“…Among a number of mine water, heat pump systems operating worldwide can be listed: Park Hills, Missouri, USA (Watzlaf and Ackman 2006;DOE 2015), Springhill, Nova Scotia, Canada (Jessop 1995;Jessop et al 1995;Raymond et al 2008), Marywood University, Pennsylvania, USA (Korb 2012), several in Saxony, Germany (Ramos et al 2015), Henderson molybdenum mine, Empire, Colorado, USA (Watzlaf and Ackman 2006), Saturn coal mine, Czeladz, Poland (Malolepszy et al 2005;Tokarz and Mucha 2013), and Novoshakhtinsk, Russia (Rostov Regional Government 2011; Ramos et al 2015). At a MW (megawatt) scale, one can mention the hospital and university heating/cooling system sourced from Barredo coal mine shaft at Mieres, Asturias, northern Spain (Loredo et al 2011;Ordóñez et al 2012;Jardón et al 2013;Banks 2017) and the Heerlen scheme, The Netherlands (Minewater Project 2008;Ferket et al 2011;Verhoeven et al 2014;Banks 2017).…”