The review on international practices of thermal energy recovery at closed mines

Purpose. Comparative study and efficiency analysis of operating geothermal systems installed in different countries to recover heat from mine water and rocks in post-coalmining areas. Methodology. The research methods included collecting, systematizing and analyzing of actual data on the principles, designs, features, and performance indicators of open and closed geothermal systems operated at closed mines in different countries currently introducing advanced technologies of alternative power generation.