There is definitely Gold and Copper those I can see with my eyes. This site has a breakdown of random circuitboards (could be from iPod's cellphones, toasters... and computers but it has a database of many metals as found in discarded circuitboards in pounds per ton: http://www.thegreenpc.com/the.htm
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One mineral that is used in computers is gold. Gold makes info transfer from one conductor to another. Its is easy to is in wiring and melt to make it many shapes and sizes.
Silicon is the best known, which is used primarily in the CPU. Copper is another important one, since it is used to carry almost all electric impulses.