Employee reported on 5/6/25 that they had injured their back the previous day (5/5/25) while clearing a blockage of 5-8"" stones over a small transfer hopper. We immediately filed a WC claim and directed EE to seek medical attention. Miner returned on 5/7 saying back was fine but could not produce Dr's note clearing them to work. EE has not supplied a Dr's note as of 5/14/25.