bitcoin miner argo blockchain plc’s shares are plummeting after the firm announced several measures including issuing stock at a discount to an unnamed investor for 27 million to ease liquidity pressures the londonbased mining company’s american depository receipts fell as much as 13 to 214 on tuesday the adrs have dropped about 47 since the firm announced on friday the issuance of the 87 million common shares or about a 15 stake