Collapse processes in abandoned pillar and stall coal mines: implications for shallow mine geothermal energy

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Abstract

Flooded mine workings represent potential aquifers for shallow geothermal development projects. However, determining the collapse state of such workings in advance of drilling, and predicting their hydrogeological properties can be challenging, therefore developing an understanding of the products of mine collapse is important. We investigate the internal structure of collapsed pillar and stall mine workings exposed through coastal erosion near Whitley Bay, NE England. Our data suggests these workings collapsed in stages, leaving a clay-rich anthropogenic sedimentary layer consisting of collapse breccias and muds that will have gradually reduced the water capacity of the mine workings as collapse proceeded.
Original languageEnglish
Article number101904
JournalGeothermics
Volume88
Early online date18 Jun 2020
DOIs
Publication statusE-pub ahead of print - 18 Jun 2020

Keywords

  • geothermal energy
  • geology
  • coal mining
  • heat pumps
  • geotechnical engineering

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