Water in abandoned mine workings is a potential source of geothermal energy. It can used in space and water heating. The thermal energy that can be obtained tends to increase with depth. Alongside other data from the Scotland Heat Map, depth information is used to identify areas where geothermal energy could be used as a low carbon, renewable heat source. Depth is given in meters and is displayed using contour lines.
This data comes from a 2013 Scottish Government commissioned study into the potential for deep geothermal energy. The work was carried out by the British Geological Survey (BGS) and AECOM. BGS used an existing data source to create a model to estimate depth, no new measurements were taken. More information can be found in the study report on the Scottish Government website: https://www.gov.scot/publications/study-potential-deep-geothermal-energy-scotland-volume-2/