Buffett has always said not to invest in things you don't understand. That's why he was very late investing in for instance Amazon.

The Bitcoin-equivalent of investing in gold mining would be investing in Bitcoin mining. I don't expect that to happen though, it's totally different. A gold mine and the company that owns can expect long-term productivity, whereas a Bitcoin miner sees his hardware quickly become obsolete. It's much more of a continuous gamble on productivity than the stable flow of gold taken out of the ground. Then again, most of my knowledge comes from Gold Rush on the Discovery channel