Hood, P.J. and D.J. Teskey, Aeromagnetic gradiometer program of the Geological Survey of Canada, Geophysics, 54, 1012-1022, 1989.
During the past two decades, the Geological Survey of Canada Aeromagnetic Survey Group, consisting of geophysicists, electronic engineers, technicians, and computer scientists, developed the aeromagnetic gradiometer technique for mineral exploration. The same group ran the aeromagnetic survey program in Canada, perhaps the largest such continuing aeromagnetic survey program in the world. In 1973, fabrication commenced on an inboard vertical gradiometer system on the GSC Queenair aeromagnetic survey aircraft. During the period 1978-1981, a number of experimental gradiometer surveys were carried out by the Geological Survey of Canada to demonstrate the efficacy of the aeromagnetic gradiometry technique as a geologic mapping tool in mineral exploration programs.
Because of a need for aeromagnetic gradiometer surveys in the topographically rugged Gapsé Peninsula of Quebec, the GSC began in 1983 to foster the development of helicopter-borne gradiometer systems through R and D contracts. Four companies responded and build towed-boom helicopter gradiometer systems which have now been used in surveys in four eastern provinces.
It is clear that the aeromagnetic gradiometer technique combined with VLF EM is an excellent geophysical tool to improve the accuracy of detailed geologic mapping for mineral exploration programs. VLF EM is an inexpensive add-on that materially improves the geologic mappin g capability of the air-borne system. The product in color-pixel form is in essence a pseudogeologic map and it is presently being employed as such.
- Fraser, D.C., 1969, Contouring of VLF-EM data: Geophysics, 34, 958-967.
- Geological Survey of Canada, 1982, High-resolution total field and vertical gradient aeromagnetic maps ¾ Val D'Or, Quebec: total field, 20241G; vertical gradient, 40241G.
- ¾¾¾ 1984a, High Resolution total field and vertical gradient aeromagnetic maps ¾ Wollaston Lake, Saskatchewan: total field, 20353G; vertical gradient, 40094G.
- ¾¾¾ 1984a, High Resolution total field and vertical gradient aeromagnetic maps ¾ Wollaston Lake, Saskatchewan: total field, 20354G; vertical gradient, 40095G.
- ¾¾¾ 1986a, High Resolution total field and vertical gradient aeromagnetic maps ¾ Lynn Lake, Manitoba: total field, 21091G; vertical gradient, 41091G.
- ¾¾¾ 1986b, High Resolution total field and vertical gradient aeromagnetic maps ¾ McGavock Lake, Manitoba: total field, 21084G; vertical gradient, 41084G.
- ¾¾¾ 1986c, High Resolution total field and vertical gradient aeromagnetic maps ¾ Opachaunan Lake, Manitoba: total field, 21103G; vertical gradient, 41103G.
- Haalck, H., 1925, Zeitschrift für tech. Physik: Leipzig, 6, 377-380.
- Hood, P.J., 1965, Gradient Measurements in aeromagnetic surveying: Geophysics, 30, 891-902.
- ¾¾¾ 1981, Aeromagnetic gradiotmetry: a superior geological mapping tool for mineral exploration, inWeinstock, H., and Overton Jr., W.C., Eds.: Squid Applications to Geophysics, Soc. Explor. Geophys., 72-77.
- ¾¾¾ 1986, Discussion on "Important design considerations for inboard magnetic gradiometers" by C.D. Hardwick in Geophysics, 49, 2004-2018, 1984: Geophysics, 51, 192-193.
- Hood, P.J., Holroyd, M.T., and McGrath, P.H., 1979, Magnetic methods applied to base metal exploration, in Geophysics and geochemistry in the search for metallic ores, Hood, P.J., Ed.:Geol. Surv. Can., Econ. Geol. Rep. 31, 77-104.
- Hood, P.J., Irvine, J., Hansen, J., 1982, The application of the aeromagnetic gradiometer survey technique to gold exploration in the Val D'Or mining camp, Quebec: Can. Min. J., 103, no. 9, 21-39.
- Hood, P.J., and McClure, D.J., 1965, Gradient Measurements in ground magnetic prospecting: Geophysics, 30, 403-410.
- Hood, P.J., Sawatzky, P., Kornik, L.J., and McGrath, P.H., 1976, Aeromagnetic gradiometer survey, White Lake: Geol. Surv. Can., Open-file rep. 339.
- ¾¾¾ 1979, Aeromagnetic gradiometer survey, White Lake, Ontario: Atomic Energy of Canada Ltd., Technical Record TR-11.
- Hood, P., and Teskey, D.J., 1987, Helicopter-borne aeromagnetic gradiometer surveys: a progress report, in Current Research, Part A, Geol. Surv. Can., Paper 87-1A, 935-938.
- Kornik, L.J., 1982, Aeromagnetic gradiometer results in the Wollaston Lake area, Saskatchewan, Canada, in Uranium Exploration Methods: Proc. NEA/IAEA Meeting, Paris, June 1-4, 1982, 605-619.
- Mooney, H.M., and Bleifuss, R., 1953, Magnetic susceptibility measurements in Minnesota, Part 2: Analysis of field results: Geophysics, 18, 383-393.
- Roman, I., and Sermon, T.C., 1934, A magnetic gradiometer: Trans. A.I.M.E., 110, 373-390.
- Slack, H.A., Lynch, V.M., and Langan, L., 1967, The geomagnetic gradiometer: Geophysics, 32, 877-892.