Digital gold mines refer to the latest technology that will make everyone rich. In fact, over the past forty years, America's high-tech companies have indeed made millions of people wealthy.
Cryptocurrencies have been a digital gold mine for some, although their volatility has also been a disaster for others (see
digital gold). The latest digital gold mine is AI, which pundits predict will be the greatest asset creator of all time. See
AI in a nutshell.