Federal Mine Inspector was examining worked out area (2 H Rooms) when he found a cave 1 cross-cut inby spad 1339. Cave extended from R1 across belt to L1. Cave was 50' long by 18' to 50' wide by 5' to 6' high. Area supported by 4' resin bolts on 4' x 4' pattern, cribs, & steel posts. Ventilation not affected. Cave will not be cleaned.