Survey Metadata

NGR lake

British Columbia


BC RGS lake sediment and water survey; NTS 93F/2, 3, 6, 11, 12, 13, 14, northern Interior Plateau, British Columbia, 1993.

Location map

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Survey Description

Lake sediment and water samples were collected in a helicopter-supported survey in two areas in the Nechako map area, northern Interior Plateau, British Columbia:

Area and Date of Collection Total Number of Sediment and Water Samples Total Number of Sites Average Sampling Density


June 15-18, 1993

251 237

1 site per 8 km2


September 17-19, 1993

238 224

1 site per 7.4 km2


Sediments were sampled using a Hornbrook-type torpedo sampler and samples placed in large Kraft paper bags.  Some departures from standard national Geochemical Reconnaissance (NGR) sampling strategies were incorporated particularly pertaining to overall site density and the number of sites sampled in each lake.  First, every lake in the survey area was sampled rather than sampling only a selection of lakes at a fixed density.  Secondly, centre-lake sediment samples were collected following standard NGR procedure, but sediment from the centres of all major known or inferred sub-basins was also collected.

The data are published in BC Open File 1994-19.

This survey was carried out using National Geochemical Reconnaissance (NGR) protocols.

Sampling Procedure

Lake water samples were collected in 250 mL Nalgene bottles using a custom-designed sampling apparatus.  Waters were sampled from approximately 15 cm below the lake surface and precautions were taken to minimize suspended solids.

Publication History

Index Publication
1 Cook, S.J., Jackaman, W. (1994). Regional lake sediment and water geochemistry of part of the Nechako River map area (93F/2, 3; parts of 93F/6, 11, 12, 13, 14). B.C. Ministry of Energy, Mines and Petroleum Resources, B.C. Geological Survey Branch, Open File 1994-19. (more)

Project History

Index Year Project
1 1993-1996 Interior Plateau, Project/Nechako NATMAP Project, British Columbia (more)

Geographic Extent

Minimum Latitude Maximum Latitude Minimum Longitude Maximum Longitude
53° 54° -125.93° -124.5°

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

  • Covers NTS 93F/2 (Tsacha Lake) and /3 (Fawnie Creek) in the  northern Interior Plateau of British Columbia.  It is bounded by latitudes 53° and 53.25° N and longitudes 124.5° and 125.5° W.

  • Covers parts of NTS 93F/6 (Natalkuz Lake), /11 (Cheslatta Lake), /12 (Marilla Lake), /13 (Takysie Lake), /14 (Knapp Lake) in the northern Interior Plateau of British Columbia.  It is bounded to the southwest by the Nechako Reservoir.  François Lake is located just north of its northern edge.


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