AN UNINTENTIONAL ROOF FALL OCCURRED ON THE #4 7TH SOUTH SUBMAIN CROSSCUT 4 TO 5 AT 6633 EAST. THE FALL WAS APPROXIMATELY 90 FEET LONG, APPROXIMATELY 19 FEET WIDE AND APPROXIMATELY 6 - 12 FEET THICK. THE FALL DID NOT AFFECT PASSAGE OF MINERS. THE FALL WILL BE CLEANED UP. FALL #18T.