The study commonly cited is USGS Bulletin 1740-B, but does not cover the Hammond place. It covers an area to the south. That doesn’t mean there are not minerals present on the Hammonds’ land, but it doesn’t mean they are there, either. That would depend on the geology under the Hammond ranch.
Interesting, so there could really be some truth to the rumor?
There was a similar one about the other stand off in Nevada but never heard anything more than rumors on it either.