Gold bearing ore is pulverized by cast iron stampers (steam driven) and material then passes over a large copper plate covered in mercury causing the gold particles to combine with the mercury to form an amalgam which is scraped of and placed in a retort. The retort is heated causing the mercury to evaporate leaving the gold to be refined into ingots. The mercury is cooled as it leaves the retort and is reused. A second tray covered in what is called a blanket traps any fine gold that has passed the first plate. Finally the residue material goes over a vibrating table called a Wilfley Table which captures any iron pyrites which may contain about three percent gold. this is roasted and treated to recover any remaining gold at a special treatment plant.Wooden model of a five heads gold stamper battery. The gold stamper battery is a device for crushing ore. The parts of the battery are cams; dies; guides; kingposts; mortar box; shoes; stamps (or stampers); tappets. gold mining, mining equipment, gold stamper

Two male teenagers sit at a table covered in a white tablecloth. One is being served by a waiter, who is placing potatoes on his plate from a silver tray, whilst the other sits with his plate complete with potato and other foodstuffs that also look a bit like potatoes in variety of ways. Two glasses sit before the teenagers, as does salt and pepper shakers and a small plate with what looks like half a boiled potato topped with slices of cucumber. In the background another waiter is walking past towards a man in a dark white and white shirt (only just visible). The room has wooden panelling and a beige concertina window, possibly concealing the kitchen behind. The wording under the picture reads "Lance and Darren experiencing silver service at a C.O.H.A.T restaurant". This could have been part of a dining experience between students who came to Burwood school and a local TAFE college.Digital image of two boys at a restaurant with a waiterrvib burwood school, education