Metal gold retort, it has a two parts circular container attached to crook shaped long handle. A caption reads Mr. G. Humphrey. An amalgam (gold and mercury) is placed inside and fire built around outside. Mercury vaporizes away leaving the gold. Diameter of retort 23 cm. Overall size 37x75 cm.mining, equipment, retort

Ore bearing rock brought out of the mine was crushed at the battery by heavy metal stampers and the fine material passed over copper pates coated with mercury. Gold particles would combine with the mercury forming an amalgam which was then scrapped off the copper plates and put into the amalgam bucket ready for retorting too extract the gold. The amalgam of mercury and gold was placed into the retort which was heated to evaporate the mercury. The mercury cooled as it ran down the pipe which was recovered to be reused leaving the gold behind. The gold would later be put into a crucible and heated to burn of impurities and the molten pure gold poured into an ingot.A heavy cast iron bucket 20 centimetres high, 16 centimetres in diameter at its base and 22 centimetres diameter at the top. It has a spout five centimetres wide protruding two centimetres. There is a handle which is a semi- circular shape 19 centimetre wide extending 14 centimetres above the bucket The inside of the bucket has an enamel coating. amalgam bucket, bendigo gold, gold retort

"The United Pyrites Company's Works are situated about three quarters of a mile from Spargo Brothers, and are on the northern side of the Marong road, in Pinch-gut Gully. Two processes are followed at these works, viz., the amalgamating process and the treatment by means of chlorine gas. The latter is called the Newbery-Vautin system, and the mode pursued is that laid down by Mr. Cosmo Newbery and Mr Vautin, whose names have been given to the process. Mr. Edwards manages these works. Three reverbatory furnaces are used to roast the pyrites, which is weighed in the truck before being put into the furnaces. At this weighbridge a sample of each lot is kept, and if the yield is not equal to expectation, the works are carefully gone over to see where the fault occurs. Care is taken at the furnace to regulate the heat, otherwise the pyrites might slag instead of roasting evenly right through. An immense revolving furnace (made of boiler iron) was used at these works. It was found to be suitable for treating blanket sand, but was not a success for roasting coarse pyrites. The process of amalgamating by means of Chilian mills is the same in these works as at the Western Works, but the United Works are on a larger scale, and eleven mills are utilised. It is the chlorine gas process which is most interesting here. The gas is made from sulphuric acid, black oxide of manganese, and common salt, and the gas is introduced into huge vats, where it works its way through a filter of pieces of quartz and then through the bed of roasted pyrites lying above. The action of the gas transforms the gold into chloride of gold. This is easily dissolved in water, and in that form is drawn off into huge delf jars, where the use of sulphate of iron precipitates the gold to the bottom. A small battery—eight head of stamps in two boxes—is in use here to crush small consignments of stone sent for trial. Test crushings come from all the Australasian colonies, and even from India. The jars used are manufactured at Epsom, and some of the salt used is also of home manufacture, from the Salt Lakes on the Northern plains. Mr. Edwards took us over a new building in course of erection, and in which the chlorine gas is to be generated in the midst of the pyrites— a still further advancement in the new process. There is some very good machinery in this new building, and the tailings from the ordinary pyrites works will also be treated by this chlorine gas system, which has been found to work well at Mount Morgan, in Queensland. The purest of gold is obtained by this process, the gold passing in solution into a charcoal filter, from which it emerges in the shape of metallic gold. We saw some nice cakes of retorted gold at the works. One of 26oz. was from some New Zealand pyrites (2½ tons), and assayed over 23 carats. There were also cakes of Avoca gold, of silver, and of the tremulous amalgam." (The Argus, 4 February 1887)Two handwritten letters to the Ballarat School of Mines on Bendigo United Pyrites Company Letterhead.bendigo united pyrites company, pyrites, ballarat school of mines, j.j. deeble, joel deeble, joel james deeble, a.m. dean, fred j. martell, martell, s.h. cowan, letterhead

Cast iron mercury bucket, used to hold mercury, potentially in the process of recovering minute pieces of gold mixed in soil and sediments. See research page for description of one process of using mercury to extract gold.gold mines, mining equipment, mercury bucket, miners used mercury in a number of ways to amalgamate gold, with each mill or battery operator having their preferred method depending on the nature of the ore. by the late 1850s the most common way of crushing goldbearing quartz ores or consolidated alluvial cements was in a stamp battery. the battery featured heavy iron stamp heads held in a frame, with each head often weighing up to 500 pounds (226 kg) or more (see msv 1880, page 45) (birrell 2005). stamp heads were lifted and dropped by a rotating overhead cam shaft driven by a steam engine or water wheel. ore was fed into a large cast-iron battery box, mixed with a steady stream of water, and pulverised by the stamp heads. in some batteries, mercury was placed in the base of the boxes to amalgamate with freed gold. the violent agitation of the mercury in the mortar box, however, could cause the mercury to break into myriad tiny globules that were carried away by the water with the tailings, thus losing a certain amount of gold in the process (thompson 1867; ritchie & hooker 1997). the water and sand slurry was splashed by the falling stamps from the box through fine mesh screens and onto inclined wooden tables below the mortar box (figure 2). the tables were covered with copper sheets or plates coated with mercury, which caught and amalgamated with a portion of the gold. the grey putty-like amalgam was periodically scraped off the sheets and retorted in a furnace to collect the gold and recover the mercury for reuse. mercury was inevitably lost from the plates, while poor maintenance resulted in further losses of gold and mercury in the tailings. mercury use and loss from gold mining in 19th century victoria. peter davies1, susan lawrence, and jodi turnbull, department of archaeology and history, la trobe university.

This photograph shows the pre-heater on the left and the furnace on the right. After clean up of stamper table, amalgam is placed in a retort, then placed in the furnace where mercury is condensed and runs down the small pipe into an enamel bucket and can be reused. This is one of a series of photographs of the Rutherglen Gold Battery. The battery's purpose was to crush quartz from nearby quartz reefs and extract gold from within. The battery was erected in 1908 and consists of a five-head battery, Wilfrey table, Bergin pan, portable steam engine and shed. The battery was restored in 2011/12 and can be viewed daily between 9.00am and 5.00pm. See website for details.Colour photograph of the interior of a room with corrugated iron walls, with a fireplace on the left and a furnace on the right.gold battery, gold processing

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

Magdala cum Moonlight Mine c1900 Buildings include the mine managers office, change rooms, crushing battery, retorting room, blacksmith shop and cyanide vats. Fence advertises "Drink RoBur Tea"B/W Photo of Magdala Mine Works in middle distance with two tailing Dams. stawell gold mining