The reason nobody has answered your question is because you didn't even ask a "question". What central coast? Where in the world? What about gold panning? What about metal detecting? People can't answer a question that isn't asked. Be a litle more specific and you'll probably get an answer.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them