RT Journal Article SR Electronic(1) A1 Bourgeois, B. A1 Bernard, J.YR 1991 T1 Application of a surface-to-borehole frequency EM method for the detection of deep conductive orebodies: A test study in the Iberian Pyrite belt JF , VO OP SP cp-42-00116 DO https://doi.org/10.3997/2214-4609.201410859 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609.201410859