Till Geochemistry of Tahtsa Lake District North and Adjacent Areas, West-Central British Columbia -- A Key Ingredient for the Discovery of New Porphyry, VMS, and Polymetallic Vein Mineralization (NTS 93E, 93L)
- Travis Ferbey, BC Geological Survey

Project LocationA two-year, Quaternary geology and till geochemistry program is being undertaken for the northern portion of the Tahtsa Lake district, and adjacent areas (NTS 93E/15, 16, and 93L/1, 2). This area has been chosen as it: 1) has high potential to host porphyry copper, molybdenum, and gold-style mineralization (e.g. Huckleberry Mine, Berg and Lucky Ship developed prospects), epithermal and perhaps VMS-style mineralization, and polymetallic veins (e.g. past producers Equity Silver and Emerald Glacier); 2) is an area where mineral exploration is hindered by an extensive till cover and relatively little bedrock out crop; and 3) is adjacent to Huckleberry Mine where there is a clear relationship between Cu, Mo, Au, Ag, and Zn in till geochemical data and the locations of ore zones and polymetallic veins on the mine property. There presently are large areas of unstaked ground within the study area and to assess the mineral potential of it, Quaternary mapping and till sampling will take place in two mapsheets per year, with resultant Quaternary geology maps and till geochemical data being released annually.

This project, located within Geoscience BC's QUEST-West study area, will provide to the mineral exploration community new, high-quality, regional-scale, geochemical data that will help guide exploration efforts in an area with high mineral potential and an extensive cover of glacial drift. Integrating interpretations of these data with other geochemical and geophysical data being collected by Geoscience BC in the QUEST-West study area, and historic data that have been collected by the British Columbia Geological Survey and the Geological Survey of Canada, will provide a powerful tool for mineral exploration companies working here. These geochemical data will generate new mineral exploration activity, and resultant economic opportunities, in an area adversely affected by the mountain pine beetle infestation.

Posters and Presentations
2011: Assessing the Mineral Potential of Drift Covered Area, West-Central British Columbia: Year 2 - Colleymount Map Area (NTS 93L/1)
- Mineral Exploration Roundup Poster (pdf, 7.4 MB)

2010: Assessing the Mineral Potential of Drift Covered Areas, Tahtsa Lake District, West-Central British Columbia - Year 1
- Mineral Exploration Roundup Poster (pdf, 1.36MB)
Technical Articles
2011: "Quaternary geology and till geochemistry of the Colleymount map area, west-central British Columbia"
- Summary of Activities 2010, Report 2011-1 p. 65-72 (pdf, 5.0 MB)

2010: "Quaternary geology and till geochemistry of the Nadina River map area (NTS 093E/15), west-central British Columbia"
- Summary of Activities 2009, Report 2010-1 p.42-48 (pdf, 3.7 MB)
Final Deliverables
Geoscience BC Report 2010-10 / BCGS Open File 2010-07
Till Geochemistry of the Nadina River Map Area (093E/15), West-Central British Columbia

The silt plus clay-sized fraction of 79 basal till samples collected within the Nadina River map area (093E/15), located approximately 100 km southwest 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 16 basal till samples were collected for analysis of heavy metal concentrates and gold grain counts. The spatial distribution of samples elevated in Cu, Mo, Pb, Zn, Ag, Ni, Hg, Au, As, Sb, Cr, and visible gold grains are the focus of this study. Data presented here highlight four areas of geochemical interest. Follow-up field work is required to assess the significance of the elevated element values used to identify these areas.


Geoscience BC Report 2011-9 / BCGS Open File 2011-06
Till geochemistry of the Colleymount map area (093L/01), west-central British Columbia

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. Detrital 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.


Geoscience BC Report 2014-09 / BCGS Geoscience Maps 2014-01 and -02
Surficial geology of the Nadina River and Colleymount map areas (NTS 093E/15 and 093L/01), British Columbia

The Nadina River and Colleymount map areas are in the Nechako Plateau, a subdivision of the Interior Plateau with flat to gently rolling topography. The area has an extensive drift cover and sparse bedrock outcrop. These maps are an ancillary product of earlier work devoted to till geochemistry (GBC Reports 2010-10 and 2011-09, or BCGS Open Files 2010-07 and 2011-06), and are based on air photo interpretation and widely spaced ground observations.
 


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