Airborne radar data: Utility for geological mapping in tropical environments, Serra Pelada, Pará, Brazil

Abstract Airborne Synthetic Aperture Radar (SAR) was acquired over the Carajás Mineral Province, within the rainforests of the Amazon, which hosts the world’s largest Fe-ore deposit (Santos, 1986). Significant chemical weathering exists in this humid environment. Prevalent Au mineralization is thought to be generally associated with deformation zones in Archean schists.
Radar data have proven to be very useful as an aid to geological mapping in the tropical rainforests of the Amazon Basin in Brazil. In these densely vegetated areas, a sense of regional structural trends is obtained as a consequence of the sensor/terrain geometry. The top forest canopy is the main terrain reflector of X-band radar energy, and consequently is the main terrain surface feature expressed in processed radar imagery. Radar is important for extending the continuity of mapped structural lineaments. Differential weathering is related to variations in radar image texture which is used to infer gross lithologic variations and relative age relationships of major rock units. Specifically, quartzites and banded iron formation are highlighted in the radar imagery due to their unique tonal and textural appearance, in contrast to schists, gneisses and metavolcanic rocks. As tropical areas are typically enveloped in cloud or mist, radar data are invaluable in providing information for logistical planning of field mapping activities.
Keywords: Geology, Geological mapping, Airborne Synthetic Aperture Radar (SAR)
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Summary: In the last few decades, microwave energy has been widely employed in food processing, rubber and plastics curing, and in ceramic sintering. Recently, the application of micro waves as an energy source in extractive metallurgy has received considerable attention from a number of researchers. During the period from the mid- 1960s to about 1988, the majority of the research was focussed on the behaviour of materials in microwave radiation. These research activities will continue to be important...
Publication: CIM Bulletin
Author(s): D. K. Xia, C. A. Pickles
Keywords: Metallurgy, Extractive Metallurgy, Microwave energy.
Issue: 1011
Volume: 90
Year: 1997
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Summary: Global Positioning Satellite (GPS) based positioning and navigation systems have been recently developed and implemented by AQUILA Mining Systems Ltd. on blasthole drills and electric cable shovels in Canadian open pit coal and iron ore mines. These systems enable the location of the drill bit or the shovel tracks to be accurately determined in three dimensions.
The position of the drill or shovel is displayed to the operator via a real-time, Moving Map Display (MMD) on an LCD-VGA screen. The...
Publication: CIM Bulletin
Author(s): Jonathan Peck, Carl Hendricks
Keywords: Equipment, Navigation systems, Global Positioning Systems, Open pit mining, Moving Map Display.
Issue: 1011
Volume: 90
Year: 1997
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