Thermal infrared-based data collected along the Lake Fork Creek corridor and wetland area in Leadville, Colorado, 2024

Multiple sources of mine drainage including discharge from the abandoned Dinero mine tunnel and two gulches flow into a wetland, known herein as the Dinero wetland along the Lake Fork Creek corridor. The Dinero wetland is approximately 20 acres in extent. The Dinero wetland is being considered as a location for passive treatment of the mine drainage flowing through it. As such, study objectives are to understand: (1) variations in pH, specific conductance, and temperature in surface water in the wetland; (2) metal loading into and out of the wetland; (3) the configuration of surface drainage features; (4) the configuration of subsurface conductive features; and (4) depth to bedrock in the wetland. These data will be used to help understand whether the wetland is currently and naturally treating the mine drainage flowing through it and will help pinpoint locations needing additional investigations to help inform potential passive treatment scenarios. Visual and thermal infrared images were collected in an alpine wetland downgradient of the Dinero Tunnel mine portal near Leadville Colorado on July 17, 2024. Data were collected on foot with a FLIR E8XT Thermal Camera on July 17, 2024 along the "flir_survey_path2D" path included in this release, with the following manufacturer specifications: Resolution: 320x240 pixels Spectral range: 7.5 - 13 µm Thermal sensitivity: less than 50 mK Accuracy: ±2°C (±3.6°F) or ±2% of reading above 0°C Data collection was carried out in a reconnaissance mode wherein the camera was left on throughout the survey and used to scout for cold wet areas potentially indicative of groundwater discharge. Photographs were typically only taken when cold features were observed. An EMLID Reach RS2+ base station was established, while a rover antenna receiving real-time kinematic (RTK) corrections was used to record the positions where the photographs were taken. Minimum spot temperatures from each image were extracted and are served in the data table of this release. The "flirmap.html" document is a self-contained visualization of these minimum spot temperatures that can be clicked to show the original FLIR imagery. All temperature measurements should be interpreted as 'apparent' as the thermal parameters of the camera have been set to assumed values for water and may not apply to reflected radiation off the water surface or other types of materials such as grass and soil.

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  "geospatial"
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