An airborne imaging scanner survey was flown over two areas in the Duluth
Complex and one area along the Vermilion fault zone on September 12, 1988 to
detect heavy metal induced stress in plants due to the presence of buried mineral
deposits. The Duluth Complex flight lines covered copper-nickel and iron-titanium
mineral deposits while the Vermilion fault flight line covered Archean gold
mineralization sites. The 63 channel imaging scanner had a spatial resolution of
about 9-10 meters and a flight path width of approximately 6.4-7.2 kilometers along
three flight lines.
Supervised, unsupervised, principal components and inverted principal
components analysis and Chebyshev polynomial expansions were used on data
collected over two test sites, i.e., the east end of the Archean flight line and the
Dunka Pit area, to learn whether or not vegetative stress could be identified in areas
with known metallic mineralization. Interpretation of the Dunka Pit test site was
abandoned because: 1) the test site was too small; 2) much of the canopy was
dead; and 3) the test site was overwhelmed by an adjacent, highly reflective mine
dump. At the Archean site, ground spectroradiometer data was collected to assist
with the interpretation of the imaging scanner data. The ground data indicated
spectral shifts to both longer and shorter wavelengths in vegetation over mineralized
compared with unmineralized sites. However, the imaging scanner data did not
indicate any evidence of vegetative stress in mineralized areas. At this point, the
imaging scanner survey data are useful mainly for discriminating different types of
The files attached to this record include the report (GMIN-TR-1989-13.pdf) and the Plates 1, 2A, and 2B mentioned in the report (along with the labels on the plate pockets). Please note that while the report describes Plates 2A and 2B as two separate plates, they were firmly taped together with scotch tape so were digitized as one item. Appendix D on the disk in the back pocket has yet to be located.
Natural Resources Research Institute, University of Minnesota Duluth, 5013 Miller Trunk Highway, Duluth, MN 55811-1442; Minerals Division, Department of Natural Resources, P.O. Box 45, St. Paul, MN 55155; U.S. Geological Survey, Mail Stop 927, Reston, VA 22092; Funded by the Minerals Coordinating Committee Through the Minerals Diversification Plan
Hauck, Steven A; Ager, Cathy; Pastor, John; Zanko, Lawrence M; Aaseng, N.
Airborne Imaging Scanner Survey of Northeastern Minnesota.
University of Minnesota Duluth.
Retrieved from the University of Minnesota Digital Conservancy,
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