1887
Volume 11, Issue 4
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

Gravity and magnetic investigations prior to the discovery of the Elura field, at Cobar, Australia in 1974 indicated an anomalous body 250 m in length, 120 m in maximum width and a depth to the top of 90 m. The body dips 80° W and assuming a density contrast of 1600 kg/m3 between mineral and host rock, the body would have a mass of 34.4 million tonnes. The interpretation presented compares well with the post drilling model.

© 1980 ASEG
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1980-12-01
2026-01-17

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References

  1. BLACKBURN, G. J., 1974. Geophysical studies at Elura, Cobar: unpub. B.Sc. Honours thesis. University of Tasmania.
  2. BLACKBURN, G. J., 1980. Elura orebody, Australia - a case history: unpub.
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  8. HAMMER, S., 1945. Estimating ore masses in gravity prospecting. Geophysics, V. 10 (1), 50-62.
  9. JOHNSON, E. A., 1935. The limiting sensitivity of an alternating current method of measuring small magnetic moments. Rev. Sci. Instr., v. 9, p. 263.
  10. KAPPELLE, K., 1970. Geology of C.S.A. mine, Cobar, N.S.W. ft-oc. Aust. Inst. Min. Metall., v. 233, 79-94.
  11. MARQUARDT, D. W., 1963. An algorithm for least squares estimation of non-linear parameters. J. Soc. Indust. Appl. Math., v. 11 (2), 431-442.
  12. MOONEY, H. M., ORELLANA, E., PICKETT, H., and TORNHEIM, L., 1966. A resistivity computation method for layered earth models. Geophysics, v. 31 (1), 192-302.
  13. RICHARDSON, L. A., and KEATING, W. D., 1947. Preliminary report on a geophysical survey at Cobar, N.S.W.: unpub. report. Geological Survey of N.S.W., G.S. 1947/038.
  14. ROY, A., 1966. The method of continuation in mining geophysical interpretation. Geoexploration, v. 4, 65-83.
  15. TALWANI, M., 1965. Computation with the help of a digital computer of magnetic anomalies caused by bodies of arbitrary shape. Geophysics, v. 30 (5), 797-817.
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  17. THOMSON, B. P., 1953. Geology and ore occurrence in the Cobar district. Geology of Australian Ore Deposits, Publs. 5th Emp. Min. Metall. Congr. Aust. N.Z., v. 1, 863-896.
  18. YUNGUL, S., 1956. Prospecting for chromite with gravimeter and magnetometer over rugged topography in eastern Turkey. Geophysics, v. 21 (2), 433-454.
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