Archived: Interstate Technical Group on Abandoned Underground Mines
Fourth Biennial Abandoned Underground Mine Workshop
Outline: Use of Airborne Thermal Infrared Imaging, EM Conductivity, Total Field Magnetics to Identify Faults,
Acid Mine Drainage Plumes, and Groundwater Discharge Zones
Abstract ]
Richard W. Hammack
Thermal Infrared Imaging
- Locates springs, seeps, and mine discharges
- Acquired from aircraft platform
- Night-time data collection during winter months
Maximizes thermal contrast between surface and groundwater
Temperature resolution - 0.1 degrees centigrade - Correction of imagery
Aircraft attitude
Topographic
Polynomial stretching using ground control points - Examples
Mine discharges
Seeps and springs
Cultural anomalies
EM Conductivity
- Locate plumes of contaminated (conductive) groundwater
- Locate alteration envelopes along fault zones
- Acquired from helicopter platform (sling load)
- Data processing
Contoured data overlain on DOQQ or draped from a DEM
Cross-sections using inverted conductivity data - Examples
Plume of contaminated groundwater
Faults
Sources of acidic groundwater
Total Field Magnetics
- Locates geologic contacts and faults
- Acquired from aircraft platform
- Detects differences in the abundance of magnetic minerals
- Data processing
Contoured data overlain on DOQQ or draped from a DEM
- Examples
Lava flow
Faults
Resistivity
- Locate mine subsidence "chimneys"
- Vertical grout distribution
- Ground
- Example
I77 Guernsey County, Ohio