The extent of the mining sector’s exposure to crypto-friendly Signature Bank is unclear. Marathon Digital Holdings (MARA) on Monday said it still had access to $142 million in deposits the now-shuttered lender. CleanSpark (CLSK), Bitfarms (BITF) and Argo Blockchain (ARBK) said on Monday they have no exposure to either Signature or the other collapsed banks, Silvergate and SVB.