The first gold claims on Alkai Point were posted by the Denny Party. They soon found that the gold content was too low to be worth mining. Just because gold is found almost everywhere, that doesn't mean it can be practical to recover it.
In August of 1970 another person tried to file claims on the beach (which is public property!):
In August of 1970 another person tried to file claims on the beach (which is public property!):