Survey Metadata

Soil, Till



Humus, soil and till sampling, NTS 31F/2, Clyde Forks area, Ontario, 1983.

Location map

(requires an Internet connection)

Survey Description

Multi-media sampling was carried out in 1983 in the Clyde Forks area, southeastern Ontario.  In the regional sampling program (154 sites), surficial material was collected at 1 km centres.  In the vicinity of two gold occurrences, more detailed sampling (79 sites) at 100 m centres was completed.  At each site, a sample of the bedrock was taken where available and a hole was hand dug to below the B horizon (0.5 – 1 m depth).  In the F-H horizon, a 250 g sample of the most decomposed (blackest and finest grained) humus was collected.  From the B-horizon, a 250 g sample of the most Fe-Mn enriched (brownest) material was collected.  In cases where the B horizon could not be differentiated from the C horizon, the uppermost part of the C horizon was sampled.  Several samples were collected from the C-horizon: 15 to 20 kg of the till for pebble counts and heavy minerals; 250 g till sample as a “total till”; 250 g till sample for geochemical analysis and a 500 g till sample for future reference and follow-up analyses.  The study is published in Ontario Geological Survey Open File Report 5613.

Data Description:

Paper report, some data lists.

Quantities Analysed:

Au by FA-AAS on: <0.3 mm fraction of humus, <0.177 mm fraction of B-horizon; <4 mm fraction of total till (pulverized to <0.074 mm); and <0.063 mm fraction of till.

Geochem Maps Available:

Contour plots of Au in various size fractions and sample media.  Contour plots of mineralogy of heavy minerals.  Contour plots of pebble counts.

Other Analyses:

Pebble counts; heavy minerals.

Publication History

Index Publication
1 Gleeson C.F., Thomas R.D., Paradis S., Rampton V.N., Martin L. (1986). Development and adaptation of geochemical techniques to gold exploration in glacial drift, volumes 1 to 3. Ontario Geological Survey Open File Report 5613 (more)
2 Gleeson, C.F., Rampton, V.N., Thomas, R.D., Paradis, S. (1989). Effective mineral exploration for gold using geology, Quaternary geology and exploration geochemistry in areas of shallow till. In Drift prospecting, R.N.W. DiLabio, W.B. Coker (ed.). Geological Survey of Canada, Paper 89-20, p. 71-96. (more)

Project History

Index Year Project
1 1983-1986 Clyde Forks area humus, soil and till sampling, southeastern Ontario, 1983 (more)

Geographic Extent

Minimum Latitude Maximum Latitude Minimum Longitude Maximum Longitude
45.1° 45.2° -76.65° -76.5°

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

  • Covers part of NTS 31F/2 (Clyde Forks) in southeast Ontario.  It is located 82 km southwest of Ottawa and 50 km northwest of Perth.  It covers parts of Lanark and Renfrew counties.


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