Bitcoin miner Marathon Digital has purchased another $249 million worth of Bitcoin after raising $300 million from a senior note offering. On Aug. 14, the miner said it used part of the note sale proceeds to buy around 4,144 Bitcoin (BTC) at an average price of roughly $59,500, which brought its “strategic Bitcoin reserve to over 25,000 BTC,” it added on X. Marathon saw net proceeds of around $292.5 million for its convertible senior notes due September 2031, which bear a 2.125% annual interest rate and are convertible into cash, Marathon stock, or both. Marathon said the remaining cash from t…