Roman metallurgy the most important being bronze, an alloy of copper and tin. Alloys are mixtures of different metals created either by smelting or by forging. It is important to note that an ore does not necessarily constitute an alloy; ore is a collection of minerals and alloyed metals. As metallurgical technology developed (hammering, melting, smelting, roasting, cupellation, moulding, smithing, etc.), more metals were intentionally included in the metallurgical repertoire. By the height of the Roman Empire, metals in use included: Gold, Silver, Copper, Tin, Lead, Zinc, Iron, Mercury, Arsenic, Antimony (Healy 1978). As in the Bronze Age, metals were used based
Sundown Tin and Copper Mine furnace were in working order. 30 tons of arsenic and 5.4 tons of copper were produced in 1922, and 200 tons of arsenic in 1923. In 1924 the furnace and part of the mill was leased by Arsenic Limited to O.C Roberts Limited, who remodelled the furnace to treat high-grade ore, as a result of the Prickly Pear Land Commission letting a 12-month contract for the supply of Roberts Improved Pear Poison, which was manufactured at Wallangarra. The ore was to come form the nearby Beecroft Mine. The arsenic works ceased operation in 1925, and tin does not seem to