An underground UHF-EM transillumination experiment at the Big Nickel Mine in Sudbury, Canada

Authors

  • P. T. LaFleche,

  • O. G. Jensen


Abstract

The Geophysics Laboratory of McGill University investigated the use of UHF-EM transillumintion measurements in geophysics through the construction of a prototype 445-MHz continuous-wave transillumination instrument designed for underground use in geophysics. Test surveys with this instrument were conducted at the Big Nickel Mine in Sudbury, Ontario, to obtain through-rock electromagnetic absorption rates. Measurements were made at several sites between underground drifts and the surface. The results of the field surveys indicate that the UHF-EM transillumination technique is feasible and, under strictly defined field conditions, can provide useful information on the in situ electrical properties of rocks.

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