GSC Open File Release Notices

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The following items are being placed on Open File for inspection at the libraries of the Geological Suvey of Canada, 601 Booth Street, Ottawa, K1A 0E8; the Institute of Sedimentary and Petroleum Geology, 3303-33 ^rd Street, Calgary, Alberta; the British Columbia Office, 6 ^th Floor Sun Building, 100 West Pender Street, Vancouver 3, British Columbia and at the Office of the Resident Geologist, Indian Affairs and Northern Development, Box 1500, Yellowknife, N.W.T.

Radioactivity maps and profiles from the GSC gamma-ray spectrometer system relating to the area southeast of Port Radium, Northwest Territories, in the Bear and Slave Provinces of the Canadian Shield, covering map sheets Winter Lake (86A), Indin Lake (86B), Hardisty Lake (86C), Calder River (86F), Redrock Lake (86C) and Point Lake (86H).

The file is comprised of profiles of east-west flight lines, reproduced at a scale of 1:500,000, and seven contoured maps showing levels of total gamma-ray activity, uranium, thorium, potassium and U/Th, U/K and Th/K ratios reproduced at a scale of 1:250,000.

Blackline copies of the maps and profiles may be obtained at the user’s expense by application to Campbell Reproductions Limited, 85 Sparks Street, Ottawa, Ontario K1P 5A7.