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Remediation of Abandoned Mine Lands |
This study utilizes airborne hyperspectral imagery to map the surface mineralogy of these systems. The hyperspectral imagery is composed of 227 bands which finely sample the reflected light between 446 nanometers and 2441 nanometers for each pixel. It was flown with a spatial resolution of 2.5 meters. The spectroscopy of each pixel is analyzed to determine the mineralogical composition of the surface. Jarosite, goethite, hematite, illite, kaolinite and dickite are mapped. Furthermore, spectral unmixing approaches are utilized to map the relative concentrations of these minerals.
The results of the analyses show that acidic seeps and springs are identified by the concentration of jarosite relative to goethite and hematite and that these minerals are distinctly zoned. Some of the identified seeps are very subtle and not apparent in the field. The clay mineralogy also appears to reflect the presence of acidic ground waters. Although shown in the context of a natural system, the technology is applicable to mine waste monitoring and characterization.
David W. Coulter, Ph.D., Overhill Imaging and Cartography LLC Dr. Coulter has been involved in remote sensing for exploration and mining for over 25 years. He was Manager of Remote Sensing at Newmont Mining Corporation from 1985 to 2001. His focus is on exploiting hyperspectral and multispectral imagery for generating exploration targets. From 2002 to 2006 he was involved in the use of hyperspectral imagery to map anthropogenic and natural acid drainage in the Leadville District and Grizzly Peak Caldera in Colorado for a NASA funded project managed by the Colorado Geological Survey. He earned a Ph.D. from the Colorado School of Mines in 2006 based on this work.