| Ganister is a rock that when ground and mixed with fire-clay has a very high tolerance to heat. |
| Mineral extraction has also occurred above St John's Chapel with the extraction of ganister which was used in the steel process at Consett. |
| After covering all the exposed steel surfaces with ganister, the plates are put in a gas furnace and heated to a welding heat. |
| These clays are highly silicious and in composition are intermediate between the Yorkshire fireclays and ganister. |
| It was originally erected to allow workmen across the river to work in the ganister mines of Beeley Wood and the factories in the Clay Wheels Lane area of Sheffield. |
| Local names, including Copperas House and Ganister, suggest that other material was extracted from the ground at Woodroyd. |
