Geography of Sheffield county, from bituminous (ideal for domestic heating) to "Thick Coal", of a semi-anthracitic quality, appropriate for use in iron-smelting and in engine furnaces. Associated with the Upper Coal Measures were valuable iron ore deposits, occurring in the form of nodules. Large quantities of locally occurring fireclay were also exploited, as well as ganister (a clay used to make refractory furnace linings). The city of Sheffield derives its name from the River Sheaf which Until the 17th century was written as "Scheth" or "Sheath". Sidney Oldall Addy equates the origins of this word with the Old English "shed" (as in "water-shed")
English Institute of Sport, Sheffield boxing, fencing, futsal, judo, netball, table tennis and volleyball. There are many clubs which meet at the venue including City of Sheffield Athletic Club, Sheffield Sharks, City of Sheffield Arrows, Sheffield Sword Club, Concorde Netball Club, England Netball, and England Volleyball, as well as hosting snooker's main professional academy. The centre also often hosts sports days for local secondary schools. The venue hosted the European Indoor Trails & UK Championships (athletics) between the 14 – 15 February 2009. They also hosted the European Fencing championships in July 2011. Since 2008, the venue has hosted qualifying matches for The World Snooker