Are these mines close to the power source? Because that can be helpful for them to reduce their expenses in energy consumption. Tesla following this trend won't be possible as they are mainly a car company, maybe Elon might create another mining start up that are more focused on the bitcoin and other related stuff.
Elon is open for possibilities of venturing on other investment option and might they will grab the option to open up a mining farm since its quite good option for them to open that. Remember they have capabilities since they have resources to make this project happen, but lets expect that they will use electric or other cheap methods so I believe they can lessen their operational cost if they can make their mining farm run by solar or other green energy source.
