Survey Metadata

Till, Indicator minerals



Till sampling, NTS 42E, 52H, Beardmore-Geraldton area, northern Ontario, 1986-1989.

Location map

(requires an Internet connection)

Survey Description

A total of 900 till samples were collected in the Beardmore-Geraldton area, northern Ontario in 1986-1989.  505 were collected from surface excavations and 395 from rotasonic drill core.  Samples of glaciofluvial sediments were also collected at 87 sites.  The data are published in GSC Open File 2266 and GSC Memoir 435.

Data Description:

Paper report or digital report; data files on diskette (OF 2266). Paper report (Memoir 435).

Quantities Analysed:

<0.063 and <0.002 mm fractions by ICP-AES after nitric/aqua regia digestion for 25 elements;  <0.063 mm fraction by fire assay-AFS methods for Au, Pd, Pt (OF 2266).  <0.063 mm and <0.002 mm fractions by ICP-AES after nitric-aqua regia digestion for 32 elements (Memoir 435).

Geochem Maps Available:

Proportional dot maps showing the regional dispersal of elements, gold grain, and selected heavy mineral components (OF 2266).  Proportional symbol maps showing the dispersal of Au, As, Cu, and Ba in <0.063 mm fraction of till (Memoir 435).

Other Analyses:

Pebble lithologies (2-5.6 mm); total carbonate (Chittick) and concentration of heavy minerals for the following: gold grain counts, heavy mineral point counts, ICP-AES after a total extraction and fire assay/AFS for precious metals; SEM and geochemical analysis of selected gold and other heavy mineral grains (OF 2266).  Grain-size (<2 mm); carbonate (<0.063 mm (Chittick)); pebble lithologies (5.6-16 mm fraction); heavy mineral concentrate for gold grain counts, non-magnetic heavy minerals for INAA analysis and kimberlite indicator minerals (0.25-2.0 mm fraction) and point counts (0.063-0.25 mm); selected kimberlite indicator minerals analyzed with SEM and microprobe and selected gold grains for microprobe analysis; (Memoir 435).

Publication History

Index Publication
1 Thorleifson, L.H., Kristjansson, F.J. (1988). Stratigraphy and visible gold content of till in the Beardmore - Geraldton area, northern Ontario. Current Research Part C Canadian Shield, Geological Survey of Canada, Paper 88-01C, p. 217-221. (more)
2 Thorleifson, L.H., Kristjansson, F.J. (1988). Visible gold content and lithology of till from overburden drill holes, Beardmore - Geraldton area, District Of Thunder Bay, northern Ontario. Geological Survey of Canada, Open File 1756. (more)
3 Thorleifson, L.H., Kristjansson, F.J. (1990). Geochemical, mineralogical, lithological analyses of glacial sediments for gold, base metal and kimberlite exploration, Beardmore-Geraldton area, District of Thunder Bay, northern Ontario. Geological Survey of Canada, Open File 2266. (more)
4 Thorleifson, L.H., Kristjansson, F.J. (1993). Quaternary geology and drift prospecting, Beardmore-Geraldton area, Ontario. Geological Survey of Canada Memoir 435, 146p. (more)

Project History

Index Year Project
1 1986-1990 Beardmore-Geraldton, northern Ontario till sampling survey, 1986-1989 (more)

Downloadable Files

Index Description Size (bytes)
Diskette to accompany GSC Open File 2266 ( FileID=208 download)
This ZIP file contains a copy of the data diskette originally released with GSC Open File 2266.

Geographic Extent

Minimum Latitude Maximum Latitude Minimum Longitude Maximum Longitude
49.5° 49.88° -88.2° -86.5°

The geographic extent of the survey is defined by the following polygons:

  • Covers NTS 42E/10 (Geraldton), 42E/11 (Wildgoose Lake), 42E/12 (Beardmore) and parts of 42E/13 (North Wind Lake), 42E/14 (Treptow Lake), 42E/15 (Longlac), 52H/9 (Shakespeare Island) and 52H/16 (Livingstone Point) in northern Ontario.  It is bounded to the west by Lake Nipigon and is 100 km north of Lake Superior.


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