Alloy are relatively similar in size, the atom exchange method usually happens, where some of the atoms composing the metallic crystals are substituted with atoms of the other constituent. This is called a "substitutional alloy". Examples of substitutional alloys include bronze and brass, in which some of the copper atoms are substituted with either tin or zinc atoms respectively. In the case of the interstitial mechanism, one atom is usually much smaller than the other and can not successfully substitute for the other type of atom in the crystals of the base metal. Instead, the smaller atoms become trapped in the
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