Combining ground stability investigation with exploratory drilling for mine water geothermal energy development; lessons from exploration and monitoring

Walls, D.B., Banks, D. , Boyce, A.J. , Townsend, D.H. and Burnside, N.M. (2023) Combining ground stability investigation with exploratory drilling for mine water geothermal energy development; lessons from exploration and monitoring. Scottish Journal of Geology, 59(1-2), sjg2022-011. (doi: 10.1144/sjg2022-011)

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Abstract

Mine water geothermal energy's potential for decarbonization of heating and cooling in the UK has led to increased national interest and development of new projects. In this study, mine water geothermal exploration has been coupled with ground investigation techniques to assess ground stability alongside seasonal mine water hydrogeology and geochemistry. Drilling operations in late 2020 at Dollar Colliery, Clackmannanshire, Scotland, encountered mined coal seams with varying conditions (void, intact, waste, etc.), reflecting different techniques used throughout a protracted mining history. We found that time and resources spent grouting casing through worked mine seams (ensuring hydraulic separation) can be saved by accessing deeper seams where those above are unworked. Continued assessment of existing water discharges and completion of boreholes with slotted liners into mined coal seams and fractured roof strata allowed chemical and water level changes to be monitored across a 1 year period. Mine water heads and mine discharge flow rates vary seasonally and are elevated between late autumn and early spring. The mine water has a low dissolved solute content. Dissolved sulfate-34S isotope data suggest increased pyrite oxidation during lower water levels. These findings can inform future building decisions, whereby housing developments on site could use the mine water for heating.

Item Type:Articles
Additional Information:This research was supported by EPSRC IAA grant EP/R51178X/1, Energy Technology Partnership Scotland Knowledge Exchange Network Phase 3 - Industry Engagement Fund (PR007-HE) and NERC NEIF grant 2301.0920. N.M.B is funded by a University of Strathclyde Chancellor’s Fellowship. A.J.B is funded by the NERC National Environmental Isotope Facility award at SUERC (NEIF-SUERC, NE/S011587/1).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Banks, Mr David and Walls, Mr David and Boyce, Professor Adrian and Burnside, Dr Neil
Authors: Walls, D.B., Banks, D., Boyce, A.J., Townsend, D.H., and Burnside, N.M.
Subjects:Q Science > QD Chemistry
Q Science > QE Geology
T Technology > TN Mining engineering. Metallurgy
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
College of Science and Engineering > School of Geographical and Earth Sciences
College of Science and Engineering > Scottish Universities Environmental Research Centre
Journal Name:Scottish Journal of Geology
Publisher:Geological Society Publishing House
ISSN:0036-9276
ISSN (Online):2041-4951
Published Online:25 April 2023
Copyright Holders:Copyright © 2023 The Authors
First Published:First published in Scottish Journal of Geology 59(1-2): sjg2022-011
Publisher Policy:Reproduced under a Creative Commons License

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