Copper has been a valuable and plentiful resource throughout the years for more then industrial applications.
Most useful to us is perhaps an overlap with industrial uses, Copper has an uncanny ability to take whatever energy is present and amplify and direct it. This allows us to harness energies from ourselves or outside forces and while intensifying the energy we can also direct it in a way that is beneficial This makes Copper one of the most useful metals in the world of metaphysics.
Within your body Copper has the ability to balance the flow of energy through your body and aura, your magnetic polarity and assist in proper ph balance within your system. If nothing else a properly aligned body has a much stronger immune system response to any illness or disease, so copper has been used by healers throughout history.