The human mind is fascinated with anything bright - gold, silver copper; therefore, the metals will keep their value.
If we ever advance beyond our prehistoric predilection for shiny things, that will change.
http://www.youtube.com/watch?v=dvmvu6GxqSg&feature=related
Part 3/3
Indeed. As long as you have electricity, gold, silver, copper, and aluminum will all be worth more than zero.