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Elo comments on Magnetic rings (the most mediocre superpower) A review. - Less Wrong Discussion
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Comments (33)
To form eddy currents you need enough metal in which to form them. If you have ever seen the experiment with the pipe above - vs the same with a slit in the pipe to lower the number of currents that can form - there is a considerable loss of currents forming.
Compared to natural ores - to be able to produce currents that can be felt is going to be difficult.
I have a few iron ore rocks that midly stick the the rings. but they barely support their own mass against gravity.
Gold comes mostly in elementary gold particles, nuggets. That's why it's probably possible to fish it this way. (Perhaps a few people do just that and don't talk too much about it from obvious reasons.)
Its possible. Seems like too much effort to get anything of worth.