Copper is a good conductor of heat, so it is widely used for electrical wire, telephone wire, and cooking appliances. Copper ore contained in the mountainous Jayawijaya (Papua). Copper is a soft metal. In order to be even harder to be mixed with other metals. A mixture of various metals called alloys. A mixture of copper, tin, and zinc to produce bronze. Bronze is widely used to make gamelan, statues, medals, and craft items. A mixture of copper and zinc to produce brass or pan. Pan used to make door handles and handicrafts.
Aluminium has a rust resistant properties and is very light. Aluminum ore called bauxite. Bauxite are produced from Pulau Bintan and Singkawang. Because of its lightweight, shiny, not easy to rust, easily dissipates heat, and its use is more practical, the aluminum is used to make kitchen utensils such as kettle, pot, and a basket. In addition, aluminum is also used as a raw material for making airplanes.
Nickel ore found in the area Sorowako (Central Sulawesi). Nickel has a rust resistant properties, when polished shiny and attractive. Nickel is used to make tools automobile, bicycle parts, motorcycle wheel, and so on. Goods coated with nickel-called divernikel.
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