Spectrem Air is a small group of geophysicists and engineers developing and operating airborne time-domain electromagnetic (EM) prospecting systems. SPECTREM's two current systems are SPECTREM2000, for fixed wing aircraft, and ExplorHEM for helicopters. Both of these EM systems are usually applied to mineral exploration, but can also be used in other fields like environmental investigation.
Spectrem Air Ltd is a wholly owned subsidiary of Anglo Operations Ltd. Management and Logistics are controlled from Johannesburg, South Africa.
The Anglo American Group has invested about $20 million and 15 years of development effort into the Spectrem2000 fixed wing and ExplorHEM helicopter systems, in order to afford the Group a significant competitive advantage over that possible by utilizing the services of commercial survey companies.
Both the Spectrem2000 and ExplorHEM systems are currently the most modern and arguably the best available.
Fundamental Design Differences
The fundamental design of the Spectrem2000 and the ExplorHEM systems are similar. These systems vary considerably from the commercial platforms in that they are on-time systems i.e. the systems transmits a 100% duty cycle square wave, and measures 3 receiver components continuously and simultaneously.
This configuration and design tenant has a number of advantages, most notably that
More energy is induced into the ground
The output data is STEP response, and relatively easy to interpret and apply additional processing with standard tools.
The system bandwidth is extremely high
Both shallow and ultra-deep soundings can be performed
Electromagnetic Surveys
The usefulness of SPECTREM Airborne Electromagnetic surveys is not limited to traditional mineral exploration programs, mostly direct detection of massive sulphides, kimberlites etc for which they were originally developed. Other applications include
Environmental Work
Ground Water Modelling, Pollution Monitoring etc
Potable Water Drill Hole Siting
Bathymetry
Detailed Structural Mapping
And in the case of the SPECTREM2000 potentially for oil exploration
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