Mr C- You are right and wrong. The cost of copper is pretty high, compared to most other metals(scrap is fluctuating between $2 & $3 a pound, lately). Thus, grounding/earth rods are available in solid and plated versions: (http://www.krispettlonlightningprotection.com/catalog/grounding.php)
My apologies, in advance, for my cluelessness. Would you please tell me what are you planning to do with a copper "slug" and your power cord? Thanks, Happy Listening
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