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The pair are choosing to remain anonymous, Kagin said, in part to avoid a renewed gold rush to their property by modern-day prospectors armed with metal detectors.

They also don’t want to be treated any differently, said David McCarthy, chief numismatist for Kagin Inc. of Tiburon.

“Their concern was this would change the way everyone else would look at them, and they’re pretty happy with the lifestyle they have today,” he said.

They plan to put most of the coins up for sale through Amazon while holding onto a few keepsakes. They’ll use the money to pay off bills and quietly donate to local charities, Kagin said.

Before they sell them, they are loaning some to the American Numismatic Association for its National Money Show, which opens Thursday in Atlanta.

What makes their find particularly valuable, McCarthy said, is that almost all of the coins are in near-perfect condition. That means that whoever put them into the ground likely socked them away as soon as they were put into circulation.

Because paper money was illegal in California until the 1870s, he added, it’s extremely rare to find any coins from before that of such high quality.

“It wasn’t really until the 1880s that you start seeing coins struck in California that were kept in real high grades of preservation,” he said.

The coins, in $5, $10 and $20 denominations, were stored more or less in chronological order, McCarthy said, with the 1840s and 1850s pieces going into one canister until it was filed, then new coins going into the next one and the next one after that. The dates and the method indicated that whoever put them there was using the ground as their personal bank and that they weren’t swooped up all at once in a robbery.