Ughill
The fire brick company Thomas Wragg & Sons owned a Pot Clay mine immediately to the south east of the hamlet. Pot Clay is the impure version of Ganister and was in demand in the Sheffield steel industry to make bricks for the lining of furnaces. In the early 1970s the mine was producing 15,000 tons of clay per year, with the company quoting, “The mine can be worked at the present rate for 100 years”. A refractory brick works stood at the entrance to the mine. However the Ughill mine had drainage problems and although powerful pumps had been installed in the 1950s to pump between 600 and 800 gallons per minute from the mine, the mine closed on 17 November 1977. It had become uneconomic to mine the clay due to water problems and the owners found it more profitable to bring in clay from the Midlands. The site of the mine has been landscaped and returned to agricultural use. J&J Dyson mined fireclay at their open cast quarry at Wheatshire between Ughill and Sugworth. The quarry is closed but can still be seen from the nearby road. Thos. Wragg had small firebrick works at Load Brook (closed 1957) and Brookside (Stopes Road, Stannington, closed 1960) the former previously owned by the Trickett family, the latter by the Drabble family and a major works (Old Wheel Brick Works) in the nearby Loxley Valley. Wraggs along with its local competitors, J&J Dyson of Griffs Works, Stannington and Thos. Marshall of Storrs Bridge Works, Loxley, mined the Stannington Pot Clay seam and manufactured fireclay-based casting pit holloware refractories for use in steel making worldwide. All three plants closed following a collapse in demand for casting pit refractories of the type made locally mainly because of the introduction of continuous casting of steel worldwide and the general demise of the British steel industry.
Brickworks
In a large industrial brickworks, clay is taken from the quarry, and then carried by conveyor belt or truck/lorry to the main factory, although it may be stockpiled outside before entering the machinery. When the clay enters the preparation plant (Clay Prep) it is crushed, and mixed with water and other additives which may include breeze, a very fine anthracite that aids firing. This process, which is also known as pugmilling, improves the consistency, firing qualities, texture, and colour of the brick. From here, the processed clay can be extruded into a continuous strip and cut with wires, or put into moulds or presses (also referred to as "forming") to form the clay into its final shape. 
After the forming or cutting, the bricks must be dried, either in the open air, in drying sheds, or in special drying kilns. When the bricks have been dried, they must then be fired or 'burnt' in a kiln, to give them their final hardness and appearance.
The brick manufacturing process was revolutionised in the mid nineteenth century with the development of automated brickmaking machines such as the Bradley & Craven Ltd ‘Stiff-Plastic Brickmaking Machine’.