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ABSTRACT Newmont developed an airborne electromagnetic (EM) system during the period 1995 – 2001. This system, called NEWTEM, was designed primarily for gold exploration in both conductive and resistive environments, although it likely has application to a wide range of problems within the mining exploration industry and beyond. A portion of the development effort involved collaboration with Normandy and resulted in an alternative system, designed with somewhat different objectives in mind, called HOISTEM. Both systems are now operated by Newmont but this paper will focus entirely on the NEWTEM system. This airborne EM system has recently been applied in some particularly challenging situations. For example we have used it successfully to map resistivities in the high Andes of Peru at elevations in excess of 14,000 feet and along rugged profiles whose relief varied by as much as 5000 feet. In addition to deriving important lithological and structural information in these surveys, we identified several high and low sulfidation gold deposits and also mapped the signatures of porphyry and skarn systems.
- South America > Peru (0.26)
- North America > United States > Colorado (0.17)
Closing the Gap Between Research And Practice In EM Data Interpretation
Oldenburg, Douglas W. (University of British Columbia) | Shehktman, Roman (University of British Columbia) | Eso, Rob A. (University of British Columbia) | Farquharson, Colin G. (University of British Columbia) | Bolin, Brock (Newmont Mining Corporation.) | Eaton, Perry (Newmont Mining Corporation.) | Anderson, Bob (Newmont Mining Corporation.)
Summary Electromagnetic data from a CSAMT survey consisting of two transmitter electrodes and multiple frequencies are inverted to generate a 3D distribution of electrical resistivity. The results are compared with those from a 2D inversion which assumes the data are in the far field, and to a 3D resistivity model obtained by inverting DC resistivity data. CDI resistivity images and results from 1D inversions of time domain EM data are also included for comparison. The data are acquired from Antonio, a high sulfidation gold deposit in the Peruvian Andes. The consistency between the 3D images shows that we are making substantial progress in reducing the gap between state–of–the–art research and practical implementation of inversion codes and interpretation of EM data.