Crypto mining has been hit hard by the falling price of bitcoin and other tokens, as well as high energy costs, as a large surplus of bitcoin mining machines has been idled, CoinDesk reported. According to a conversation between Matt Schult, executive chairman of Bitcoin mining company CleanSpark (CLSK), and analysts, it is estimated that in the United States alone, there are still 250,000 to 500,000 mining machines that are sealed and idle. Ethan Vera, chief operating officer of mining services company Luxor Technologies, put the global figure at 276,000 units in September. Mining firm Core Scientific has raised its custody fees by 20 percent to 25 percent in recent months, according to people familiar with the matter.