Miner was operating the CAT 349F excavator approx 25-30' from an approx 42' highwall when it sloughed causing material to cave-in the bottom and top windshield allowing material to enter the cab trapping miner for <30mins. Miner made distress radio call and miners immediately began removing miner from cab. MSHA was notified <15mins. Miner received medical care on 10/4.