources of mineralization is discussed (e.g., past producing Equity Silver mine) as are areas of geochemical interest.

GeoFile 2011-07: Regional Geochemical Survey Database

Ray Lett

The British Columbia Geological Survey, Ministry of Energy andMines has been involved in reconnaissance-scale stream sediment and water surveys since 1976. This program has generated high-quality stream and lake sediment and surface water data from geochemical surveys carried out across Canada. In British Columbia the National Geochemical Reconnaissance (NGR) program, known as the Regional Geochemical Survey (RGS), has covered roughly 75 percent of the province with stream sediment and stream water sampling at an average sample density of one sample per 13 square kilometres. A MicrosoftTM Access database
contains all of the field and analytical information from 61,425 samples collected and/or reanalysed by the BC Geological Survey, the Geological Survey of Canada and Geoscience BC from 1976 to March 2011. The figure to the right shows the RGS sample coverage.

BCGS Open File 2011-04: East Hoodoo Mountain – Iskut River Geology (NTS 104B/14E, 11NE)

M.G. Mihalynuk, J.M. Logan and A. Zagorevski

Open File 2011-4 covers NTS map area 104B/14E and the northern part of 11E within the Iskut River area of northwestern British Columbia. This region is characterized by exceptional mineral endowment, as described by Mihalynuk et al. (2011, Geological Fieldwork 2010, Paper 2011-1): “… a 20km-wide corridor south of the Iskut River includes the Bronson Slope, Snip, Johnny Mountain, Eskay Creek and Rock and Roll deposits -all with past production or defined resources. These deposits formed in a surprisingly diverse set of environments ranging from intrusion hosted sulphide veins to shallow subaqueous hotspring settings. No deposits with past production or defined resources occur within a 20km corridor immediately north of the Iskut River, yet those farther afield include Galore Creek, Copper Canyon and Schaft Creek deposits that are hosted by alkalic and calc-alkalic porphyries. An obvious explanation for the dearth of deposits within the northern corridor is not forthcoming from existing geological maps; however, a significant part of the corridor has either never been systematically mapped or at least not since it was surveyed by Forrest Kerr in the 1920’s. A working partnership was established between the BC Ministry of Energy, Mines and Petroleum Resources, the Geological Survey of Canada (under the auspices of the Geoscience for Energy and Minerals Strategy: GEMS), Pacific North West Capital Corp., and the University of Victoria to address this lack of public geologic knowledge through systematic mapping. Supplementary goals were to provide a more accurate geological setting for the Rock and Roll deposit and to evaluate the potential for similar precious metal rich polymetallic massive sulfide mineralization within the Iskut and adjacent regions. Our work was mainly focused where published mapping was entirely lacking: the eastern half of the Hoodoo Mountain mapsheet (NTS 104/14E). This mapsheet is bordered to the north by the Galore Creek mapsheet (104G/3) and to the east by Forrest Kerr mapsheet (104B/15), both covered by relatively recent regional geological surveys (Logan and Koyanagi, 1994, 104G/3, 4; and Logan et al., 2000, 104B/10, 15, 104G2, 7W).”


Most provincial geoscience data can be easily accessed over the internet in map format at: and through various thematic pages at

Printed BC Geological Survey geoscience publications are available from Crown Publications Inc.

Tel: 250-387-6409 Fax: 250-387-1120

Email: Website:

Questions or to update your contact info please contact the BC Geological Survey:

Email: Tel: 250-952-0372 Fax: 250-952-0381

BC Geological Survey

British Columbia Ministry of Energy and Mines

Mines and Mineral Resources Division

Release Notification 2011-08

April 18, 2011